Performance information

• Braiding Operations for a Topological Josephson Junction Array Using a Bipolar Current Pulse Generator Controlled by SFQ Logic Circuits
  Hiroaki Myoren; Takuro Funazawa; Kitaru Oba; Yuki Shimizu; Masato Naruse
  IEEE Transactions on Applied Superconductivity, Volume：34, Number：3, First page：1, Last page：6, May 2024
  Institute of Electrical and Electronics Engineers (IEEE), Scientific journal
  DOI：https://doi.org/10.1109/tasc.2024.3372865
  DOI ID：10.1109/tasc.2024.3372865, ISSN：1051-8223, eISSN：1558-2515
• Configuration of Probe Tones for MKID Readout with Frequency Sweeping Scheme
  M. Nagai; Y. Murayama; T. Nitta; R. Suzuki; R. Hikawa; H. Miyazawa; R. Noji; H. Kiuchi; Y. Sekimoto; H. Matsuo; W. Shan; M. Naruse; T. Noguchi; N. Kuno; A. Monfardini; J. Macias-Perez; J. Goupy; M. Calvo; A. Catalano
  Journal of Low Temperature Physics, Volume：209, Number：3-4, First page：677, Last page：685, Sep. 2022
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10909-022-02865-y
  DOI ID：10.1007/s10909-022-02865-y, ISSN：0022-2291, eISSN：1573-7357
• Braiding Operations for a Topological Josephson Junction Array using SFQ Current Pulses
  Takuro Funazawa; Masato Naruse; Hiroaki Myoren
  Journal of Physics: Conference Series, Volume：2323, Number：1, First page：012035, Last page：012035, Aug. 2022
  Abstract
  
  Majorana bound states (MBSs) can occur in topological Josephson junction (JJ) arrays with the presence of a fractional vortex with 2π-phase winding. It has been theoretically shown that the braiding operation can be achieved by using current pulses, compatible with single flux quantum (SFQ) technology. Therefore, we designed an SFQ logic circuit for the braiding operations of the topological JJ array using single flux quanta in a conventional JJ array. Braiding operations could be realized by an SFQ logic circuit with double flux quantum driver. To obtain positive and negative current pulses using the SFQ logic circuit, we used SFQ logic circuits with ac biasing for simulation. Finally, we confirmed the CNOT operation using an array-type SFQ circuit by means of simulation and estimated the CNOT operation speed.
  IOP Publishing, Scientific journal
  DOI：https://doi.org/10.1088/1742-6596/2323/1/012035
  DOI ID：10.1088/1742-6596/2323/1/012035, ISSN：1742-6588, eISSN：1742-6596
• SPICA Mid-infrared Instrument (SMI): The latest design and specifications　　　　　　　　　　　　　　　
  Takehiko Wada; Hidehiro Kaneda; Takuma Kokusho; Toyoaki Suzuki; Kumiko Morihana; Takurou Tsuchikawa; Yuki Kuroda; Daichi Ishikawa; Shinki Oyabu; Naoki Isobe; Daisuke Ishihara; Hideo Matsuhara; Koichi Nagase; Takao Nakagawa; Takafumi Ootsubo; Mitsuyoshi Yamagishi; Hiroshi Maeshima; Shunsuke Onishi; Kosei Matsumoto; Satoshi Itoh; Mizuho Uchiyama; Ryan Lau; Hiromichi Ebihara; Hanae Inami; Koji Kawabata; Yasumasa Kasaba; Takeshi Sakanoi; Yoshifusa Ita; Masayuki Akiyama; Itsuki Sakon; Takafumi Kamizuka; Takashi Miyata; Kohji Tsumura; Masato Naruse; Youichi Ohyama; Shiang-Yu Wang; Hiroshi Shibai
  SPACE TELESCOPES AND INSTRUMENTATION 2020: OPTICAL, INFRARED, AND MILLIMETER WAVE, Volume：11443, 2021
  SMI (SPICA Mid-infrared Instrument) is one of the three focal-plane science instruments for SPICA. SMI is the Japanese-led instrument proposed and managed by a university consortium. SMI covers the wavelength range from 10 to 36 mu m with four separate channels: the low-resolution (R = 60 - 160) spectroscopy function for 17 - 36 mu m, the broad-band (R = 5) imaging function at 34 mu m, the mid-resolution (R = 1400 - 2600) spectroscopy function for 18 - 36 mu m, and the high-resolution (R = 29000) spectroscopy function for 10 - 18 mu m. In this presentation, we will show the latest design and specifications of SMI as a result of feasibility studies.
  SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
  DOI：https://doi.org/10.1117/12.2561157
  DOI ID：10.1117/12.2561157, ISSN：0277-786X, eISSN：1996-756X, Web of Science ID：WOS:000646193100090
• GroundBIRD : A CMB polarization experiment with MKID arrays　　　　　　　　　　　　　　　
  Kyungmin Lee; Jihoon Choi; Ricardo Tanausú Génova-Santos; Makoto Hattori; Masashi Hazumi; Shunsuke Honda; Takuji Ikemitsu; Hidesato Ishida; Hikaru Ishitsuka; Yonggil Jo; Kenichi Karatsu; Kenji Kiuchi; Junta Komine; Ryo Koyano; Hiroki Kutsuma; Satoru Mima; Makoto Minowa; Joonhyeok Moon; Makoto Nagai; Taketo Nagasaki; Masato Naruse; Shugo Oguri; Chiko Otani; Michael Peel; Rafael Rebolo; José Alberto Rubiño-Martín; Yutaro Sekimoto; Junya Suzuki; Tohru Taino; Osamu Tajima; Nozomu Tomita; Tomohisa Uchida; Eunil Won; Mitsuhiro Yoshida
  Journal of Low Temperature Physics, Volume：200, Number：5-6, First page：384, Last page：391, Nov. 2020
  GroundBIRD is a ground-based experiment for the precise observation of the
  polarization of the cosmic microwave background (CMB). To achieve high
  sensitivity at large angular scale, we adopt three features in this experiment:
  fast rotation scanning, microwave kinetic inductance detector (MKID) and cold
  optics. The rotation scanning strategy has the advantage to suppress $1/f$
  noise. It also provides a large sky coverage of 40\%, which corresponds to the
  large angular scales of $l \sim 6$. This allows us to constrain the
  tensor-to-scalar ratio by using low $l$ B-mode spectrum. The focal plane
  consists of 7 MKID arrays for two target frequencies, 145 GHz and 220 GHz band.
  There are 161 pixels in total, of which 138 are for 144 GHz and 23 are for 220
  GHz. This array is currently under development and the prototype will soon be
  evaluated in telescope. The GroundBIRD telescope will observe the CMB at the
  Teide observatory. The telescope was moved from Japan to Tenerife and is now
  under test. We present the status and plan of the GroundBIRD experiment.
  Scientific journal
  DOI：https://doi.org/10.1007/s10909-020-02511-5
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85089449833&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85089449833&origin=inward
  DOI ID：10.1007/s10909-020-02511-5, ISSN：0022-2291, eISSN：1573-7357, arXiv ID：arXiv:2011.07705, SCOPUS ID：85089449833
• Development of embedded STJ for large format array X-ray detector　　　　　　　　　　　　　　　
  Y. Ito; M. Aoyagi; C. Otani; M. Naruse; H. Myoren; T. Taino
  Journal of Physics: Conference Series, Volume：1590, Number：1, Jul. 2020
  We have been developing an embedded superconducting tunnel junction (e-STJ) for a large-format array X-ray detector. Compared with the conventional STJ array, the e-STJ array is suitable for enlarging the detection area effectively because the e-STJ detector utilizes a three-dimensional packaging technology. To investigate the relationship between the fabrication method and the electric characteristics of the e-STJ, we designed and fabricated three types of simplified e-STJ and measured their subgap leakage current in the temperature range from 4.2 K to 0.3 K. We found that the roughness of the embedding hole on the Si substrate and the contact part between the embedded STJ and the side of the embedding hole affected the subgap leakage current.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1590/1/012035
  DOI ID：10.1088/1742-6596/1590/1/012035, ISSN：1742-6596, SCOPUS ID：85090054199
• Performance of Digital SQUID with Sub-Flux Quantum Feedback Resolution Fabricated using 10 kA/cm2 Nb Process　　　　　　　　　　　　　　　
  Kohki Itagaki; Itta Oshima; Yuichi Hasegawa; Ryo Matsunawa; Masato Naruse; Tohru Taino; Hiroaki Myoren
  Journal of Physics: Conference Series, Volume：1590, Number：1, Jul. 2020
  Digital superconducting quantum interference device (SQUID with Single Flux Quantum (SFQ) feedback operates as a Δ-type oversampling A/D converter. Magnetic flux resolution at Nyquist frequency can be improved by taking sub SFQ feedback resolution and large oversampling ratio. Using high critical current density Nb process for fabricating SFQ circuits, we expected more higher operation speed for the digital SQUID and resulting to higher magnetic flux resolutions. We expected a performance of the digital SQUID magnetometer fabricated using 10 kA/cm2 Nb process based on CAD layout, with an up/down counter using T2FF cells and parallel SFQ feedback. For the clock frequency of 13 GHz and the Nyquist frequency of 1.587 MHz, the magnetic field noise was lower than and the slew rate was exceeded 500 mT/s.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1590/1/012038
  DOI ID：10.1088/1742-6596/1590/1/012038, ISSN：1742-6596, SCOPUS ID：85090055283
• Implementation of Interface Circuit for Digital SQUID with Sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  Ryo Matsunawa; Kohki Itagaki; Itta Oshima; Yuichi Hasegawa; Masato Naruse; Tohru Taino; Hiroaki Myoren
  Journal of Physics: Conference Series, Volume：1590, Number：1, Jul. 2020
  Digital SQUIDs with single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. To achieve a higher resolution, we studied a digital SQUID with sub-flux quantum feedback. We studied implementation methods for an interface circuit by considering the circuit size, power consumption and signal processing to achieve high-resolution and highspeed operation of the digital SQUID magnetometer. Assuming the decimation filter and the up/down counter implemented on a FPGA board, a 1-bit to 16-bit deserializer with an output frequency of 500 MHz could be used for the interface circuit. The circuit scale was 1940 μm × 1720 μm, and the bias current was 302 mA. From the simulation results, a sufficient wide bias margin could be obtained up to 30 GHz.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1590/1/012039
  DOI ID：10.1088/1742-6596/1590/1/012039, ISSN：1742-6596, SCOPUS ID：85090039896
• Niobium-Based Kinetic Inductance Detectors for High-Energy Applications
  Masato NARUSE; Masahiro KUWATA; Tomohiko ANDO; Yuki WAGA; Tohru TAINO; Hiroaki MYOREN
  IEICE Transactions on Electronics, Volume：E103.C, Number：5, First page：204, Last page：211, May 2020
  Institute of Electronics, Information and Communications Engineers (IEICE), Scientific journal
  DOI：https://doi.org/10.1587/transele.2019sei0001
  DOI ID：10.1587/transele.2019sei0001, ISSN：0916-8524, eISSN：1745-1353
• Superconducting Resonators with Niobium and $${\mathrm{YBa}_{2}\mathrm{Cu}_{3}O_{7-{\delta } } }$$ for Alpha-Particle Detectors
  M. Naruse; T. Ando; Y. Waga; R. Kubota; S. Mima; C. Otani; T. Taino; H. Myoren
  Journal of Low Temperature Physics, Volume：199, Number：3-4, First page：614, Last page：621, May 2020
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10909-020-02373-x
  DOI ID：10.1007/s10909-020-02373-x, ISSN：0022-2291, eISSN：1573-7357
• Niobium-Based Kinetic Inductance Detectors for High-Energy Applications　　　　　　　　　　　　　　　
  Masato Naruse; Masahiro Kuwata; Tomohiko Ando; Yuki Waga; Tohru Taino; Hiroaki Myoren
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E103C, Number：5, First page：204, Last page：211, May 2020
  A lumped element kinetic inductance detector (LeKID) relying on a superconducting resonator is a promising candidate for sensing high energy particles such as neutrinos, X-rays, gamma-rays, alpha particles, and the particles found in the dark matter owing to its large-format capability and high sensitivity. To develop a high energy camera, we formulated design rules based on the experimental results from niobium (Nb)-based LeKIDs at 1 K irradiated with alpha-particles of 5.49 MeV. We defined the design rules using the electromagnetic simulations for minimizing the crosstalk. The neighboring pixels were fixed at 150 mu m with a frequency separation of 250 MHz from each other to reduce the crosstalk signal as low as the amplifier-limited noise level. We examined the characteristics of the Nb-based resonators, where the signal decay time was controlled in the range of 0.5-50 mu s by changing the designed quality factor of the detectors. The amplifier noise was observed to restrict the performance of our device, as expected. We improved the energy resolution by reducing the filling factor of inductor lines. The best energy resolution of 26 for the alpha particle of 5.49 MeV was observed in our device.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  DOI：https://doi.org/10.1587/transele.2019SEI0001
  DOI ID：10.1587/transele.2019SEI0001, ISSN：1745-1353, Web of Science ID：WOS:000530666500003
• Resonance Spectra of Coplanar Waveguide MKIDs Obtained Using Frequency Sweeping Scheme
  M. Nagai; Y. Murayama; T. Nitta; H. Kiuchi; Y. Sekimoto; H. Matsuo; W. Shan; M. Naruse; T. Noguchi
  Journal of Low Temperature Physics, Volume：199, Number：1-2, First page：250, Last page：257, Apr. 2020
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10909-019-02262-y
  DOI ID：10.1007/s10909-019-02262-y, ISSN：0022-2291, eISSN：1573-7357
• DESHIMA on ASTE: On-Sky Responsivity Calibration of the Integrated Superconducting Spectrometer　　　　　　　　　　　　　　　
  Tatsuya Takekoshi; Kenichi Karatsu; Junya Suzuki; Yoichi Tamura; Tai Oshima; Akio Taniguchi; Shin'ichiro Asayama; Tom J. L. C. Bakx; Jochem J. A. Baselmans; Sjoerd Bosma; Juan Bueno; Kah Wuy Chin; Yasunori Fujii; Kazuyuki Fujita; Robert Huiting; Soh Ikarashi; Tsuyoshi Ishida; Shun Ishii; Ryohei Kawabe; Teun M. Klapwijk; Kotaro Kohno; Akira Kouchi; Nuria Llombart; Jun Maekawa; Vignesh Murugesan; Shunichi Nakatsubo; Masato Naruse; Kazushige Ohtawara; Alejandro Pascual Laguna; Koyo Suzuki; David J. Thoen; Takashi Tsukagoshi; Tetsutaro Ueda; Pieter J. de Visser; Paul P. van der Werf; Stephen J. C. Yates; Yuki Yoshimura; Ozan Yurduseven; Akira Endo
  JOURNAL OF LOW TEMPERATURE PHYSICS, Volume：199, Number：1-2, First page：231, Last page：239, Apr. 2020
  We are developing an ultra-wideband spectroscopic instrument, DESHIMA (DEep Spectroscopic HIgh-redshift MApper), based on the technologies of an on-chip filter bank and microwave kinetic inductance detector (MKID) to investigate dusty starburst galaxies in the distant universe at millimeter and submillimeter wavelengths. An on-site experiment of DESHIMA was performed using the ASTE 10-m telescope. We established a responsivity model that converts frequency responses of the MKIDs to line-of-sight brightness temperature. We estimated two parameters of the responsivity model using a set of skydip data taken under various precipitable water vapor (PWV 0.4-3.0 mm) conditions for each MKID. The line-of-sight brightness temperature of sky is estimated using an atmospheric transmission model and the PWVs. As a result, we obtain an average temperature calibration uncertainty of 1 sigma=4, which is smaller than other photometric biases. In addition, the average forward efficiency of 0.88 in our responsivity model is consistent with the value expected from the geometrical support structure of the telescope. We also estimate line-of-sight PWVs of each skydip observation using the frequency response of MKIDs and confirm the consistency with PWVs reported by the Atacama Large Millimeter/submillimeter Array.
  SPRINGER/PLENUM PUBLISHERS, English, Scientific journal
  DOI：https://doi.org/10.1007/s10909-020-02338-0
  DOI ID：10.1007/s10909-020-02338-0, ISSN：0022-2291, eISSN：1573-7357, Web of Science ID：WOS:000510367900006
• Development of 109-pixel NbTiN-Al MKID array for the 100-GHz band astronomical observations　　　　　　　　　　　　　　　
  Y. Murayama; T. Nitta; M. Nagai; R. Hikawa; R. Suzuki; W. Shan; H. Matsuo; A. Miyachi; M. Kroug; S. Ezaki; Y. Sekimoto; T. Noguchi; M. Naruse; N. Kuno; N. Nakai
  Proceedings of the 31st Symposium on Space Terahertz Technology, ISSTT 2020, First page：116, 2020
  International conference proceedings
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85108990810&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85108990810&origin=inward
  SCOPUS ID：85108990810
• On-site performance of GroundBIRD, a CMB polarization telescope for large angular scale observations　　　　　　　　　　　　　　　
  Shunsuke Honda; Jihoon Choi; Ricardo Tanausu Génova-Santos; Makoto Hattori; Masashi Hazumi; Takuji Ikemitsu; Hidesato Ishida; Hikaru Ishitsuka; Yonggil Jo; Kenichi Karatsu; Kenji Kiuchi; Junta Komine; Ryo Koyano; Hiroki Kutsuma; Kyungmin Lee; Satoru Mima; Makoto Minowa; Joonhyeok Moon; Makoto Nagai; Takeo Nagasaki; Masato Naruse; Shugo Oguri; Chiko Otani; Michael Peel; Rafael Rebolo-López; José Alberto Rubiño-Martín; Yutaro Sekimoto; Yoshinori Sueno; Junya Suzuki; Tohru Taino; Osamu Tajima; Nozomu Tomita; Yuta Tsuji; Tomohisa Uchida; Eunil Won; Mitsuhiro Yoshida
  Proceedings of SPIE - The International Society for Optical Engineering, Volume：11445, 2020
  © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. GroundBIRD is a millimeter-wave telescope to observe the polarization patterns of the cosmic microwave background (CMB). The target science topics are primordial gravitational waves from cosmic inflation and reionization optical depth. Therefore, this telescope is designed to achieve the highest sensitivity at large angular scales, ℓ = 6 - 300. For wide sky observations (∼40% full-sky), scanning at a high rotation speed (120°/s) is important to remove atmospheric fluctuations. Microwave kinetic inductance detector (MKID) is utilized with the fast GroundBIRD rotation since its good time response. We have started the commissioning run at the Teide Observatory in the Canary Islands. We report the performance of the telescope, receiver, and data acquisition system, including cooling achievements, observations of astronomical objects, and observations taken during several days ahead of our main survey observations.
  International conference proceedings
  DOI：https://doi.org/10.1117/12.2560918
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85099787475&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85099787475&origin=inward
  DOI ID：10.1117/12.2560918, ISSN：0277-786X, eISSN：1996-756X, SCOPUS ID：85099787475
• High-Resolution Digital SQUID Magnetometer using Sub-Flux Quantum Feedback　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kosuke Okabe; Ryo Matsunawa; Kohki Itagaki; Masato Naruse; Tohru Taino
  14TH EUROPEAN CONFERENCE ON APPLIED SUPERCONDUCTIVITY (EUCAS2019), Volume：1559, 2020
  Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate for digital magnetometers. In order to realize higher resolution, we have studied a digital SQUID with sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. In this study, we discuss the method of multi-flux quantum generation and compact design of the SFQ up/down counter for high-speed operation of the digital SQUID magnetometer.
  IOP PUBLISHING LTD, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/1559/1/012013
  DOI ID：10.1088/1742-6596/1559/1/012013, ISSN：1742-6588, eISSN：1742-6596, Web of Science ID：WOS:000558737600013
• First light demonstration of the integrated superconducting spectrometer　　　　　　　　　　　　　　　
  Akira Endo; Kenichi Karatsu; Yoichi Tamura; Tai Oshima; Akio Taniguchi; Tatsuya Takekoshi; Shin'ichiro Asayama; Tom J. L. C. Bakx; Sjoerd Bosma; Juan Bueno; Kah Wuy Chin; Yasunori Fujii; Kazuyuki Fujita; Robert Huiting; Soh Ikarashi; Tsuyoshi Ishida; Shun Ishii; Ryohei Kawabe; Teun M. Klapwijk; Kotaro Kohno; Akira Kouchi; Nuria Llombart; Jun Maekawa; Vignesh Murugesan; Shunichi Nakatsubo; Masato Naruse; Kazushige Ohtawara; Alejandro Pascual Laguna; Junya Suzuki; Koyo Suzuki; David J. Thoen; Takashi Tsukagoshi; Tetsutaro Ueda; Pieter J. de Visser; Paul P. van der Werf; Stephen J. C. Yates; Yuki Yoshimura; Ozan Yurduseven; Jochem J. A. Baselmans
  NATURE ASTRONOMY, Volume：3, Number：11, First page：989, Last page：996, Nov. 2019
  Ultra-wideband, three-dimensional (3D) imaging spectrometry in the millimeter-submillimeter (mm-submm) band is an essential tool for uncovering the dust-enshrouded portion of the cosmic history of star formation and galaxy evolution(1-3). However, it is challenging to scale up conventional coherent heterodyne receivers(4) or free-space diffraction techniques(5) to sufficient bandwidths (>= 1 octave) and numbers of spatial pixels(2,3) (>10(2)). Here, we present the design and astronomical spectra of an intrinsically scalable, integrated superconducting spectrometer(6), which covers 332-377 GHz with a spectral resolution of F/Delta F similar to 380. It combines the multiplexing advantage of microwave kinetic inductance detectors (MKIDs)(7) with planar superconducting filters for dispersing the signal in a single, small superconducting integrated circuit. We demonstrate the two key applications for an instrument of this type: as an efficient redshift machine and as a fast multi-line spectral mapper of extended areas. The line detection sensitivity is in excellent agreement with the instrument design and laboratory performance, reaching the atmospheric foreground photon noise limit on-sky. The design can be scaled to band-widths in excess of an octave, spectral resolution up to a few thousand and frequencies up to similar to 1.1 THz. The miniature chip footprint of a few cm(2) allows for compact multi-pixel spectral imagers, which would enable spectroscopic direct imaging and large-volume spectroscopic surveys that are several orders of magnitude faster than what is currently possible(1-3).
  NATURE PUBLISHING GROUP, English, Scientific journal
  DOI：https://doi.org/10.1038/s41550-019-0850-8
  DOI ID：10.1038/s41550-019-0850-8, ISSN：2397-3366, Web of Science ID：WOS:000496474000013
• Design of Digital Filter for Digital SQUID With Sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kousuke Okabe; Ryo Matsunawa; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：29, Number：5, Aug. 2019
  Digital SQUIDs with the single flux quantum (SFQ) feedback have attracted much attention because of the feasibility of realizing a wide dynamic range and high slew rate. In order to realize higher resolution, we have studied the performance of an advanced, digital SQUID configuration offering sub-flux quantum feedback. Combining the sub-flux quantum feedback to a feedback loop and the direct SFQ feedback to a main loop triggered by carry SFQ pulses from an up/down counter. After optimization of the circuit, we confirmed the maximum magnetic field amplitude exceed 1 mu T, the magnetic field noise is lower than 100 pT/root Hz with a signal band frequency of 1.22 MHz. Using a first-order sinc filter, we could implement the digital SQUID magnetometer at low-temperature with reasonable noise reduction performance and the binary data rate reduction in order to transfer the data from low temperature circuit to the room temperature electronics.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2019.2908625
  DOI ID：10.1109/TASC.2019.2908625, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000467071300001
• Wideband on-chip terahertz spectrometer based on a superconducting filterbank　　　　　　　　　　　　　　　
  Akira Endo; Kenichi Karatsu; Alejandro Pascual Laguna; Behnam Mirzaei; Robert Huiting; David J. Thoen; Vignesh Murugesan; Stephen J. C. Yates; Juan Bueno; Nuri van Marrewijk; Sjoerd Bosma; Ozan Yurduseven; Nuria Llombart; Junya Suzuki; Masato Naruse; Pieter J. de Visser; Paul P. van der Werf; Teun M. Klapwijk; Jochem J. A. Baselmans
  JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS, Volume：5, Number：3, Jul. 2019
  Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science, and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled to a transmission line filterbank, with a microwave kinetic inductance detector behind each filter. Using frequency division multiplexing, all detectors are read-out simultaneously, creating a wide-band spectrometer with an instantaneous bandwidth of 45 GHz centered around 350 GHz. The spectrometer has a spectral resolution of F/Delta F = 380 and reaches photon-noise limited sensitivity. We discuss the chip design and fabrication, as well as the system integration and testing. We confirm full system operation by the detection of an emission line spectrum of methanol gas. The proposed concept allows for spectroscopic radiation detection over large bandwidths and resolutions up to F/Delta F similar to 1000, all using a chip area of a few cm(2). This will allow the construction of medium resolution imaging spectrometers with unprecedented speed and sensitivity. (C) The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License.
  SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS, English, Scientific journal
  DOI：https://doi.org/10.1117/1.JATIS.5.3.035004
  DOI ID：10.1117/1.JATIS.5.3.035004, ISSN：2329-4124, eISSN：2329-4221, Web of Science ID：WOS:000489023400008
• High Sensitivity Photon Sensors Relying on Superconducting Micro Resonators
  Masato NARUSE; Tomohiko ANDO; Ritsuki KUBOTA; Masahiro KUWATA; Tohru TAINO; Hiroaki MYOREN
  TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan), Volume：54, Number：3, First page：174, Last page：180, May 2019
  Cryogenic Association of Japan, Scientific journal
  DOI：https://doi.org/10.2221/jcsj.54.174
  DOI ID：10.2221/jcsj.54.174, ISSN：0389-2441, eISSN：1880-0408
• Design of on-chip broadband band selection filter for multi-chroic mm/submm Camera　　　　　　　　　　　　　　　
  Kah Wuy Chin; Tai Ohshima; Satoshi Ono; Takeshi Sakai; Tatsuya Takekoshi; Satoru Mima; Ryohei Kawabe; Masato Naruse; Keisuke Yoshioka; Shinsuke Uno
  ISSTT 2019 - 30th International Symposium on Space Terahertz Technology, Proceedings Book, First page：99, 2019
  International Symposium on Space Terahertz Technology, English, International conference proceedings
  SCOPUS ID：85088356441
• The LiteBIRD Satellite Mission: Sub-Kelvin Instrument　　　　　　　　　　　　　　　
  A. Suzuki; P. A.R. Ade; Y. Akiba; D. Alonso; K. Arnold; J. Aumont; C. Baccigalupi; D. Barron; S. Basak; S. Beckman; J. Borrill; F. Boulanger; M. Bucher; E. Calabrese; Y. Chinone; S. Cho; B. Crill; A. Cukierman; D. W. Curtis; T. de Haan; M. Dobbs; A. Dominjon; T. Dotani; L. Duband; A. Ducout; J. Dunkley; J. M. Duval; T. Elleflot; H. K. Eriksen; J. Errard; J. Fischer; T. Fujino; T. Funaki; U. Fuskeland; K. Ganga; N. Goeckner-Wald; J. Grain; N. W. Halverson; T. Hamada; T. Hasebe; M. Hasegawa; K. Hattori; M. Hattori; L. Hayes; M. Hazumi; N. Hidehira; C. A. Hill; G. Hilton; J. Hubmayr; K. Ichiki; T. Iida; H. Imada; M. Inoue; Y. Inoue; K. D. Irwin; H. Ishino; O. Jeong; H. Kanai; D. Kaneko; S. Kashima; N. Katayama; T. Kawasaki; S. A. Kernasovskiy; R. Keskitalo; A. Kibayashi; Y. Kida; K. Kimura; T. Kisner; K. Kohri; E. Komatsu; K. Komatsu; C. L. Kuo; N. A. Kurinsky; A. Kusaka; A. Lazarian; A. T. Lee; D. Li; E. Linder; B. Maffei; A. Mangilli; M. Maki; T. Matsumura; S. Matsuura; D. Meilhan; S. Mima; Y. Minami; K. Mitsuda; L. Montier; M. Nagai; T. Nagasaki; R. Nagata; M. Nakajima; S. Nakamura; T. Namikawa; M. Naruse; H. Nishino; T. Nitta; T. Noguchi; H. Ogawa; S. Oguri
  Journal of Low Temperature Physics, Volume：193, Number：5-6, First page：1048, Last page：1056, Dec. 2018, [Reviewed]
  Inflation is the leading theory of the first instant of the universe. Inflation, which postulates that the universe underwent a period of rapid expansion an instant after its birth, provides convincing explanation for cosmological observations. Recent advancements in detector technology have opened opportunities to explore primordial gravitational waves generated by the inflation through “B-mode” (divergent-free) polarization pattern embedded in the cosmic microwave background anisotropies. If detected, these signals would provide strong evidence for inflation, point to the correct model for inflation, and open a window to physics at ultra-high energies. LiteBIRD is a satellite mission with a goal of detecting degree-and-larger-angular-scale B-mode polarization. LiteBIRD will observe at the second Lagrange point with a 400 mm diameter telescope and 2622 detectors. It will survey the entire sky with 15 frequency bands from 40 to 400 GHz to measure and subtract foregrounds. The US LiteBIRD team is proposing to deliver sub-Kelvin instruments that include detectors and readout electronics. A lenslet-coupled sinuous antenna array will cover low-frequency bands (40–235 GHz) with four frequency arrangements of trichroic pixels. An orthomode-transducer-coupled corrugated horn array will cover high-frequency bands (280–402 GHz) with three types of single frequency detectors. The detectors will be made with transition edge sensor (TES) bolometers cooled to a 100 milli-Kelvin base temperature by an adiabatic demagnetization refrigerator. The TES bolometers will be read out using digital frequency multiplexing with Superconducting QUantum Interference Device (SQUID) amplifiers. Up to 78 bolometers will be multiplexed with a single SQUID amplifier. We report on the sub-Kelvin instrument design and ongoing developments for the LiteBIRD mission.
  Scientific journal
  DOI：https://doi.org/10.1007/s10909-018-1947-7
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85046704580&origin=inward
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  DOI ID：10.1007/s10909-018-1947-7, ISSN：0022-2291, eISSN：1573-7357, SCOPUS ID：85046704580
• GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs　　　　　　　　　　　　　　　
  T. Nagasaki; J. Choi; R. T. Génova-Santos; M. Hattori; M. Hazumi; H. Ishitsuka; K. Karatsu; K. Kikuchi; R. Koyano; H. Kutsuma; K. Lee; S. Mima; M. Minowa; M. Nagai; M. Naruse; S. Oguri; C. Otani; R. Rebolo; J. A. Rubiño-Martín; Y. Sekimoto; M. Semoto; J. Suzuki; T. Taino; O. Tajima; N. Tomita; T. Uchida; E. Won; M. Yoshida
  Journal of Low Temperature Physics, Volume：193, Number：5-6, First page：1066, Last page：1074, Dec. 2018
  Cosmic microwave background (CMB) radiation is an afterglow from the Big Bang. CMB contains rich information about the early stage of the universe. In particular, odd-parity patterns (B-mode) in the CMB polarization on a large angular scale would provide an evidence of the cosmic inflation. The aim of the GroundBIRD experiment is to observe the B-mode on large angular scales from the ground. One of the most novel characteristics of the telescope used for this experiment is its rapid rotational scanning technique. In addition, the telescope uses cold optics and microwave kinetic inductance detectors. We have developed a telescope mount with a three-axis rotation mechanism (azimuth, elevation, and boresight) and measured the vibration at the focal plane stage at 20 RPM scan rotation rate. We also performed focal plane detector tests on this mount. The tests confirmed the expected response from the geomagnetism associated with the mount rotation. We have also developed a design for the magnetic shields and a detector array on a 3-in wafer. The preparations to begin the observations at the Teide Observatory in the Canary Islands in 2018 are proceeding smoothly.
  Scientific journal
  DOI：https://doi.org/10.1007/s10909-018-2077-y
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85055998053&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85055998053&origin=inward
  DOI ID：10.1007/s10909-018-2077-y, ISSN：0022-2291, eISSN：1573-7357, SCOPUS ID：85055998053
• Design, Fabrication and Measurement of Pyramid-Type Antireflective Structures on Columnar Crystal Silicon Lens for Millimeter-Wave Astronomy
  T. Nitta; Y. Sekimoto; T. Hasebe; K. Noda; S. Sekiguchi; M. Nagai; S. Hattori; Y. Murayama; H. Matsuo; A. Dominjon; W. Shan; M. Naruse; N. Kuno; N. Nakai
  Journal of Low Temperature Physics, Volume：193, Number：5-6, First page：976, Last page：983, Dec. 2018
  Springer Science and Business Media LLC, Scientific journal
  DOI：https://doi.org/10.1007/s10909-018-2047-4
  DOI ID：10.1007/s10909-018-2047-4, ISSN：0022-2291, eISSN：1573-7357
• Readout Circuit Based on Single-Flux-Quantum Logic Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  Hiroaki Myoren; Satoshi Denda; Kazuki Ota; Masato Naruse; Tohru Taino; Lin Kang; Jian Chen; Peiheng Wu
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：28, Number：4, Jun. 2018
  A read-out circuit for photon-number-resolving superconducting nanowire single-photon detector (SNSPD) based on the single-flux-quantum (SFQ) circuit was designed and the basic performance of the fabricated circuit was confirmed. The current pulse output from an SNSPD array was converted to a SFQ pulse. The SFQ pulse triggered two stacks of double-flux-quantum (DFQ) amplifiers. A single block of a 40-series DFQ amplifier (DFQA) generated 2.3-mV voltage with a rising time of 400 ps for an operation frequency of 1.25 GHz, and the two stacks of DFQA generated 4.6-mV voltage when the SFQ pulse trains supplied both the DFQAs. The total voltage generated by twelve-series of 40-series DFQAs was expected to be 27.6 mV, with the same rising time of 400 ps. Using the fabricated circuit, the 40-series DFQA and the two stacks of the 40-series DFQA generated 2.3- and 4.6-mV voltage, respectively. The output voltage of the SFQ readout circuit was compatible to a room-temperature photon counter with a wide-band low-noise amplifier operating at low temperature.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2018.2809483
  DOI ID：10.1109/TASC.2018.2809483, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000431524600001
• Status of the GroundBIRD Telescope　　　　　　　　　　　　　　　
  J. Choi; R. Génova-Santos; M. Hattori; M. Hazumi; H. Ishitsuka; F. Kanno; K. Karatsu; K. Kiuchi; R. Koyano; H. Kutsuma; K. Lee; S. Mima; M. Minowa; M. Nagai; T. Nagasaki; M. Naruse; S. Oguri; T. Okada; C. Otani; R. Rebolo; J. Rubiño-Martín; Y. Sekimoto; J. Suzuki; T. Taino; O. Tajima; N. Tomita; T. Uchida; E. Won; M. Yoshida
  EPJ Web of Conferences, Volume：168, Jan. 2018
  Our understanding of physics at very early Universe, as early as 10-35 s after the Big Bang, relies on the scenario known as the inflationary cosmology. Inflation predicts a particular polarization pattern in the cosmic microwave background, known as the B-mode yet the strength of such polarization pattern is extremely weak. To search for the B-mode of the polarization in the cosmic microwave background, we are constructing an off-axis rotating telescope to mitigate systematic effects as well as to maximize the sky coverage of the observation. We will discuss the present status of the GroundBIRD telescope.
  International conference proceedings
  DOI：https://doi.org/10.1051/epjconf/201816801014
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85040989645&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85040989645&origin=inward
  DOI ID：10.1051/epjconf/201816801014, ISSN：2101-6275, eISSN：2100-014X, SCOPUS ID：85040989645
• Absorber-coupled lumped element kinetic inductance detectors for gamma-rays　　　　　　　　　　　　　　　
  Masato Naruse; Noriaki Miyamoto; Tohru Taino; Hiroaki Myoren
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：541, First page：36, Last page：39, Oct. 2017
  We propose gamma-ray detectors based on superconducting resonators that can be largely multiplexed and show potential for quick response time, high spatial resolution, and high energy resolution. The resonators were fabricated with a niobium film on a silicon wafer. Eight out of ten detectors could be operated at 0.3 K. The detectors were coupled to a 2-mm-thick lead absorber and examined with a cesium 137 source. The pulse decay time was 3.6 mu s and energy resolution was 3.8 keV at 662 keV. We also describe the resonant properties of each detector. The proposed detectors are suitable for use as food-screening systems. (C) 2017 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2017.08.001
  DOI ID：10.1016/j.physc.2017.08.001, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000410647600006
• Improving the spatial resolution of superconducting tunnel junction THz wave detectors using a modified LiNbO3 absorber　　　　　　　　　　　　　　　
  M. Sone; N. Igarashi; M. Naruse; H. Myoren; Y. Sasaki; C. Otani; T. Taino
  Journal of Physics: Conference Series, Volume：871, Number：1, Jul. 2017, [Reviewed]
  We proposed a superconducting tunnel junction (STJ) detector for terahertz (THz) waves with a modified substrate absorber. The absorber of each STJ was isolated by trenches in order to restrict the diffusion of phonons generated by THz waves, which are made with a dicing process. We evaluated the diffusion characteristics of phonons in the LiNbO3 substrate by detecting THz photons. We found that the phonon diffusion length in a 500-μm-thick LiNbO3 substrate was over 1 mm. No degradation of the current - voltage (I-V) characteristics of the STJ after performing the dicing process.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/871/1/012069
  DOI ID：10.1088/1742-6596/871/1/012069, ISSN：1742-6596, SCOPUS ID：85028005068
• Development of STJ for neutron detector on Si-LBO hybrid substrate by surface-activated room-temperature bonding
  S. Endo; G. Fujii; M. Ukibe; H. Takagi; M. Ohkubo; M. Naruse; H. Myoren; C. Otani; T. Taino
  Journal of Physics: Conference Series, Volume：871, Number：1, Jul. 2017, [Reviewed]
  We have been developing superconducting tunnel junctions (STJs) for neutron detector on a Si-Li2B4O7 (LBO) hybrid substrate. An active area of each STJ was limited by dicing in order to obtain high spatial resolution. The Si-LBO hybrid substrate was bonded by a surface-activated room-temperature bonding. In this bonding method, the Si and LBO surfaces were sputter-etched by high energy Ar ion beam and bonded in a vacuum. We fabricated STJs on the Si-LBO hybrid substrate and measured their current-voltage characteristic. Their leakage currents (Ileak) were <
  10 nA, and so we succeeded in fabricating STJs on the Si-LBO hybrid substrate, which can be expected to operate as neutron detectors with high performance.
  Institute of Physics Publishing, English, International conference proceedings
  DOI：https://doi.org/10.1088/1742-6596/871/1/012070
  DOI ID：10.1088/1742-6596/871/1/012070, ISSN：1742-6596, ORCID：44982367, SCOPUS ID：85027976830
• Noise Properties of Digital SQUID Using Double Relaxation Oscillation SQUID Comparator With Relaxation Oscillation Resonant Circuit　　　　　　　　　　　　　　　
  Hiroaki Myoren; Ryota Kobayashi; Kenji Kumagai; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：27, Number：4, Jun. 2017
  We designed a digital superconducting quantum interference device (SQUID) system that contains a double relaxation oscillation SQUID (DROS) as a magnetic flux comparator that is connected to an additional relaxation oscillation (RO) circuit with mutually coupled inductances. In the designed digital SQUID, the RO circuit works as a resonator and increases the relaxation oscillation frequency without decreasing the input current of dc/SFQ converters. Numerical simulation shows that the digital SQUID system can operate up to 7 GHz. A fabricated digital SQUID using a DROS comparator with an RO circuit provides correct digital SQUID operation. For a magnetometer using the digital SQUID system, we can realize a magnetic field noise less than 1 pT/root Hz with a small signal bandwidth of more than 10 MHz.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2017.2677422
  DOI ID：10.1109/TASC.2017.2677422, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000399937400001
• Broadband Pillar-Type Antireflective Subwavelength Structures for Silicon and Alumina　　　　　　　　　　　　　　　
  Tom Nitta; Yutaro Sekimoto; Kazufusa Noda; Shigeyuki Sekiguchi; Shibo Shu; Hiroshi Matsuo; Agnes Dominjon; Masato Naruse; Nario Kuno; Naomasa Nakai
  IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, Volume：7, Number：3, First page：295, Last page：301, May 2017
  A broadband antireflective subwavelength structure was developed suitable for large diameter silicon or alumina lenses used in the optical systems of superconducting cameras. In this study, a broadband antireflective subwavelength structure that can be easily fabricated with a dicing blade was designed. The model comprised both a pyramidal section (550 mu m in depth) and a straight section (150 mu m in depth) to simplify fabrication with a metal bonded V-shaped blade and a normal straight dicing-blade. The simulated transmittance between 97 and 334 GHz was >90%, which is comparable to that with a 700-mu m-depth tapered structure. The structure was fabricated on a flat surface, and transmittance at cryogenic temperatures was measured using a Fourier transform spectrometer. The measured average transmittance between 186 and 346 GHz was approximately 95%, and the experimental result is in good agreement with the simulation results.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TTHZ.2017.2692045
  DOI ID：10.1109/TTHZ.2017.2692045, ISSN：2156-342X, eISSN：2156-3446, Web of Science ID：WOS:000401094100008
• Development of broadband planar ortho-mode transducer with MKID for LiteBIRD satellite　　　　　　　　　　　　　　　
  Shibo Shu; Shigeyuki Sekiguchi; Masakazu Sekine; Yutaro Sekimoto; Tom Nitta; Agnes Dominjon; Takashi Noguchi; Masato Naruse; Wenlei Shan
  27th International Symposium on Space Terahertz Technology, ISSTT 2016, 2017
  We report on a design of broadband circular waveguide coupled planar ortho-mode transducer (OMT) with Microwave Kinetic Inductance Detector (MKID) for LiteBIRD mission, a small-size satellite for cosmic microwave background (CMB) polarization signal full-sky mapping at large angular scale by JAXA. In our 4-pixel prototype design, each single pixel is sensitive to two frequency bands (90 GHz and 150 GHz) corresponding to atmospheric window for testing at Nobeyama 45-m telescope. Silicon on insulator (SOI) has been selected for OMT structure and a broadband coplanar waveguide (CPW) 180- degree hybrid is designed to cancel higher modes of a circular waveguide and add two signals from the fundamental mode together. After a distributed microstrip bandpass diplexer, a microstrip line to coplanar waveguide transition structure couples signal to MKID and MKIDs are read out with frequency domain multiplexing. MKIDs are designed with Nb ground plane and Al/Ti bilayer central strip to achieve low frequency response, high sensitivity and also adjustable transition temperature. A 4-pixel module is under test and we plan to deploy these multi-chroic polarimeters on Nobeyama 45-m telescope.
  International conference proceedings
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  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85021449355&origin=inward
  SCOPUS ID：85021449355
• Fabrication of TiN/AlN/TiN tunnel junctions　　　　　　　　　　　　　　　
  Takeru Nakayama; Masato Naruse; Hiroaki Myoren; Tohru Taino
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：530, First page：87, Last page：89, Nov. 2016
  We have fabricated TiN/AlN/TiN tunnel junctions with an epitaxial layer. The critical temperature of TiN can be changed in the range from 0.5 to 5.0 K. Therefore, it is easy to set 5.0 K as the target critical temperature. When a Superconducting Tunnel Junction (STJ) is operated as a photon detector, it is necessary to cool it to within 0.1 K of the critical temperature in consideration of the noise of the thermally stimulated currents. Because 0.3 K was desirable, as for the manufacture of general purpose photon detectors, the critical temperature 5.0 K. TiN and AlN films were deposited by dc and rf magnetron sputtering in a load-lock sputtering system at ambient substrate temperatures. The junctions have a gap voltage of V-g = 1.1 mV, and critical current density of J(c) = 0.24 A/cm(2), and R-sg/R-n of 7.2, and low subgap leakage current (I-sub@ 500 mu V = 180 nA). We report our experiment system, the manufacture method and the junction properties in this paper. (C) 2016 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2016.04.005
  DOI ID：10.1016/j.physc.2016.04.005, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000389518400026
• Fabrication of superconducting tunnel junctions with embedded coil for applying magnetic field　　　　　　　　　　　　　　　
  Kenji Yamaguchi; Hiroshi Nakagawa; Masahiro Aoyagi; Masato Naruse; Hiroaki Myoren; Tohru Taino
  PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Volume：530, First page：90, Last page：92, Nov. 2016
  We have proposed and demonstrated a superconducting tunnel junction (STJ) with an embedded coil for applying a magnetic field. The STJ was fabricated on the coil, which was embedded in a Si substrate. The coil in the Si substrate consists of superconducting microstrip lines and applies a magnetic field to the STJ to suppress the dc Josephson current. The embedded coil was designed with a line and space of 3 mu m and a thickness of 120 nm. To planarize the coil, we employed chemical mechanical polishing (CMP) in our fabrication process. In this STJ, the maximum current of the embedded coil was 28 mA, which corresponded to the maximum magnetic field of 11.76 mT. (C) 2016 Elsevier B.V. All rights reserved.
  ELSEVIER SCIENCE BV, English, Scientific journal
  DOI：https://doi.org/10.1016/j.physc.2016.03.010
  DOI ID：10.1016/j.physc.2016.03.010, ISSN：0921-4534, eISSN：1873-2143, Web of Science ID：WOS:000389518400027
• Radiation Tolerance of Aluminum Microwave Kinetic Inductance Detector　　　　　　　　　　　　　　　
  K. Karatsu; A. Dominjon; T. Fujino; T. Funaki; M. Hazumi; F. Irie; H. Ishino; Y. Kida; T. Matsumura; K. Mizukami; M. Naruse; T. Nitta; T. Noguchi; N. Oka; S. Sekiguchi; Y. Sekimoto; M. Sekine; S. Shu; Y. Yamada; T. Yamashita
  Journal of Low Temperature Physics, Volume：184, Number：3-4, First page：540, Last page：546, Aug. 2016
  © 2016, Springer Science+Business Media New York. Microwave kinetic inductance detector (MKID) is one of the candidates of focal plane detector for future satellite missions such as LiteBIRD. For the space use of MKIDs, the radiation tolerance is one of the challenges to be characterized prior to the launch. Aluminum (Al) MKIDs with 50 nm thickness on silicon substrate and on sapphire substrate were irradiated with a proton beam of 160 MeV at the heavy ion medical accelerator in Chiba. The total water-equivalent absorbed dose was ∼ 10 krad which should simulate the worst radiation absorption of 5 years observation at the Lagrange point L2. We measured characteristics of these MKIDs before and after the irradiation. We found no significant changes on resonator quality factor, responsivity, and recombination time of quasi-particles. The change on electrical noise equivalent power was also evaluated, and no significant increase was found at the noise level of O(10 - 18) W/Hz.
  Scientific journal
  DOI：https://doi.org/10.1007/s10909-016-1523-y
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  DOI ID：10.1007/s10909-016-1523-y, ISSN：0022-2291, eISSN：1573-7357, SCOPUS ID：84957585138
• Design and Magnetic Field Noise of Magnetometer Using Digital SQUID With Subflux Quantum Feedback　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kouhei Takatoku; Masato Naruse; Tohru Taino
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：26, Number：5, Aug. 2016
  Digital superconducting quantum interference devices (SQUIDs) based on single-flux quantum (SFQ) logic have attractive characteristics such as wide dynamic ranges and high slew rates. However, the resolution of a typical digital SQUID is limited by SFQ feedback. To realize lower magnetic field noise by magnetometers using digital SQUIDs, we have adopted two feedback combinations: one, utilizing the SFQ input/output for a main loop and the other, using a mutually coupled loop. The main loop receives direct Phi(0) feedback and subflux quantum feedback Phi(0)/n, where n is an integer from the mutually coupled loop. The flux resolution for the digital SQUID shows improvement with increasing n and reaches below 40 m Phi(0) at n = 2(10); however, the slew rate decreases with increasing n and reaches 1.22 x 10(6)Phi(0)/s at f(c) = 1.25 GHz and n = 2(10). For amagnetometer using a digital SQUID with a pickup loop, we confirmed a magnetic field noise of less than 100 fT/root Hz with a signal bandwidth of 1 MHz for operation frequency f(c) of 20 GHz.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2016.2569500
  DOI ID：10.1109/TASC.2016.2569500, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000380321300001
• Effect of Quasiparticles in the Intragap States on the Superconducting Surface Resistance　　　　　　　　　　　　　　　
  Takashi Noguchi; Masato Naruse; Masakazu Sekine; Kenichi Karatsu; Yutaro Sekimoto
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：26, Number：3, Apr. 2016
  The Mattis-Bardeen theory is extended by introducing the complex number of the superconducting gap energy, by which BCS density of states is broadened and the small density of quasiparticle states that appears in the energy gap is well predicted. Using the extended Mattis-Bardeen theory, the surface resistance of superconductors and quality factors of superconducting resonators are calculated. It is shown that simulated temperature dependence of quality factors of superconducting resonators agree very well with the measured ones. It is also demonstrated that the calculated residual quasiparticle number of a superconducting resonator using the density of states consisting of the gap-broadened and localized quasiparticle states agrees quantitatively with the measured one.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2016.2528546
  DOI ID：10.1109/TASC.2016.2528546, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000375584000001
• Dual-Double Slot Antennas Fabricated with Single Superconducting Film for Millimeter Wave Camera　　　　　　　　　　　　　　　
  Masato Naruse; Tom Nitta; Kenichi Karatsu; Msakazu Sekine; Shigeyuki Sekiguchi; Yutaro Sekimoto; Takashi Noguchi; Tohru Taino; Hiroaki Myoren
  JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, Volume：37, Number：2, First page：128, Last page：136, Feb. 2016
  We propose an entirely plane-structure camera for millimeter wave astronomy, in order to reduce production cost and time. The camera is composed of a silicon lens-let, antennas, feed lines, and detectors made from the same superconducting aluminum film on a silicon substrate. A couple of double-slot antennas are located the same focal plane of a small substrate lens to enhance the packing density of detectors and observation efficiency. To achieve high sensitivity, we adapted a microwave kinetic inductance detector as a photon sensor, which consists of a superconducting microresonator. We examined the optical performance of the camera attached to a silicon lens array at 220 GHz in a 0.3 K cryostat. The measured beams were in good agreement with the calculations within the dynamic range of the setup (20 dB). Polarization misalignments between the dual-double slot antenna were less than 2(a similar to), and cross-polarization level was around -7 dB. The relatively high cross-polarization would be explained by an antenna crosstalk mediated by quasiparticle diffusion.
  SPRINGER, English, Scientific journal
  DOI：https://doi.org/10.1007/s10762-015-0216-y
  DOI ID：10.1007/s10762-015-0216-y, ISSN：1866-6892, eISSN：1866-6906, Web of Science ID：WOS:000368053700002
• Design of corrugated-horn-coupled MKID focal plane for CMB B-mode polarization　　　　　　　　　　　　　　　
  Yutaro Sekimoto; Shigeyuki Sekiguchi; Shibo Shu; Masakazu Sekine; Tom Nitta; Masato Naruse; Agnes Dominjon; Takashi Hasebe; Wenlei Shan; Takashi Noguchi; Akihira Miyachi; Makoto Mita; Shigeo Kawasaki
  MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VIII, Volume：9914, 2016
  A focal plane based on MKID has been designed for cosmic microwave background (CMB) B-mode polarization experiments. We are designing and developing a focal plane with broadband corrugated horn array, planar OMT, 180 degree hybrid, bandpass filters, and MKIDs. The focal plane consists of 3 octave bands (55 - 108 GHz, 80 - 160 GHz, 160 - 320 GHz), 10 hexagonal modules. Broadband corrugated horn-array has been directly machined from an Al block and measured to have a good beam shape which is consistent with electromagnetic field simulations in octave bands. The horn array is designed to be low standing-wave, light weight, and electromagnetic shield. The broadband 4 probes ortho-mode transducer (OMT) is fabricated on Si membrane of an SOI wafer. A broadband 180 degree hybrid made with coplanar waveguide (CPW) is used to reduce higher modes of the circular waveguide. Two bandpass filters of each polarization are patterned with Nb microstrip. A prototype of the broadband corrugated horn coupled MKIDs has been fabricated and tested.
  SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
  DOI：https://doi.org/10.1117/12.2231074
  DOI ID：10.1117/12.2231074, ISSN：0277-786X, eISSN：1996-756X, Web of Science ID：WOS:000385793800056
• Development of octave-band planar orthomode transducer with kinetic inductance detector for LiteBIRD　　　　　　　　　　　　　　　
  Shibo Shu; Shigeyuki Sekiguchi; Masakazu Sekine; Yutaro Sekimoto; Tom Nitta; Agnes Dominjon; Takashi Noguchi; Masato Naruse; Wenlei Shan
  MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VIII, Volume：9914, 2016
  We demonstrate a design of octave-band circular waveguide coupled planar ortho-mode transducer (OMT) with Microwave Kinetic Inductance Detector (MKID) for LiteBIRD mission, a small-size satellite for cosmic microwave background (CMB) polarization signal full-sky mapping. In our 4-pixel prototype design, each single pixel is sensitive to two frequency bands (90 GHz and 150 GHz) corresponding to atmospheric window. Silicon on insulator (SOI) has been selected for OMT structure and a broadband coplanar waveguide (CPW) 180-degree hybrid is designed to cancel higher modes of a circular waveguide and add two signals from the fundamental mode together. After a microstrip bandpass diplexer, a microstrip line to coplanar waveguide transition structure couples signal to MKID. MKIDs are designed with Nb ground plane and Al/Ti bilayer center strip line to achieve low frequency response and high sensitivity. A 4-pixel module is under test and we plan to deploy these multichroic polarimeters on Nobeyama 45 m telescope.
  SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
  DOI：https://doi.org/10.1117/12.2231877
  DOI ID：10.1117/12.2231877, ISSN：0277-786X, eISSN：1996-756X, Web of Science ID：WOS:000385793800058
• Single-Flux Quantum Readout Circuits for Photon-Number-Resolving Superconducting Nanowire Single-Photon Detectors　　　　　　　　　　　　　　　
  Hiroaki Myoren; Shunsuke Takeda; Masato Naruse; Tohru Taino; Jian Chen; Peiheng Wu
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：25, Number：3, Jun. 2015
  Superconducting nanowire single-photon detectors (SNSPDs) with series-parallel meander-type configurations are demonstrated to have photon-number-resolving capabilities and are expected to be used for an evaluation system of single-photon generators and/or an energy-resolved fast detector for a new-generation time-of-flight mass spectrometry. In this paper, we present the design, fabrication, and confirmation of correct operations of two kinds of single-flux-quantum (SFQ) digital readout circuits for an SNSPD with a series-parallel meander-type configuration. Assuming a six-parallel meander-type configuration, we designed: 1) a six-level current discriminator using six different magnetically coupled DC/SFQ converter circuits; and 2) a Delta-type A/D converter using a quasi-one-junction SQUID (QOS) comparator with an SFQ feedback loop. For the design of the magnetically coupled inputs, we used a 3-D inductance extraction program FastHenry and the designed circuits were fabricated using a HYPRES 4.5-kA/cm(2) Nb process and a National Institute of Advanced Industrial Science and Technology (AIST) standard 2.5-kA/cm(2) Nb process.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2014.2365356
  DOI ID：10.1109/TASC.2014.2365356, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000384888700001
• Development of Microwave Kinetic Inductance Detector for Cosmological Observations　　　　　　　　　　　　　　　
  Kenichi Karatsu; Satoru Mima; Shugo Oguri; Jihoon Choi; R. M. Thushara Damayanthi; Agnes Dominjon; Noboru Furukawa; Hirokazu Ishino; Hikaru Ishitsuka; Atsuko Kibayashi; Yoshiaki Kibe; Hitoshi Kiuchi; Kensuke Koga; Masato Naruse; Tom Nitta; Takashi Noguchi; Takashi Okada; Chiko Otani; Shigeyuki Sekiguchi; Yutaro Sekimoto; Masakazu Sekine; Shibo Shu; Osamu Tajima; Kenta Takahashi; Nozomu Tomita; Hiroki Watanabe; Mitsuhiro Yoshida
  IEICE TRANSACTIONS ON ELECTRONICS, Volume：E98C, Number：3, First page：207, Last page：218, Mar. 2015
  A precise measurement of Cosmic Microwave Background (CMB) provides us rich information about the universe. In particular, its asymmetric polarization patterns, B-modes, are smoking gun signature of inflationary universe. Magnitude of the B-modes is order of 10 nK. Its measurement requires a high sensitive millimeter-wave telescope with a large number of superconducting detectors on its focal plane. Microwave Kinetic Inductance Detector (MKID) is appropriate detector for this purpose. MKID camera has been developed in cooperation of National Astronomical Observatory of Japan (NAOJ), Institute of Physical and Chemical Research (RIKEN), High Energy Accelerator Research Organization (KEK), and Okayama University. Our developments of MKID include: fabrication of high-quality superconducting film; optical components for a camera use; and readout electronics. For performance evaluation of total integrated system of our MKID camera, a calibration system was also developed. The system was incorporated in a 0.1 K dilution refrigerator with modulated polarization source. These developed technologies are applicable to other types of detectors.
  IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG, English, Scientific journal
  DOI：https://doi.org/10.1587/transele.E98.C.207
  DOI ID：10.1587/transele.E98.C.207, ISSN：1745-1353, Web of Science ID：WOS:000359521800008
• SFQ Amplified Circuit for Photon-Number-Resolving SNSPD Array　　　　　　　　　　　　　　　
  Kazuki Ota; Masato Naruse; Tohru Taino; Hiroaki Myoren; Jian Chen; Lin Kang; Peiheng Wu
  2015 15TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), 2015, [Reviewed]
  Superconducting nanowire single-photon detectors (SNSPDs) with series-parallel meander-type configuration are demonstrated to have photon-number-resolving (PNR) capabilities. Based on this unique feature, SNSPDs are expected to be used in the evaluation of single photon sources. However, increasing the number of SNSPDs causes an increase in the heat flow and further degradation in the timing jitter. To resolve this problem, the use of single flux quantum (SFQ) logic circuits is proposed. In this study, we present the read-out circuit for the SNSPD array, based on the SFQ logic. Our design of the read-out circuit makes it feasible to simultaneously process six SNSPD signals at 500 MHz and amplify the output voltage as an input to other circuits without the need for any amplifiers. We confirm using simulations that our designed read-out circuit has these capabilities. Furthermore, it is shown that the output voltage increases by 4.8 mV, proportional to the number of SNSPD signals and the output voltage is between 4.8 and 27.8 mV.
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000380391200053
• Design of MKID focal plane array for LiteBIRD　　　　　　　　　　　　　　　
  Yutaro Sekimoto; Ken'ichi Karatsu; Tom Nitta; Masakazu Sekine; Shigeyuki Sekiguchi; Takashi Okada; Shibo Shu; Takashi Noguchi; Agnes Dominjon; Masato Naruse
  26th International Symposium on Space Terahertz Technology, ISSTT 2015, 2015
  An MKID focal plane array has been designed for LiteBIRD, which is a future satellite to probe B-mode polarization of cosmic microwave background radiation. Octaveband corrugated horn arrays and planar OMTs are designed for the feed. Three kinds of feed modules detect photons from 55 GHz to 330 GHz with 6 frequency bands. This focal plane array consists of 2780 MKID detectors.
  International conference proceedings
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84947209625&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84947209625&origin=inward
  SCOPUS ID：84947209625
• Design and Performance of Digital SQUID with Sub-Flux Quantum Resolution　　　　　　　　　　　　　　　
  Hiroaki Myoren; Kouhei Takatoku; Masato Naruse; Tohru Taino
  2015 15TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), 2015
  Digital SQUIDs based on the single flux quantum (SFQ) logic have attractive characteristics, such as wide dynamic range and high slew rate. However, the resolution of digital SQUIDs is limited to SFQ. To realize sub-flux quantum resolution for these SQUIDs, we have adopted two types of feedback combinations: one with the SFQ input/output for a main loop and the other with a mutually coupled loop. The main loop receives direct Phi(0) feedback and sub-flux quantum feedback Phi(0)/n, where n is an integer, from the mutually coupled loop. We confirmed the correct operation of our device at a clock frequency of 1.25 GHz for a digital SQUID with a sub-Phi(0) flux feedback resolution of Phi(0)/8 from circuit simulation. The slew rate is found to be 1.56x10(8) Phi(0)/s in this simulation (f(c) = 1.25 GHz, n=8). The flux resolution for the digital SQUID shows improvement with increasing n and reached below 40 m Phi(0) with n=2(10); however the slew rate is decreased with increasing n and reached 1.22x10(6) Phi(0)/s with f(c)=1.25 GHz and n=2(10).
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000380391200018
• Development of a Compact Cold Optics for Millimeter and Submillimeter Wave Observations　　　　　　　　　　　　　　　
  Shigeyuki Sekiguchi; Tom Nitta; Kenichi Karatsu; Yutaro Sekimoto; Norio Okada; Toshihiro Tsuzuki; Shingo Kashima; Masakazu Sekine; Takashi Okada; Shibo Shu; Masato Naruse; Agnes Dominjon; Takashi Noguchi; Hiroshi Matsuo
  IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, Volume：5, Number：1, First page：49, Last page：56, Jan. 2015
  We have developed an optics for 220 GHz observations, which is a compact cold re-imaging one from a telescope focal plane, with F / # = 6 to a detector plane with F / # = 1 at 100 mK. It employs two high refractive lenses, high purity alumina (n = 3.1) and silicon (n = 3.4). To reduce the incident stray light into the detector, a cold nested baffle composed of four reflectors with the same spherical shape has been developed. The stray light power is simulated to be 0.2 mu W which corresponds a quarter of that of a without-baffles case. The total transmittance of three kinds of IR blocking filters is 0.78 at the observation frequency, and less than 10(-10) above 6 THz. Thermal flow power into the detector, including the stray light power, is about 0.7 mu W. The cold optics with an 600 pixels MKID camera has been cooled down to 100 mK.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TTHZ.2014.2367245
  DOI ID：10.1109/TTHZ.2014.2367245, ISSN：2156-342X, Web of Science ID：WOS:000348124900010
• Close-Packed Silicon Lens Antennas for Millimeter-Wave MKID Camera　　　　　　　　　　　　　　　
  Tom Nitta; Kenichi Karatsu; Yutaro Sekimoto; Masato Naruse; Masakazu Sekine; Shigeyuki Sekiguchi; Hiroshi Matsuo; Takashi Noguchi; Kenji Mitsui; Norio Okada; Masumichi Seta; Naomasa Nakai
  JOURNAL OF LOW TEMPERATURE PHYSICS, Volume：176, Number：5-6, First page：684, Last page：690, Sep. 2014
  We have been developing a large-format millimeter-wave camera based on lens-antenna-coupled microwave kinetic inductance detectors (MKIDs) for a planned telescope at Dome Fuji (3810 m a.s.l.), Antarctica. Optical coupling to the MKID incorporates double-slot antennas and a silicon lens array. To realize a large-format camera (10,000 pixels), a highly integrated small-diameter lens array and fast optics are required. Lens diameters of 1.2, 2, and 3 times the target wavelength are investigated for the main beam symmetry, side-lobe level, cross-polarization level, and bandwidth, considering the effects of the surrounding lenses. In this study, we present the simulated beam pattern profiles of close-packed lens antenna and the effect of misalignment between the silicon lens and double-slot antenna. We also show the evaluations of the developed 721-pixel close-packed silicon lens array.
  SPRINGER/PLENUM PUBLISHERS, English, Scientific journal
  DOI：https://doi.org/10.1007/s10909-013-1028-x
  DOI ID：10.1007/s10909-013-1028-x, ISSN：0022-2291, eISSN：1573-7357, Web of Science ID：WOS:000339875400011
• Anti-reflection Coating for Cryogenic Silicon and Alumina Lenses in Millimeter-Wave Bands　　　　　　　　　　　　　　　
  Tom Nitta; Shigeyuki Sekiguchi; Yutaro Sekimoto; Kenji Mitsui; Norio Okada; Kenichi Karatsu; Masato Naruse; Masakazu Sekine; Hiroshi Matsuo; Takashi Noguchi; Masumichi Seta; Naomasa Nakai
  JOURNAL OF LOW TEMPERATURE PHYSICS, Volume：176, Number：5-6, First page：677, Last page：683, Sep. 2014
  A dielectric lens with high refractive index is suitable for focusing cryogenic devices in millimeter-wave bands when an appropriate anti-reflection (AR) coating is applied. Two types of AR coatings for silicon and alumina were studied at the millimeter-wave (220 GHz) band: one is by direct machining of mixed epoxy for a silicon lens array, while the other is by laser machining of an antireflective subwavelength structure for a large alumina lens used in a re-imaging optics system. The millimeter-wave optical properties of silicon, alumina, aluminum nitride, and Stycast epoxies were measured with a Fourier Transform Spectrometer (FTS) at cryogenic temperatures. The measured refractive index of the AR coating with a mixture of Stycast 1266 (n = 1.68) and Stycast 2850FTJ (n = 2.2) for silicon at 30 K was 1.84. The thickness of the epoxy AR coating was precisely controlled with direct machining. Transmittance of the AR-coated silicon substrate, measured with FTS, was approximately 95 % at the center frequency of the 220 GHz band with a bandwidth of 25 % at 27 K. An antireflective subwavelength structure was designed for an alumina sample with periodic cylindrical holes. The measured 220-GHz-band transmittance was above 90 % with a bandwidth of 25 % at 25 K.
  SPRINGER/PLENUM PUBLISHERS, English, Scientific journal
  DOI：https://doi.org/10.1007/s10909-013-1059-3
  DOI ID：10.1007/s10909-013-1059-3, ISSN：0022-2291, eISSN：1573-7357, Web of Science ID：WOS:000339875400010
• Measurement of MKID performance with high-speed and wide-band readout system　　　　　　　　　　　　　　　
  Kenichi Karatsu; M. Naruse; T. Nitta; M. Sekine; S. Sekiguchi; Y. Sekimoto; T. Noguchi; Y. Uzawa; H. Matsuo; H. Kiuchi
  Journal of Low Temperature Physics, Volume：176, Number：3-4, First page：459, Last page：464, Aug. 2014
  Microwave kinetic inductance detectors (MKIDs) are being developed at the National Astronomical Observatory of Japan to enable precise measurements of the cosmic microwave background. One of the features of MKIDs is scalability using a frequency-division multiplexing (FDMUX) readout scheme. A digital fast fourier transform spectrometer (FFTS) is a good way to read out a number of resonance frequencies simultaneously and fully utilize the advantage of FDMUX of MKIDs. We have developed FFTS readout electronics using an ADC/DAC with 1 Gsps (sample per second) sampling rate and 270 MHz bandwidth. We measured the noise characteristics of a single MKID in the frequency range of 60 Hz-30 kHz with this readout system, and found the noise was almost equivalent to the noise measured by ordinary analog IQ down-converter readout. This indicates our FFTS electronics do not add any additional noise to the MKID readout system over the frequency range. © 2014 Springer Science+Business Media New York.
  International conference proceedings
  DOI：https://doi.org/10.1007/s10909-014-1115-7
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84904068316&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84904068316&origin=inward
  DOI ID：10.1007/s10909-014-1115-7, ISSN：0022-2291, eISSN：1573-7357, SCOPUS ID：84904068316
• Developments of wide field-of-view MKID cameras for millimeter and submillimeter astronomy　　　　　　　　　　　　　　　
  Y. Sekimoto; T. Nitta; K. Karatsu; M. Sekine; S. Sekiguchi; T. Okada; S. Shu; T. Noguchi; M. Naruse; K. Mitsui; N. Okada; T. Tsuzuki; H. Matsuo
  8th European Conference on Antennas and Propagation, EuCAP 2014, First page：2407, Last page：2408, 2014
  Wide field-of-view (FoV) MKID cameras for millimeter and sub millimeter astronomy have been developed at the Advanced Technology Center of NAOJ. To observe large scale structure of the universe, thousands of pixels with high sensitive detectors are required. We demonstrate key technologies, such as 700 pixel 220 GHz MKID camera, Si lens array, anti-reflection (AR) coating for Si and Alumina lens, wide FoV cryogenic optics, and read-out circuit for MKID cameras.
  International conference proceedings
  DOI：https://doi.org/10.1109/EuCAP.2014.6902302
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84908635531&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84908635531&origin=inward
  DOI ID：10.1109/EuCAP.2014.6902302, SCOPUS ID：84908635531
• Developments of wide field submillimeter optics and lens antenna-coupled MKID cameras　　　　　　　　　　　　　　　
  Y. Sekimoto; T. Nitta; K. Karatsu; M. Sekine; S. Sekiguchi; T. Okada; S. Shu; T. Noguchi; M. Naruse; K. Mitsui; N. Okada; T. Tsuzuki; A. Dominjon; H. Matsuo
  Proceedings of SPIE - The International Society for Optical Engineering, Volume：9153, 2014
  Wide field cryogenic optics and millimeter-wave Microwave Kinetic Inductance Detector (MKID) cameras with Si lens array have been developed. MKID is a Cooper-pair breaking photon detector and consists of supercon-ducting resonators which enable microwave (∼GHz) frequency multiplexing. Antenna-coupled Aluminum CPW resonators are put in a line on a Si substrate to be read by a pair of coaxial cables. A 220 GHz-600 pixels MKID camera with anti-reflection (AR) coated Si lens has been demonstrated in an 0.1 K cryostat. A compact cryogenic system with high refractive index materials has been developed for the MKID camera.
  International conference proceedings
  DOI：https://doi.org/10.1117/12.2055666
  Scopus：https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84921354953&origin=inward
  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84921354953&origin=inward
  DOI ID：10.1117/12.2055666, ISSN：0277-786X, eISSN：1996-756X, SCOPUS ID：84921354953
• Design of a compact cold optics for millimeter wave observations　　　　　　　　　　　　　　　
  Shigeyuki Sekiguchi; Tom Nitta; Kenichi Karatsu; Yutaro Sekimoto; Norio Okada; Toshihiro Tsuzuki; Shingo Kashima; Masakazu Sekine; Takashi Okada; Shibo Shu; Masato Naruse; Agnes Dominjon; Takashi Noguchi; Hiroshi Matsuo
  ISSTT 2014 - 25th International Sympsoium on Space Terahertz Technology, Proceedings, First page：49, Last page：51, 2014
  An optics which we have developed for 220 GHz observations is a compact cold re-imaging one from a telescope focal plane with F/# = 6 to a detector plane with F/# = 1 at 100 mK. It employs two high refractive lenses, high purity alumina (n=3.1) and silicon (n=3.4). To reduce the incident stray light into the detector, a cold nested baffle composed of 4 reflectors with the same spherical shape has been developed. The stray light power is simulated to be 0.2 μW which corresponds a quarter of that of a without-baffles case. The total transmittance of three kinds of IR blocking filters is 0.78 at the observation frequency, and less than 10 -10 above 6 THz. Thermal flow power into the detector, including the stray light power, is about 0.7 μW. The cold optics with an 600 pixels MKID camera has been cooled down to 100 mK.
  International conference proceedings
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  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84923183987&origin=inward
  SCOPUS ID：84923183987
• Contribution of Quasiparticles in the Subgap States to the Surface Impedance of Superconductors　　　　　　　　　　　　　　　
  Takashi Noguchi; Masato Naruse; Yutaro Sekimoto
  IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Volume：23, Number：3, Jun. 2013
  The surface impedance of a superconductor has been calculated using the extended Mattis-Bardeen theory, in which the complex gap energy are taken into account. It is found that the surface resistance of the superconductor increases with increasing magnitude of the imaginary part of the gap energy. It is also found that the surface resistance of an NbN film calculated by the extended Mattis-Bardeen equation quantitatively agrees well with the measured one. It is shown that temperature dependence of not only Q values but also residual numbers of quasiparticles of superconducting resonators agree well with those calculated by the extended Mattis-Bardeen equation. It is also shown that phonon-assisted gradual relaxation of excess quasiparticles passing through the intragap states is dominant rather than the direct recombination into Cooper pairs.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TASC.2013.2240761
  DOI ID：10.1109/TASC.2013.2240761, ISSN：1051-8223, eISSN：1558-2515, Web of Science ID：WOS:000318867100019
• Optical Efficiencies of Lens-Antenna Coupled Kinetic Inductance Detectors at 220 GHz　　　　　　　　　　　　　　　
  Masato Naruse; Yutaro Sekimoto; Takashi Noguchi; Akihira Miyachi; Kenichi Karatsu; Tom Nitta; Masakazu Sekine; Yoshinori Uzawa; Tohru Taino; Hiroaki Myoren
  IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, Volume：3, Number：2, First page：180, Last page：186, Mar. 2013
  We have been developing a terahertz camera based on antenna-coupled superconducting resonators, the so-called microwave kinetic inductance detectors (MKIDs), and a silicon lens array. The MKID consists of a coplanar waveguide coupled to a double slot antenna and is patterned on a high-quality aluminum film grown by molecular beam epitaxy. The camera is sensitive at frequencies of 200-240 GHz. Its bandwidth is limited by the impedance properties of the double slot antenna. The design, fabrication, and optical evaluations of the planar antennas and silicon lens arrays are presented in this paper. The MKID camera has been evaluated both in dark conditions and under optical radiation in a 0.1-K dilution refrigerator. The electrical noise equivalent power was around 5x10(-18)W/root HZ in dark conditions and 4x10(-16)W/root HZ, which is much lower than the photon noise level, with the optical load. The optical efficiency of the camera was estimated by three independent methods, and the results were consistent with each other and equal to 20%-25% without an anti-reflection coating on the lens surface.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TTHZ.2012.2237029
  DOI ID：10.1109/TTHZ.2012.2237029, ISSN：2156-342X, eISSN：2156-3446, Web of Science ID：WOS:000318770300010
• SFQ Digital Signal Processing Circuits for Multi-Quantum Beam Detectors using STJ Array with Neutron Absorbers　　　　　　　　　　　　　　　
  Hiroaki Myoren; Yuta Akamatsu; Ryo Sasaki; Shoji Sato; Masato Naruse; Tohru Taino
  2013 IEEE 14TH INTERNATIONAL SUPERCONDUCTIVE ELECTRONICS CONFERENCE (ISEC), 2013
  We studied multi-quantum beam detectors using a superconducting tunnel junction (STJ) array with neutron absorbers. Using a neutron absorber for each of the STJs, we expected the STJ detector to exhibit a high spatial resolution and high detection efficiency for neutrons as well as radiative beams such as X-rays. To obtain diffraction patterns of the Xray and neutrons, we propose the use of a multi-quantum beam detector using an STJ array and single flux quantum (SFQ) signal processing at low temperature because of its high-speed and low-power operation. The kinetic energy is determined for individual neutrons using time-of-flight-methods that employ SFQ time-to-digital converters (TDCs). To separately detect alpha-particles and gamma-ray particles that are produced by the nuclear reaction between neutrons and boron, and X-ray photons, excess quasi-particle currents of the STJ detectors are processed by V/F type analog-to-digital converters and T-FF binary counters using SFQ digital circuits. To obtain the multiplexed readout of an STJ detector array, we designed a current bias switching circuit controlled by an SFQ driver for time-domain multiplexing. We designed the main circuits for this SFQ signal processing system and fabricated them using the ISTEC SRL Nb standard process II (STP2).
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000333277300034
• Beam Pattern Measurements of Millimeter-Wave Kinetic Inductance Detector Camera With Direct Machined Silicon Lens Array　　　　　　　　　　　　　　　
  Tom Nitta; Masato Naruse; Yutaro Sekimoto; Kenji Mitsui; Norio Okada; Kenichi Karatsu; Masakazu Sekine; Hiroshi Matsuo; Takashi Noguchi; Yoshinori Uzawa; Masumichi Seta; Naomasa Nakai
  IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, Volume：3, Number：1, First page：56, Last page：62, Jan. 2013
  We have developed 220 and 440-GHz cameras using microwave kinetic inductance detectors (MKIDs) for astronomical observations. The optical system of the MKID camera is based on double-slot antennas and extended hemispherical silicon lens arrays. The lens diameter is three times the target wavelength. The 220-GHz camera and the 440-GHz camera have 9 pixels and 102 pixels, respectively. The silicon lens array has been directly machined using a high-speed spindle on an ultra-precision machine. The shape fabrication error and the surface roughness of the top of the lens were typically less than 10 mu m (peak-to-valley) and about 0.7 mu m (rms), respectively. The beam patterns of the MKID camera were measured and are in good agreement with the calculations.
  IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, English, Scientific journal
  DOI：https://doi.org/10.1109/TTHZ.2012.2235123
  DOI ID：10.1109/TTHZ.2012.2235123, ISSN：2156-342X, Web of Science ID：WOS:000318770000010
• Development of crystal al MKIDs by molecular beam epitaxy　　　　　　　　　　　　　　　
  M. Naruse; Y. Sekimoto; T. Noguchi; A. Miyachi; Y. Uzawa; T. Nitta
  Journal of Low Temperature Physics, Volume：167, Number：3-4, First page：373, Last page：378, Jun. 2012
  We report here the effect of film qualities in superconductors on the properties of Microwave Kinetic Inductance Detectors (MKIDs). The sensitivity of MKIDs between crystal aluminum films and amorphous aluminum films is compared. The good quality and crystallized aluminum films have been prepared by using molecular beam epitaxy.We have confirmed that epitaxial Al(111) films were grown on Si(111) substrates with X-ray diffraction and in-situ reflection high-energy electron diffraction measurements. The amorphous aluminum films on the Si(111) wafers have been deposited by electron beam evaporation. We have measured transmission losses of MKIDs, noise spectrum and relaxation time against optical pulses, changing MKIDs' bath temperature from 0.11 K to 0.55 K in a dilution refrigerator. Despite of the improvement in normal resistivity, the quasiparticle decay time of both films are equivalent and 450 s at 0.11 K. The electrical noise equivalent power of the both MKIDs are also comparable and around 10-17 W/Hz. Fabrication details and performance data of both films are presented. © Springer Science+Business Media, LLC 2012.
  International conference proceedings
  DOI：https://doi.org/10.1007/s10909-011-0430-5
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  DOI ID：10.1007/s10909-011-0430-5, ISSN：0022-2291, eISSN：1573-7357, SCOPUS ID：84863727015
• Development of direct machined silicon lens array for millimeter-wave kinetic inductance detector cameraa　　　　　　　　　　　　　　　
  Tom Nitta; Masato Naruse; Yutaro Sekimoto; Kenji Mitsui; Norio Okada; Kenichi Karatsu; Masakazu Sekine; Hiroshi Matsuo; Takashi Noguchi; Yoshinori Uzawa; Masumichi Seta; Naomasa Nakai
  23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012, First page：39, Last page：41, 2012
  We have developed 220 GHz camera using microwave kinetic inductance detectors (MKIDs) for astronomical observations. The optical system of the MKID camera is based on double slot antennas and an extended hemispherical silicon lens array. The diameter of the lens was determined as three times larger than the wavelength at 220 GHz. The 220 GHz camera has 9 pixels. The silicon lens array has been directly machined by highspeed spindle on an ultra-precision machine. The shape fabrication error and the surface roughness of the top of the lens were less than 20 urn (Peak-to-Valley) and about 0.7 urn (rms), respectively. The beam patterns of the MKID camera were measured and are in good agreement with the calculations.
  International conference proceedings
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  SCOPUS ID：84880567673
• Development of 1000 arrays MKID Camera for the CMB Observation　　　　　　　　　　　　　　　
  Kenichi Karatsu; Masato Naruse; Tom Nitta; Masakazu Sekine; Yutaro Sekimoto; Takashi Noguchi; Yoshinori Uzawa; Hiroshi Matsuo; Hitoshi Kiuchi
  MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VI, Volume：8452, 2012
  A precise measurement of the Cosmic Microwave Background (CMB) provides us a wealth of information about early universe. LiteBIRD is a future satellite mission lead by High Energy Accelerator Research Organization (KEK) and its scientific target is detection of the B-mode polarization of the CMB, which is a footprint of primordial gravitational waves generated during inflation era, but has not been successfully observed so far due to lack of sensitivity. Microwave Kinetic Inductance Detector (MKID) is one candidate of sensitive millimeter-wave camera which will be able to detect the B-mode polarization. We have been developing MKID at National Astronomical Observatory of Japan (NAOJ) in cooperation with KEK and RIKEN for the focal plane detector of the LiteBIRD. The developed technologies are: fabrication process of MKIDs with epitaxially-formed aluminum (Al) on silicon (Si) wafer; optical system of the camera consisting of double-slot antenna with Si lens array; and readout circuit utilizing Fast Fourier Transform Spectrometer (FFTS). With these technologies, we designed a prototype MKIDs camera for the LiteBIRD.
  SPIE-INT SOC OPTICAL ENGINEERING, English, International conference proceedings
  DOI：https://doi.org/10.1117/12.925775
  DOI ID：10.1117/12.925775, ISSN：0277-786X, eISSN：1996-756X, Web of Science ID：WOS:000312884000021
• RF conductivity and surface impedance of a superconductor taking into account the complex superconducting gap energy　　　　　　　　　　　　　　　
  Takashi Noguchi; Masato Naruse; Yutaro Sekimoto
  SUPERCONDUCTIVITY CENTENNIAL CONFERENCE 2011, Volume：36, First page：318, Last page：323, 2012
  The Mattis-Bardeen theory for the anomalous skin effect in the superconductors has been extended taking the complex gap energy into account and the surface impedance of superconductors has been calculated using the extended Mattis-Bardeen theory. It is found that the surface resistance of the superconductor increases with increasing magnitude of the imaginary part of the gap energy. It is demonstrated that the calculated surface resistance for a NbN film quantitatively agrees with the measured one. It is also found that temperature dependence of Q values of superconducting resonators is well described by those calculated by the extended Mattis-Bardeen equation. (C) 2012 Published by Elsevier B.V. Selection and/or peer-review under responsibility of Guest Editors.
  ELSEVIER SCIENCE BV, English, International conference proceedings
  DOI：https://doi.org/10.1016/j.phpro.2012.06.166
  DOI ID：10.1016/j.phpro.2012.06.166, ISSN：1875-3892, Web of Science ID：WOS:000314403400056
• Development of a Submillimeter Double-Ridged Waveguide Ortho-Mode Transducer (OMT) for the 385-500 GHz Band　　　　　　　　　　　　　　　
  Mamoru Kamikura; Masato Naruse; Shin'ichiro Asayama; Naohisa Satou; Wenlei Shan; Yutaro Sekimoto
  JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, Volume：31, Number：6, First page：697, Last page：707, Jun. 2010
  We present design and evaluations of a submillimeter double-ridged waveguide ortho-mode transducer (OMT) for ALMA Band 8 (385-500 GHz) cartridge receiver. The measured transmission loss of the OMT at 4 K was 0.4-0.5 dB according to noise measurements with an SIS mixer. The polarization isolation was measured to be larger than 29 dB from quasioptical measurements. The OMT consists of a BI center dot ifot junction and a double-ridged guide. A robust design with allowable mechanical errors of 20 mu m has been demonstrated.
  SPRINGER, English, Scientific journal
  DOI：https://doi.org/10.1007/s10762-010-9632-1
  DOI ID：10.1007/s10762-010-9632-1, ISSN：1866-6892, Web of Science ID：WOS:000276543300007
• Near-field beam pattern measurement of qualification model of ALMA band 8 (385-500 GHz) cartridge receiver　　　　　　　　　　　　　　　
  Masato Naruse; Tetsuya Ito; Yutaro Sekimoto; Hiroyuki Toba; Naohisa Satou; Masahiro Sugimoto; Wenlei Shan; Yoshizou Iizuka; Toshiaki Kamba; Mamoru Kamikura; Yasutaka Serizawa
  EXPERIMENTAL ASTRONOMY, Volume：24, Number：1-3, First page：89, Last page：107, May 2009
  We have developed a near-field vector beam measurement system covering the range of frequencies from 385 to 500 GHz. The measurement set-up is capable of measurements with dynamic range exceeding 50 dB and amplitude and phase stability respectively of 0.1 dB/h and 1 degree/5 min at room temperature. Beam patterns of the ALMA band 8 corrugated horns and receiver optics block were measured at room temperature and lately compared with physical optics calculations obtained in the far-field. Both co-polar and cross-polar beam patterns of a qualification model of the ALMA band 8 cartridge cooled in a cartridge-test-cryostat have also been measured in the near-field as a detector of a submillimeter vector network analyzer. The measurements presented in this work refer to the lowest, middle and upper frequencies of band 8. The comparisons between software model and experimental measurements at these frequencies show good agreement down to -30 dB for the main polarization component. The cross-polarization level of the beam propagating through the receiver optics block was also characterized. We found that a cross-polarization level better than -28 dB can be achieved at all measured frequencies. The measured beam pattern of this receiver corresponds to efficiency of greater than 92% at the sub reflector (diameter of 750 mm) of the ALMA 12 m optics.
  SPRINGER, English, Scientific journal
  DOI：https://doi.org/10.1007/s10686-008-9136-3
  DOI ID：10.1007/s10686-008-9136-3, ISSN：0922-6435, eISSN：1572-9508, Web of Science ID：WOS:000265508300004
• Superconducting THz Camera with GaAs-JFET Cryogenic Readout Electronics　　　　　　　　　　　　　　　
  Hiroshi Matsuo; Yasunori Hibi; Toyoaki Suzuki; Masato Naruse; Takashi Noguchi; Yutaro Sekimoto; Yoshinori Uzawa; Hirohisa Nagata; Hirokazu Ikeda; Seiichiro Ariyoshi; Chiko Otani; Tom Nitta; Qi-jun Yao; Mikio Fujiwara
  LOW TEMPERATURE DETECTORS LTD 13, Volume：1185, First page：393, Last page：+, 2009
  We describe the development of large format array of superconducting tunnel junction detectors that is readout by SONY GaAs-JFET cryogenic integrated circuits. High quality SIS photon detectors have high dynamic impedance that can be readout by low gate leakage GaAs-JFET circuits. Our imaging array design, with niobium SIS photon detectors and GaAs-JFET cryogenics electronics, uses integrating amplifiers, multiplexers and shift-registers to readout large number of pixels that is similar to CMOS digital cameras. We have designed and fabricated GaAs-JFET cryogenic integrated circuits, such as AC-coupled capacitive trans-impedance amplifier, multiplexers with sample-and-holds and shift-registers, for 32-channel readout module. The Advanced Technology Center of National Astronomical Observatory of Japan have started extensive development program for large format array of SIS photon detectors.
  AMER INST PHYSICS, English, International conference proceedings
  DOI：https://doi.org/10.1063/1.3292360
  DOI ID：10.1063/1.3292360, ISSN：0094-243X, Web of Science ID：WOS:000281588500086
• Near-field Beam Pattern Measurement of ALMA Band 8 (385-500 GHz) First Cartridge　　　　　　　　　　　　　　　
  Masato Naruse; Yutaro Sekimoto; Mamoru Kamikura; Masahiro Sugimoto; Tetsuya Ito; Naohisa Satou; Kazuyoshi Kumagai; Yoshizo Iizuka; Yasuhiro Fujimoto
  2009 3RD EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION, VOLS 1-6, First page：2341, Last page：+, 2009
  In this paper, the optical performance of the ALMA Band 8 (385-500 GHz) cartridge receiver (S/N 01), which is the first one of 80 shipments, was investigated. ALMA Band 8 cartridge receiver consists of a corrugated horn, an Ortho-Mode Transducer, an elliptical mirror, a local oscillator, IF amplifiers, and superconducting-insulator-superconducting (SIS) mixers which cover IF frequency range from 4 to 8 GHz. The amplitude and phase of electric field at near-field were probed, and then the far-field co-polar and cross-polar patterns of the receiver were transferred. The far-field patterns are symmetrical, low side-lobe and compatible with physical optics simulations down to -30 dB. We confirmed that the aperture efficiency at sub-reflector of 12-m antenna are around 80 %-and cross-pol. efficiency are about 20 dB at five frequencies.
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000276522101099
• Design of SIS Imaging Array for Terahertz Astronomy　　　　　　　　　　　　　　　
  Masato Naruse; Yutaro Sekimoto; Toyoaki Suzuki; Yasunori Hibi; Hiroshi Matsuo; Yoshinori Uzawa; Takashi Noguchi
  2009 34TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, VOLS 1 AND 2, First page：526, Last page：+, 2009
  In this paper, the optical design of astronomical detector array with SIS for 600 - 700 GHz is proposed. A unit has 127 pixel, and SIS junctions are coupled to double slot antennas and extended hemisphere lens made from Silicon or Alumina ceramics. A lens with multi-pixel system is compared to 1 lens with 1 antenna system (fly-eye)from the view point of antenna spacing, aberration, and beam efficiency.
  IEEE, English, International conference proceedings
  Web of Science ID：WOS:000282796300263
• Development of ALMA Band 8 (385-500 GHz) cartridge　　　　　　　　　　　　　　　
  Y. Sekimoto; Y. Iizuka; N. Satou; T. Ito; K. Kumagai; M. Kamikura; M. Naruse; W. L. Shan
  Proceedings of the 19th International Symposium on Space Terahertz Technology, ISSTT 2008, First page：234, Last page：238, 2008
  We have developed a cartridge-type receiver covering from 385 to 500 GHz for pre-production of ALMA Band 8. It receives two orthogonal polarizations and down-converts the sideband-separated signals to intermediate frequencies (IF) between 4 and 8 GHz. The cartridge-type receiver consists of a cold optics, a feed horn, an OMT, two sideband-separating SIS mixers, cryogenic multipliers of local oscillator (LO). These components were individually tested and then the cartridge was integrated and tested as a complete assembly. We have also developed equipment to test both components and the integrated receiver. The single sideband (SSB) noise temperature of this receiver is 130 K at the band center and 180 K at the band edges. The beam pattern and cross-polarization pattern are consistent with physical optical calculation. These results are promising for receiver production to the Atacama Large Millimeter/submillimeter Array (ALMA).
  International conference proceedings
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  SCOPUS ID：84888046805
• Near-field beam and cross-polarization pattern measurement of ALMA band 8 cartridges　　　　　　　　　　　　　　　
  Masato Naruse; Mamoru Kamikura; Yutaro Sekimoto; Tetsuya Ito; Masahiro Sugimoto; Yoshizo Iizuka
  Proceedings of the 19th International Symposium on Space Terahertz Technology, ISSTT 2008, First page：498, Last page：503, 2008
  We measured corrugated horns, OMTs [1] (Orthomode Transducer), optics blocks at room temperature with a vector near field measurement system. The amplitude and phase measured at near-field are transformed to far-field pattern, and compared to calculations with Grasp 9 and CORRUG The co-polar beams were found to be consistent with the simulations at 385, 442, 500 GHz, and the calculated taper efficiency at the sub-reflector of ALMA 12-m antenna was greater than 92 %. Side lobe was less than-30 dB. The peak of cross-polar relative to co-polar found to be less than-20.5 dB. In addition, to evaluate accuracy of measurements, we studied both effects of standing wave and stability of the amplitude and phase. The error of the far-field was found to be less than 0.2dB between 0 and-20 dB range.
  International conference proceedings
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  SCOPUS ID：84888033729
• Development of a 385-500 GHz orthomode transducer (OMT)　　　　　　　　　　　　　　　
  Mamoru Kamikura; Masato Naruse; Shin'ichiro Asayama; Naohisa Satou; Wenlei Shan; Yutaro Sekimoto
  Proceedings of the 19th International Symposium on Space Terahertz Technology, ISSTT 2008, First page：521, Last page：526, 2008
  We report on the development of an orthomode transducer (OMT) for ALMA Band 8 (385-500 GHz). The OMT is a scaled model of that of ALMA Band 4 (125-163 GHz), which has a Bifot junction and a double ridge. The transmission loss of the OMT at 4 K was derived to be 0.4-0.5 dB from noise measurements with an SIS mixer. The polarization isolation was measured to be larger than 20 dB from quasioptical measurements. For electromagnetic design, effects of mechanical errors have been studied and then a robust design with allowable mechanical errors of 10 μm has been obtained.
  International conference proceedings
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  Scopus Citedby：https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=84888068140&origin=inward
  SCOPUS ID：84888068140

• Design of SFQ Control Circuit for Braiding Operation of Topological Quantum Bits (2)　　　　　　　　　　　　　　　
  大場来; 清水裕希; 成瀬雅人; 明連広昭
  電子情報通信学会大会講演論文集(CD-ROM), Volume：2024, 2024
  ISSN：1349-144X, J-Global ID：202402253298294051
• 850GHz帯域用MKID開発に向けたダブルスロットアンテナ設計　　　　　　　　　　　　　　　
  井上昴; 本多俊介; 永井誠; 村山洋佑; 松尾宏; 李豪純; 石崎悠治; 佐藤優馬; 新田冬夢; 久野成夫; 中井直正; 関本裕太郎; 成瀬雅人
  Volume：2024, 2024
  ISSN：1347-0639, J-Global ID：202402251482014452
• Detector aligenment and its evaluation in CMB telescope ′′GroundBIRD′′　　　　　　　　　　　　　　　
  片岡敬涼; 池満拓司; 石田秀郷; 石田秀郷; 石塚光; 内田智久; 内田智久; 大谷知行; 小栗秀悟; 唐津謙一; 唐津謙一; 木内健司; 沓間弘樹; 沓間弘樹; 小峯順太; 古谷野凌; 末野慶徳; 鈴木惇也; 関本裕太郎; 田井野徹; 武市宗一郎; 田島治; 田中智永; 辻悠汰; 辻悠汰; 辻井未来; 富田望; 永井誠; 長崎岳人; 成瀬雅人; 羽澄昌史; 羽澄昌史; 服部誠; 本多俊介; 美馬覚; 吉田光宏; 吉田光宏; CHOI Jihoon; GENOVA-SANTOS Ricardo Tanausu; JO Yonggil; LEE Kyungmin; PEEL Michael; REBOLO Rafael; RUBINO-MARTIN Jose Alberto; WON Eunil; FASANO Alessandro
  日本物理学会講演概要集(CD-ROM), Volume：79, Number：2, 2024
  ISSN：2189-079X, J-Global ID：202502244624757155
• Improving Sensitivity of Lumped Element Kinetic Inductance Detectors using TiN Thin Film　　　　　　　　　　　　　　　
  増岡佑人; 成瀬雅人; 明連広昭
  電子情報通信学会技術研究報告(Web), Volume：124, Number：243(SCE2024 4-11), 2024
  ISSN：2432-6380, J-Global ID：202502221383942006
• 100-GHz帯野辺山45m電波望遠鏡搭載用LeKIDカメラ:初期観測に向けた実験室での性能評価　　　　　　　　　　　　　　　
  石崎悠治; 本多俊介; 李豪純; 井上昴; 佐藤優馬; 新田冬夢; 久野成夫; CHEROU-VRIER Damien; CHEROU-VRIER Damien; MACIAS-PERES Juan; 永井誠; 村山洋佑; 松尾宏; 都築俊宏; 関本裕太郎; 中井直正; 成瀬雅人; MONFARDINI Alessandro
  Volume：2024, 2024
  ISSN：1347-0639, J-Global ID：202402280974720502
• Multiplexed readout of a superconducting detector array for rare phenomenon search and its data processing　　　　　　　　　　　　　　　
  千葉悠雅; 成瀬雅人; 市村晃一; 石徹白晃治; 明連広昭
  電子情報通信学会技術研究報告(Web), Volume：123, Number：234(SCE2023 12-22), 2023
  ISSN：2432-6380, J-Global ID：202402246430982859
• Detection of alpha rays by a dynamic inductance detector with an air-bridge structure　　　　　　　　　　　　　　　
  五十嵐洋介; 成瀬雅人; 和賀雄貴; 明連広昭
  電子情報通信学会技術研究報告(Web), Volume：123, Number：234(SCE2023 12-22), 2023
  ISSN：2432-6380, J-Global ID：202402220126107924
• Alpha-particle detection with airbridge implemented kinetic inductance detectors　　　　　　　　　　　　　　　
  五十嵐洋介; 成瀬雅人; 田井野徹; 明連広昭
  応用物理学会秋季学術講演会講演予稿集(CD-ROM), Volume：83rd, 2022
  ISSN：2758-4704, J-Global ID：202302252005973677
• 電波点回折干渉計のための超伝導回路を用いた相関型偏波計の試作に向けた設計　　　　　　　　　　　　　　　
  永井誠; 野地涼平; 今田大皓; 新田冬夢; 村山洋佑; 成瀬雅人
  Volume：2022, 2022
  ISSN：1347-0639, J-Global ID：202202284038287182
• Layout design of Digital SQUID with sub-SFQ feedback circuit　　　　　　　　　　　　　　　
  今谷純平; 成瀬雅人; 明連広昭
  電子情報通信学会技術研究報告(Web), Volume：121, Number：340(SCE2021 12-17), 2022
  ISSN：2432-6380, J-Global ID：202202210710432123
• Design of Superconducting Nanowire Photon Detector for Fluorescence Time Correlation Spectroscopy System　　　　　　　　　　　　　　　
  明連広昭; 渡邉輝; 和田秀斗; 成瀬雅人; 雨宮嘉照
  生体医歯工学共同研究拠点成果報告書, Volume：2021, 2022
  J-Global ID：202202227415248393
• 野辺山45m電波望遠鏡搭載用100-GHz帯109素子電波カメラの開発:実験室における雑音評価　　　　　　　　　　　　　　　
  村山洋佑; 新田冬夢; 永井誠; 鈴木隆司; 樋川遼太朗; 鈴木理花子; 野地涼平; 宮澤啓; 青木美和; 久野成夫; 中井直正; 関本裕太郎; 松尾宏; 江崎翔平; 宮地晃平; SHAN Wenlei; 都築俊宏; 野口卓; 成瀬雅人
  Volume：2022, 2022
  ISSN：1347-0639, J-Global ID：202202241426096565
• Al-Nb TiNハイブリッド型MKIDアレイを用いた100-GHz帯連続波カメラの野辺山45m電波望遠鏡搭載試験　　　　　　　　　　　　　　　
  宮澤啓; 新田冬夢; 永井誠; 村山洋佑; 野地涼平; ZHAI Guangyuan; MANDAL Pranshu; 鈴木隆司; 樋川遼太朗; 鈴木理花子; 青木美和; 久野成夫; 中井直正; 関本裕太郎; 松尾宏; 都築俊宏; 木内等; 福嶋美津広; 三ツ井健司; 江崎翔平; 宮地晃平; SHAN Wenlei; 野口卓; 成瀬雅人; 宮澤千栄子; 藤茂; 立松健一; 高橋敏一; 前川淳
  Volume：2022, 2022
  ISSN：1347-0639, J-Global ID：202202258114110415
• Effect of line width and quality factor on energy resolution of kinetic inductance detectors　　　　　　　　　　　　　　　
  Nagaoka Jun; Ando Tomohiko; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1865, Last page：1865, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1865
  DOI ID：10.11470/jsapmeeting.2021.1.0_1865, eISSN：2436-7613
• Development of superconducting radiation detectors embedded in air bridges　　　　　　　　　　　　　　　
  Waga Yuki; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1866, Last page：1866, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1866
  DOI ID：10.11470/jsapmeeting.2021.1.0_1866, eISSN：2436-7613
• Phase velocity control on a superconducting transmission line for sub-mm on-chip FTS　　　　　　　　　　　　　　　
  Yamaguchi Kouta; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1868, Last page：1868, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1868
  DOI ID：10.11470/jsapmeeting.2021.1.0_1868, eISSN：2436-7613
• Development of radiation camera with an array of 480 LEKIDs　　　　　　　　　　　　　　　
  Ninomiya Natsuko; Naruse Masato; Taino Toru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2021.1, First page：1867, Last page：1867, 26 Feb. 2021
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2021.1.0_1867
  DOI ID：10.11470/jsapmeeting.2021.1.0_1867, eISSN：2436-7613
• Braiding Operations of Topological Qubits Using SFQ Current Pulses　　　　　　　　　　　　　　　
  船澤卓朗; 成瀬雅人; 明連広昭
  電子情報通信学会技術研究報告(Web), Volume：121, Number：248(SCE2021 7-11), 2021
  ISSN：2432-6380, J-Global ID：202202260393198168
• Design of Stacked SQUID Output Amplifier for Digital SQUID Magnetometers　　　　　　　　　　　　　　　
  内田創坪; 今谷純平; 成瀬雅人; 明連広昭
  低温工学・超電導学会講演概要集, Volume：102nd (CD-ROM), 2021
  ISSN：0919-5998, J-Global ID：202202231253379008
• Design of DC/SFQ Gate with Low-Timing Jitter for SNSPD SFQ Readout Circuit　　　　　　　　　　　　　　　
  佐々木奨平; 成瀬雅人; 明連広昭
  低温工学・超電導学会講演概要集, Volume：102nd (CD-ROM), 2021
  ISSN：0919-5998, J-Global ID：202202285836000004
• Properties of substrate etched kinetic inductance detectors　　　　　　　　　　　　　　　
  Waga Yuki; Naruse Masato; Taino Tohru; Myoren Hiroaki
  JSAP Annual Meetings Extended Abstracts, Volume：2020.1, First page：2076, Last page：2076, 28 Feb. 2020
  The Japan Society of Applied Physics, Japanese
  DOI：https://doi.org/10.11470/jsapmeeting.2020.1.0_2076
  DOI ID：10.11470/jsapmeeting.2020.1.0_2076, eISSN：2436-7613
• Energy resolution independent of the linewidth of superconducting microresonators for alpha particle detectors　　　　　　　　　　　　　　　
  安藤 友彦; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：119, Number：369, First page：151, Last page：153, 16 Jan. 2020
  English
  ISSN：0913-5685, CiNii Articles ID：40022155941, CiNii Books ID：AN10012885
• Development for a spectrometer with superconducting devices-a characteriization system for MKIDs　　　　　　　　　　　　　　　
  末野慶徳; 田島治; 遠藤光; 唐津謙一; 成瀬雅人; 小栗秀悟
  日本物理学会講演概要集(CD-ROM), Volume：75, Number：1, 2020
  ISSN：2189-079X, J-Global ID：202002225629086525
• Al-NbTiNハイブリッドMKIDを用いた野辺山45m電波望遠鏡用100-GHz帯カメラの光学特性評価　　　　　　　　　　　　　　　
  樋川遼太朗; 新田冬夢; 永井誠; 村山洋佑; 村山洋佑; 鈴木隆司; MANDAL Pranshu; 久野成夫; 中井直正; 関本裕太郎; 松尾宏; 都築俊宏; 木内等; 福嶋美津広; 三ツ井健司; 江崎翔平; 宮地晃平; SHAN Wenlei; 野口卓; 成瀬雅人
  Volume：2020, 2020
  ISSN：1347-0639, J-Global ID：202002216268592663
• CMB偏光観測実験GroundBIRD-天体を用いた観測地での性能評価-　　　　　　　　　　　　　　　
  沓間弘樹; 沓間弘樹; 池満拓司; 石田秀郷; 石田秀郷; 石塚光; 内田智久; 内田智久; 大谷知行; 大谷知行; 岡田智香; 小栗秀悟; 唐津謙一; 官野史靖; 木内健司; 小峯順太; 古谷野凌; 鈴木惇也; 関本裕太郎; 瀬本宗久; 末野慶徳; 田井野徹; 田島治; 辻悠汰; 辻悠汰; 富田望; 永井誠; 長崎岳人; 成瀬雅人; 羽澄昌史; 羽澄昌史; 服部誠; 本多俊介; 蓑輪眞; 美馬覚; 吉田光宏; 吉田光宏; CHOI Jihoon; GENOVA-SANTOS Ricardo T.; JO Yonggil; LEE Kyungmin; MOON Joonhyeok; PEEL Michael; REBOLO Rafael; RUBINO-MARTIN Jose Alberto; WON Eunil
  Volume：2020, 2020
  ISSN：1347-0639, J-Global ID：202002218303211218
• 野辺山45m電波望遠鏡搭載用100-GHz帯電波カメラの多素子同時読み出しシステムを用いた感度評価　　　　　　　　　　　　　　　
  鈴木隆司; 永井誠; 新田冬夢; 村山洋佑; 村山洋佑; 樋川遼太朗; MANDAL Pranshu; 久野成夫; 中井直正; 関本裕太郎; 松尾宏; 都築俊宏; 木内等; 福嶋美津広; 三ツ井健司; 江崎翔平; 宮地晃平; SHAN Wenlei; 野口卓; 成瀬雅人
  Volume：2020, 2020
  ISSN：1347-0639, J-Global ID：202002269623507114
• Design of High Timing resolution Time-to-Digital Convertor for Time-Resolving Photon Detection System using SNSPD　　　　　　　　　　　　　　　
  明連 広昭; 神谷 遼太郎; 會田 晃太; 成瀬 雅人; 田井野 徹; 康 琳; 陳 健; 呉 培亨
  Volume：119, Number：219, First page：23, Last page：26, 09 Oct. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40022064450, CiNii Books ID：AN10012885
• 高Jcプロセスを用いたSFQ論理によるディジタルSQUID磁束計の性能評価 (超伝導エレクトロニクス)　　　　　　　　　　　　　　　
  板垣 航希; 松縄 諒; 大嶋 一太; 長谷川 雄一; 成瀬 雅人; 田井野 徹; 明連 広昭; Okabe Kosuke
  Volume：119, Number：164, First page：49, Last page：53, 09 Aug. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021996943, CiNii Books ID：AN10012885
• Implementation of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  明連 広昭; 松繩 諒; 板垣 航希; 大嶋 一太; 長谷川 雄一; 成瀬 雅人; 田井野 徹
  Volume：119, Number：10, First page：33, Last page：38, 19 Apr. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021885399, CiNii Books ID：AN10012885
• Crosstalk evaluation of lumped element kinetic inductance detectors　　　　　　　　　　　　　　　
  桒田 正博; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：118, Number：415, First page：1, Last page：5, 23 Jan. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021801129, CiNii Books ID：AN10012885
• サブ磁束量子フィードバックデジタルSQUID磁束計 : 高速化・小規模回路化に関する検討 (超伝導エレクトロニクス)　　　　　　　　　　　　　　　
  板垣 航希; 大嶋 一太; 長谷川 雄一; 松縄 諒; 岡部 公亮; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：118, Number：415, First page：7, Last page：11, 23 Jan. 2019
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021801158, CiNii Books ID：AN10012885
• 野辺山45m電波望遠鏡搭載用100-GHz帯109素子電波カメラの開発:焦点面MKIDアレイのAl-NbTiNハイブリッド化　　　　　　　　　　　　　　　
  永井誠; 新田冬夢; 村山洋佑; 鈴木隆司; 樋川遼太朗; MANDAL Pranshu; 久野成夫; 中井直正; 関本裕太郎; 松尾宏; 江崎翔平; 宮地晃平; SHAN Wenlei; KROUG Matthias; 都築俊宏; 木内等; 福嶋美津広; 三ツ井健司; 野口卓; 成瀬雅人
  Volume：2019, 2019
  ISSN：1347-0639, J-Global ID：201902220616649896
• 半導体基板上に実現するオンチップ広帯域バンドパスフィルターの設計　　　　　　　　　　　　　　　
  陳家偉; 竹腰達哉; 宇野慎介; 河野孝太郎; 大島泰; 川邊良平; 小野哲; 吉岡佳輔; 酒井剛; 成瀬雅人; 美馬覚
  Volume：2019, 2019
  ISSN：1347-0639, J-Global ID：201902215350820496
• CMB観測実験GroundBIRDにおける最終試験ならびに観測サイト整備状況　　　　　　　　　　　　　　　
  長崎岳人; CHOI Jihoon; GENOVA-SANTOS Ricardo T.; GENOVA-SANTOS Ricardo T.; 服部誠; 羽澄昌史; 羽澄昌史; 本多俊介; 池満拓司; 石田秀郷; 石田秀郷; 石塚光; JO Yonggil; 唐津謙一; 木内健司; 小峯順太; 古谷野凌; 沓間弘樹; 沓間弘樹; LEE Kyungmin; 美馬覚; 箕輪眞; MOON Joonhyeok; 永井誠; 成瀬雅人; 小栗秀悟; 大谷知行; PEEL Michael; REBOLO Rafael; REBOLO Rafael; REBOLO Rafael; RUBINO-MARTIN Jose A.; RUBINO-MARTIN Jose A.; 関本裕太郎; 鈴木惇也; 田井野徹; 田島治; 富田望; 内田智久; 内田智久; WON Eunil; 吉田光宏; 吉田光宏
  Volume：2019, 2019
  ISSN：1347-0639, J-Global ID：201902214893240702
• 野辺山45m電波望遠鏡搭載用100-GHz帯109素子電波カメラの開発:柱状晶Siレンズおよび真空窓の反射防止対策　　　　　　　　　　　　　　　
  新田冬夢; 永井誠; 村山洋佑; 樋川遼太朗; 鈴木隆司; MANDAL Pranshu; 久野成夫; 中井直正; 関本裕太郎; 高倉隼人; 長谷部孝; 松尾宏; 都築俊宏; 木内等; 福嶋美津広; 三ツ井健司; 江崎翔平; 宮地晃平; SHAN Wenlei; 野口卓; 成瀬雅人
  Volume：2019, 2019
  ISSN：1347-0639, J-Global ID：201902261730314755
• CMB偏光観測実験GroudBIRD望遠鏡の検出器の応答性評価　　　　　　　　　　　　　　　
  沓間弘樹; 沓間弘樹; 池満拓司; 石塚光; 内田智久; 内田智久; 大谷知行; 岡田智香; 小栗秀悟; 唐津謙一; 官野史靖; 木内健司; 小峯順太; 古谷野凌; 鈴木惇也; 関本裕太郎; 瀬本宗久; 田井野徹; 田島治; 富田望; 永井誠; 長崎岳人; 成瀬雅人; 羽澄昌史; 羽澄昌史; 服部誠; 本多俊介; 蓑輪眞; 美馬覚; 吉田光宏; 吉田光宏; GENOVA-SANTOS Ricardo T.; CHOI Jihoon; LEE Kyungmin; REBOLO Rafael; RUBINO-MARTIN Jose Alberto; WON Eunil
  Volume：2019, 2019
  ISSN：1347-0639, J-Global ID：201902233672302971
• Comparison of photon-number-resolving detectors using superconducting nanowire　　　　　　　　　　　　　　　
  明連 広昭; 神谷 遼太郎; 傳田 哲史; 寺井 誠; 成瀬 雅人; 田井野 徹; 康 琳; 陳 健; 呉 培亨
  Volume：118, Number：233, First page：7, Last page：12, 10 Oct. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021713682, CiNii Books ID：AN10012885
• Design of sub-Flux Quantum Feedback Digital SQUID Magnetometer with First-order Sinc Filter　　　　　　　　　　　　　　　
  松縄 諒; 岡部 公亮; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：118, Number：178, First page：13, Last page：17, 09 Aug. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021657530, CiNii Books ID：AN10012885
• Superconducting resonators relying on high-Tc materials for Gamma ray detectors　　　　　　　　　　　　　　　
  成瀬 雅人; 久保田 立記; 田井野 徹; 明連 広昭
  Volume：118, Number：11, First page：23, Last page：27, 20 Apr. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021538293, CiNii Books ID：AN10012885
• Design of Digital Filter for Digital SQUID with sub-Flux Quantum Feedback Resolution　　　　　　　　　　　　　　　
  松繩 諒; 岡部 公亮; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：117, Number：428, First page：7, Last page：11, 31 Jan. 2018
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021464376, CiNii Books ID：AN10012885
• 野辺山45m電波望遠鏡搭載用100-GHz帯電波カメラの光学評価　　　　　　　　　　　　　　　
  村山洋佑; 新田冬夢; 服部将吾; 久野成夫; ZHAI Guangyuan; MANDAL Pranshu; 奥村大志; 中井直正; 永井誠; 松尾宏; 都築俊宏; 福嶋美津広; 三ツ井健司; 江崎翔平; 宮地晃平; 関本裕太郎; 野口卓; 成瀬雅人
  Volume：2018, 2018
  ISSN：1347-0639, J-Global ID：201802268455398236
• DESHIMA:新技術「超伝導オンチップ・フィルターバンク」による初の天体スペクトル検出　　　　　　　　　　　　　　　
  遠藤光; THOEN David; YURDUSEVEN Ozan; BOSMA Sjoerd; LLOMBART Nuria; KLAPWIJK Teun; 唐津謙一; HUITING Robert; MURUGESAN Vignesh; YATES Stephen; BASELMANS Jochem; VAN DER WERF Paul; 石田剛; 谷口暁星; 竹腰達哉; 河野孝太郎; 大島泰; 石井峻; 陳家偉; 前川淳; 川邊良平; 木挽俊彦; 浅山信一郎; 鈴木向陽; 上田哲太朗; 田村陽一; 成瀬雅人; 藤田和之; 香内晃; 中坪俊一; BAKX Tom
  Volume：2018, 2018
  ISSN：1347-0639, J-Global ID：201802246207343698
• DESHIMA:DE:CODEによるDESHIMA性能評価　　　　　　　　　　　　　　　
  鈴木向陽; 田村陽一; 上田哲太朗; 遠藤光; THOEN David; VAN MARREWIJK Nuri; YURDUSEVEN Ozan; BOSMA Sjoerd; LLOMBART Nuria; 谷口暁星; 石田剛; 竹腰達哉; 河野孝太郎; 陳家偉; 石井峻; 大島泰; 前川淳; 川邊良平; 成瀬雅人; BAKX Tom; 唐津謙一; MURUGESAN Vignesh; BUENO Juan; YATES Stephen; BASELMANS Jochem; VAN DER WERF Paul
  Volume：2018, 2018
  ISSN：1347-0639, J-Global ID：201802274860379607
• DESHIMA:搭載試験の全観測データを対象とした詳細性能評価　　　　　　　　　　　　　　　
  谷口暁星; 鈴木向陽; 田村陽一; 上田哲太朗; 遠藤光; THOEN David; BOSMA Sjoerd; LLOMBART Nuria; 石田剛; 竹腰達哉; 河野孝太郎; 塚越崇; 陳家偉; 石井峻; 大島泰; 前川淳; 川邊良平; 鈴木惇也; 成瀬雅人; BAKX Tom; 唐津謙一; MURUGESAN Vignesh; YATES Stephen; BASELMANS Jochem; VAN DER WERF Paul
  Volume：2018, 2018
  ISSN：1347-0639, J-Global ID：201802229251654163
• ミリ波サブミリ波多色カメラに用いるオンチップ広帯域フィルターの開発　　　　　　　　　　　　　　　
  陳家偉; 大島泰; 吉岡佳輔; 川邊良平; 小野哲; 酒井剛; 竹腰達哉; 宇野慎介; 美馬覚; 成瀬雅人
  Volume：38th, 2018
  J-Global ID：202002211788936955
• 大角度スケールCMB偏光観測実験GroundBIRD-回転読み出し性能評価　　　　　　　　　　　　　　　
  長崎岳人; CHOI Jihoon; GENOVA-SANTOS Ricardo T.; 服部誠; 羽澄昌史; 羽澄昌史; 石塚光; 唐津謙一; 官野史靖; 木内健司; 小峯順太; 古谷野凌; 沓間弘樹; LEE Kyungmin; 美馬覚; 永井誠; 成瀬雅人; 岡田智香; 小栗秀悟; REBOLO Rafael; RUBINO-MARTIN Jose A.; 関本裕太郎; 鈴木惇也; 瀬本宗久; 田井野徹; 田島治; 富田望; 内田智久; 内田智久; WON Eunil; 吉田光宏; 吉田光宏
  Volume：2018, 2018
  ISSN：1347-0639, J-Global ID：201802217760517422
• Applications of high-speed photon-number-resolving SNSPD array　　　　　　　　　　　　　　　
  明連 広昭; 大田 一喜; 傳田 哲史; 成瀬 雅人; 田井野 徹; 康 琳; 陳 健; 呉 培亨
  Volume：117, Number：223, First page：23, Last page：28, 04 Oct. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021374188, CiNii Books ID：AN10012885
• Design of Digital SQUID using sub-SFQ Feedback with High Sampling Rate　　　　　　　　　　　　　　　
  岡部 公亮; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：117, Number：171, First page：49, Last page：53, 09 Aug. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021317932, CiNii Books ID：AN10012885
• Design of Low-latency SFQ Up/Down Counter for Digital Signal Processing　　　　　　　　　　　　　　　
  神谷 遼太郎; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：117, Number：171, First page：55, Last page：59, 09 Aug. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021317973, CiNii Books ID：AN10012885
• Design and Applications of Digital SQUID Magnetometer with Sub-Flux Quantum Feedback　　　　　　　　　　　　　　　
  明連 広昭; 岡部 公亮; 神谷 遼太郎; 成瀬 雅人; 田井野 徹
  Volume：117, Number：10, First page：1, Last page：5, 21 Apr. 2017
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40021187002, CiNii Books ID：AN10012885
• DESHIMA:超伝導オンチップ・フィルターバンクを用いたサブミリ波超広帯域分光器の研究開発　　　　　　　　　　　　　　　
  遠藤光; 唐津謙一; THOEN David; VAN MARREWIJK Nuri; YURDUSEVEN Ozan; BOSMA Sjoerd; LLOMBART Nuria; MURUGESAN Vignesh; BUENO Juan; YATES Stephen; BASELMANS Jochem; VAN DER WERF Paul; 成瀬雅人; 富田望; 谷口暁星; 田村陽一; 河野孝太郎; 石井峻; 前川淳; 竹腰達哉; 川邊良平; 大島泰
  Volume：2017, 2017
  ISSN：1347-0639, J-Global ID：201702283147985142
• 高速回転変調による大角度スケールのCMB偏光観測-GroundBIRD実験　　　　　　　　　　　　　　　
  長崎岳人; CHOI Jihoon; GENOVA-SANTOS Ricardo T.; GENOVA-SANTOS Ricardo T.; 服部誠; 羽澄昌史; 羽澄昌史; 石塚光; 唐津謙一; 木内健司; 古谷野凌; 沓間弘樹; LEE Kyungmin; 美馬覚; 永井誠; 成瀬雅人; 小栗秀悟; REBOLO Rafael; REBOLO Rafael; REBOLO Rafael; RUBINO-MARTIN Jose A.; RUBINO-MARTIN Jose A.; 関本裕太郎; 鈴木純也; 田井野徹; 田島治; 田島治; 富田望; 内田智久; 内田智久; WON Eunil; 吉田光宏; 吉田光宏
  Volume：2017, 2017
  ISSN：1347-0639, J-Global ID：201702237177451864
• Development of Millimeter-wave Horn Coupled OMT-MKID camera
  Sekimoto Yutaro; Nitta Tom; Murayama S.; Hattori S.; Nagai M.; Dominjon Agnes; Shan Wenlei; Hasebe T.; Kiuchi H.; Matsuo H.; Noguchi T.; Sekiguchi S.; Shu Shibo; Shimizu T.; Naruse M.; Kawasaki S.; Mita M.; Miyachi Akihira
  Dec. 2016
  4th Workshop of Nano-Electronics For Space Use (December 15, 2016. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
  Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS), Japanese
  CiNii Articles ID：120006832188
• Photon-Number Resolving SNSPD Array with SFQ Amplifier Circuit　　　　　　　　　　　　　　　
  大田 一喜; 成瀬 雅人; 田井野 徹; 康 琳; 陳 健; 呉 培亨; 明連 広昭
  Volume：116, Number：269, First page：43, Last page：46, 26 Oct. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020991413, CiNii Books ID：AN10012885
• THz wave detection using the substrate absorption type STJ with a position resolution　　　　　　　　　　　　　　　
  曽根 雅彦; 五十嵐 直樹; 成瀬 雅人; 明連 広昭; 佐々木 芳彰; 大谷 知行; 田井野 徹
  Volume：116, Number：175, First page：1, Last page：4, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932079, CiNii Books ID：AN10012885
• Fabrication and Evaluation of Superconducting Tunnel Junctions with Embedded Coil for Applying Magnetic Field　　　　　　　　　　　　　　　
  酒井 功樹; 山口 兼司; 仲川 博; 青柳 昌宏; 成瀬 雅人; 明連 広昭; 田井野 徹
  Volume：116, Number：175, First page：5, Last page：8, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932093, CiNii Books ID：AN10012885
• Improvement of fabrication and characterization for embedded STJ　　　　　　　　　　　　　　　
  森田 浩平; 松本 功; 青柳 昌宏; 成瀬 雅人; 明連 広昭; 田井野 徹
  Volume：116, Number：175, First page：9, Last page：12, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932115, CiNii Books ID：AN10012885
• Development of the Radiation Detector Array Using High-temperature Superconductor　　　　　　　　　　　　　　　
  久保田 立記; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：116, Number：175, First page：13, Last page：17, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932118, CiNii Books ID：AN10012885
• NbN Parallel-Serial Type Superconducting Nanowire Single Photon Detector for High Speed Response　　　　　　　　　　　　　　　
  前田 優; 塩島 俊也; 成瀬 雅人; 田井野 徹; 明連 広昭
  Volume：116, Number：175, First page：41, Last page：44, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932272, CiNii Books ID：AN10012885
• Development of Broadband Microstrip Crossover for Millimeter-Wave　　　　　　　　　　　　　　　
  増田 聖; 成瀬 雅人; 田井野 徹; 明連 広昭; 関本 裕太郎; 新田 冬夢
  Volume：116, Number：175, First page：25, Last page：28, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932195, CiNii Books ID：AN10012885
• The development of the air-bridge structure of the coplanar waveguide for millimeter-wave band　　　　　　　　　　　　　　　
  伊藤 和雅; 成瀬 雅人; SHU SHIBO; 関本 裕太郎; 新田 冬夢; 田井野 徹; 明連 広昭
  Volume：116, Number：175, First page：29, Last page：33, 08 Aug. 2016
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020932221, CiNii Books ID：AN10012885
• C-8-2 Digital SQUID using DROS Comparator with Relaxation Oscillation Circuit　　　　　　　　　　　　　　　
  Kobayashi Ryota; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2016, Number：2, First page：30, Last page：30, 01 Mar. 2016
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110010026112, CiNii Books ID：AN10471452
• C-8-14 Design of SFQ up/down counter for Photon-number-Resolving SNSPDs　　　　　　　　　　　　　　　
  Kumagai Kenji; Naruse Masato; Taino Toru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2016, Number：2, First page：42, Last page：42, 01 Mar. 2016
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110010026124, CiNii Books ID：AN10471452
• ミリ波帯用コプレナー導波路へのエアブリッジ構造の開発　　　　　　　　　　　　　　　
  伊藤和雅; 成瀬雅人; 田井野徹; 明連広昭; 関本裕太郎; 新田冬夢
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602208492346974
• 野辺山45m電波望遠鏡搭載に向けた広帯域超伝導カメラ冷却光学系の開発　　　　　　　　　　　　　　　
  山田淑乃; 新田冬夢; 中井直正; 久野成夫; 永井誠; 今田大皓; 久松俊輔; 関本裕太郎; 三ツ井健司; 岡田則夫; 福嶋美津広; 都築俊宏; 野口卓; 松尾宏; AGNES Dominjon; 関根正和; 関口繁之; SHU Shibo; 成瀬雅人
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602217616073113
• 南極10mテラヘルツ望遠鏡搭載用超伝導電波カメラの機械熱設計　　　　　　　　　　　　　　　
  村山洋佑; 新田冬夢; 中井直正; 久野成夫; 永井誠; 関本裕太郎; 都築俊宏; 関口繁之; SHU Shibo; 今田大皓; 瀬田益道; 成瀬雅人
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602214771879054
• 野辺山45m電波望遠鏡搭載に向けた90/150-GHz帯MKIDカメラの開発　　　　　　　　　　　　　　　
  新田冬夢; 中井直正; 久野成夫; 永井誠; 村山洋佑; 関本裕太郎; 福嶋美津広; 三ツ井健司; 都築俊宏; 野口卓; 松尾宏; DOMINJON Agnes; SHAN Wenlei; 長谷部孝; 関口繁之; SHU Shibo; 清水貴之; 成瀬雅人; 伊藤和雅; 増田聖; 川崎繁男; 宮地晃平; 岡田則夫
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602268005688670
• 広視野サブミリ波MKIDカメラの開発　　　　　　　　　　　　　　　
  関本裕太郎; DOMINJON Agnes; 長谷部孝; 野口卓; 松尾宏; SHAN Wenlei; 木内等; 岡田則夫; 都築俊宏; 福嶋美津広; 三ツ井健司; 関口繁之; 関口繁之; 清水貴之; 清水貴之; 新田冬夢; 永井誠; 成瀬雅人; 川崎繁男; 宮地晃平
  Volume：26th, 2016
  J-Global ID：201702288262038505
• LiteBIRD MKID焦点面検出器の設計　　　　　　　　　　　　　　　
  関本裕太郎; 野口卓; SHAN Wenlei; AGNES Dominjon; 関根正和; 関口繁之; SHU Shibo; 成瀬雅人; 新田冬夢; 川崎繁男; 三田信; 宮地晃平
  Volume：2016, 2016
  ISSN：1347-0639, J-Global ID：201602209008739220
• Noise properties of digital SQUID using DROS comparator with relaxation oscillation resonant circuit　　　　　　　　　　　　　　　
  小林 亮太; 成瀬 雅人; 田井野 徹
  Volume：115, Number：173, First page：63, Last page：68, 04 Aug. 2015
  Japanese
  ISSN：0913-5685, CiNii Articles ID：40020588805, CiNii Books ID：AN10012885
• Superconducting Microresonators for Gamma-ray Detection　　　　　　　　　　　　　　　
  NARUSE Masato; MIYAMOTO Noriaki; TAINO Tohru; MYOREN Hiroaki
  Technical report of IEICE. SCE, Volume：114, Number：247, First page：39, Last page：42, 15 Oct. 2014
  We propose a high spatial resolution gamma ray camera with superconducting resonator arrays for food screening systems. The gamma ray camera is composed of hundreds of microwave resonators. Absorbers are attached to the reverse side of the wafer. The gamma-rays create phonons in the absorber and the resonators detect the phonons propagated from the absorber. As a first step for the proposed camera, we measured 10 lumped element kinetic inductance detectors (LeKIDs) in a 0.3-K sorption cryostat. The event rate of the pixel with the Pb absorber was approximately 5 cps and 6 times higher than that of the pixel without the absorber. The rise and the fall time of events were less than the 1.1 MHz sampling of a vector network analyzer.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009959085, CiNii Books ID：AN10012885
• C-8-1 Design of Digital SQUID Magnetometer with sub-Flux Quantum Resolution　　　　　　　　　　　　　　　
  Takatoku Kouhei; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2014, Number：2, First page：15, Last page：15, 09 Sep. 2014
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009882127, CiNii Books ID：AN10489017
• C-8-14 Design of 8-bit low-energy SFQ Up/Down counter for Digital SQUID　　　　　　　　　　　　　　　
  Zhang Bing; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2014, Number：2, First page：28, Last page：28, 09 Sep. 2014
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009882210, CiNii Books ID：AN10489017
• C-8-12 Photon number resolving SNSPD detector using SQF digital SQUID readout　　　　　　　　　　　　　　　
  Takeda Shunsuke; Naruse Masato; Taino Tohru; Myoren Hiroaki; Chen Jian; Wu Peiheng
  Proceedings of the IEICE General Conference, Volume：2014, Number：2, First page：43, Last page：43, 04 Mar. 2014
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009828254, CiNii Books ID：AN10471452
• Effect of quasiparticles in the intra-gap states on the property of superconducting resonators　　　　　　　　　　　　　　　
  NOGUCHI Takashi; NARUSE Masato; SEKINE Masakazu; KARATSU Ken'ichi; SEKIMOTO Yutaro
  Technical report of IEICE. SCE, Volume：113, Number：401, First page：67, Last page：72, 23 Jan. 2014
  We propose a hypothesis that there are a few numbers of quasiparticle states inside the energy gap and analyze the surface resistance and the Q-values of a resonator of superconductor using the hypothesis. The conventional Mattis-Bardeen theory is extended by introducing the complex number of the superconducting gap energy, which well predicts the magnitude of the quasiparticle density of states inside the energy gap. Using the extended Mattis-Bardeen theory, the surface resistance of superconductors and the Q-value of superconducting resonators are calculated. It is shown that simulated temperature dependence of the surface resistance and Q-value of a superconductor agree very well with the experimental results. It is also demonstrated that the calculated residual quasiparticle number of a superconducting resonator using the density of states, which is obtained from the fitting of a dc I-V curve of SIS tunnel junction, quantitatively agrees with the measured one.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009822123, CiNii Books ID：AN10012885
• Development of Nb/Al bi-layer MKID camera : Temperature dependence of quality factor　　　　　　　　　　　　　　　
  Sekine Msakazu; Sekimoto Yutaro; Noguchi Takashi; Miyachi Akihira; Karatsu Ken'ichi; Nitta Tom; Sekiguti Shigeyuki; Naruse Masato
  Technical report of IEICE. SCE, Volume：113, Number：401, First page：73, Last page：77, 23 Jan. 2014
  Microwave Kinetic Inductance Detector (MKID) camera has been developed at National Astronomical Observatory of Japan for millimeter-wave and terahertz astronomy. MKID composed of superconducting resonators can sense a number of quasi-particles which incident photons above the gap energy generate by breaking Cooper pairs. A bi-layer MKID such as Al/Nb is attractive because the gap energy or the threshold frequency is easily changed due to proximity effect. It is quite useful for space observatory or a remote site such as the Antarctica where power consumption of cryocoolers is severely limited. We report high quality resonators of bi-layer (Al/Nb) MKIDs fabricated by liftoff technique. And we found temperature dependence of bi -layer MKID quality factor showed different behavior as Al or Nb monolayer.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009822124, CiNii Books ID：AN10012885
• 南極10mテラヘルツ望遠鏡搭載用850GHz帯超伝導カメラの基本設計　　　　　　　　　　　　　　　
  新田冬夢; 関本裕太郎; 都築俊宏; 唐津謙一; 三ツ井健司; 岡田則夫; 野口卓; 関口繁之; 関根正和; 岡田隆; SHU Shibo; 成瀬雅人; 今田大皓; 瀬田益道; 中井直正
  Volume：2014, 2014
  ISSN：1347-0639, J-Global ID：201402242166665758
• Design of SFQ digital circuit for photon number resolving detector using SNSPD　　　　　　　　　　　　　　　
  TAKEDA Sunsuke; NARUSE Masato; TAINO Tohru; MYOREN Hiroaki; CHEN Jian; WU Peiheng
  Technical report of IEICE. SCE, Volume：113, Number：232, First page：83, Last page：87, 02 Oct. 2013
  Superconducting nanowire single photon detectors (SNSPDs), those have a low dark count rate characteristics, fast and low jittering response, and high quantum efficiency, are expected to be used in the quantum information field and time-of-flight (TOF) mass spectrometry etc. A readout circuit using superconducting single-flux-quantum (SFQ) logic circuits has been developed to realize fast and low-jittering readout for an array of SNSPDs. SNSPDs with series-parallel meander type configurations have been demonstrated to have photon number resolving capabilities and are expected to be used for an evaluation system of single photon generators and/or an energy-dissolved fast detector for new generation TOF mass spectrometry. In this study, we present design, fabrication and confirmation of correct operations of an SFQ digital readout circuit for an SNSPD with series-parallel meander type configuration.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009815147, CiNii Books ID：AN10012885
• Development of Microwave Kinetic Inductance Detector for Observation of the Cosmic Microwave Background　　　　　　　　　　　　　　　
  Karatsu Kenichi; Naruse Masato; Nitta Tomu; Sekine Masakazu; Sekiguchi Shigeyuki; Okada Takashi; Sekimoto Yutaro; Noguchi Takashi; Uzawa Yoshinori; Matsuo Hiroshi; Kiuchi Hitoshi
  Technical report of IEICE. SCE, Volume：113, Number：232, First page：21, Last page：25, 02 Oct. 2013
  The development of Microwave Kinetic Inductance Detector (MKID) camera has been carried out at National Astronomical Observatory of Japan (NAOJ), aiming for a measurement of the B-mode polarization of the Cosmic Microwave Background (CMB) which is unique probe for the inflation era in early universe. The developed technologies and the current status at NAOJ are reported in this paper.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009815136, CiNii Books ID：AN10012885
• Design of SFQ logic cells with magnetic shield structure for digital SQUID　　　　　　　　　　　　　　　
  Nakagawa Hironori; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the Society Conference of IEICE, Volume：2013, Number：2, First page：25, Last page：25, 03 Sep. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009735804, CiNii Books ID：AN10489017
• Design of SFQ circuit for photon number resolving detector using parallel SNSPD　　　　　　　　　　　　　　　
  Takeda Shunsuke; Naruse Masato; Taino Tohru; Myoren Hiroaki; Che Jian Che; Wu Peiheng
  Proceedings of the Society Conference of IEICE, Volume：2013, Number：2, First page：26, Last page：26, 03 Sep. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009735805, CiNii Books ID：AN10489017
• Superconducting Micro-resonator arrays for High Sensitivity Terahertz-wave Cameras　　　　　　　　　　　　　　　
  NARUSE Masato; WATANABE Yoshiharu; NUNOKAWA Yuma; TAINO Tohru; MYOREN Hiroaki
  Technical report of IEICE. SCE, Volume：113, Number：11, First page：21, Last page：25, 19 Apr. 2013
  We have been developing terahertz cameras using superconducting micro-resonator arrays operated at 4K. A superconducting micro resonator, called Microwave Kinetic Inductance Detector(MKID), is one of the most sensitive detectors for terahertz wave. MKID is made from a Niobium Nitride films whose superconducting transition temperature is 15.7K with the thickness of 150nm. The film is deposited on an MgO substrate by magnetron sputtering method. To increase the number of detectors per area, we estimate the amount of microwave crosstalk between pixels with Ansys Designer. We find that the pixel crosstalk occurs by both inductive and capacitive coupling.
  The Institute of Electronics, Information and Communication Engineers, Japanese
  ISSN：0913-5685, CiNii Articles ID：110009768239, CiNii Books ID：AN10012885
• C-8-12 Coupled SQUID comparator for STJ Photon Detectors　　　　　　　　　　　　　　　
  Murashige Takuya; Naruse Masato; Taino Tohru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2013, Number：2, First page：43, Last page：43, 05 Mar. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009767081, CiNii Books ID：AN10471452
• C-8-13 Time-Domain Multiplexing for STJ Array Detectors　　　　　　　　　　　　　　　
  Kobayashi Yuta; Sasaki Ryo; Naruse Masato; Taino Toru; Myoren Hiroaki
  Proceedings of the IEICE General Conference, Volume：2013, Number：2, First page：44, Last page：44, 05 Mar. 2013
  The Institute of Electronics, Information and Communication Engineers, Japanese
  CiNii Articles ID：110009767082, CiNii Books ID：AN10471452
• 25pGF-4 宇宙背景放射偏光観測のための多素子超伝導体共振器カメラの開発と実験室での実証試験(25pGF 宇宙線・宇宙物理領域,素粒子実験領域合同,宇宙背景幅射(CMB),宇宙線・宇宙物理領域)　　　　　　　　　　　　　　　
  唐津 謙一; 成瀬 雅人; 新田 冬夢; 関根 正和; 関本 裕太郎; 野口 卓; 鵜澤 佳徳; 松尾 宏; 木内 等
  Volume：67, Number：0, First page：135, Last page：135, 2012
  Japanese
  DOI ID：10.11316/jpsgaiyo.67.1.1.0_135_3, ISSN：1342-8349, CiNii Articles ID：110009565317, CiNii Books ID：AA11439205
• 超伝導サブミリ波カメラの大規模アレイ化へ向けて　　　　　　　　　　　　　　　
  松尾宏; 日比康詞; 鈴木仁研; 関本裕太郎; 野口卓; 鵜澤佳徳; 成瀬雅人; 新田冬夢; 永田洋久; 池田博一; 有吉誠一郎; 大谷知行; YAO Qi-jun; 藤原幹生
  Volume：2009, 2009
  ISSN：1347-0639, J-Global ID：200902293432331414

• テラヘルツ波の発生、検出、制御技術と最新応用　　　　　　　　　　　　　　　
  技術情報協会; 貴田, 徳明
  Jul. 2024
  Japanese, Total pages：566p
  CiNii Books：http://ci.nii.ac.jp/ncid/BD08523019
  ISBN：9784867980286, CiNii Books ID：BD08523019

• Apr. 2015 - Present
• Apr. 2014 - Present
• Jun. 2009 - Present

• 超伝導技術によるテラヘルツ波スペクトルアナライザの実現　　　　　　　　　　　　　　　
  01 Apr. 2021 - 31 Mar. 2024
  Grant amount(Total)：4160000, Direct funding：3200000, Indirect funding：960000
  Grant number：21K04132
• 超伝導量子計測を使った電波分光で探る超軽量ダークマター - その実験手法の確立　　　　　　　　　　　　　　　
  28 Jun. 2019 - 31 Mar. 2023
  Grant amount(Total)：25740000, Direct funding：19800000, Indirect funding：5940000
  Grant number：20K20427
• エアブリッジインダクタンスによる超伝導力学インダクタンス検出器の高感度化　　　　　　　　　　　　　　　
  01 Apr. 2020 - 31 Mar. 2022
  Grant amount(Total)：5980000, Direct funding：4600000, Indirect funding：1380000
  Grant number：20H05244
• Study of cosmic star formation history based on an unbiased survey of mm/submm-wave emission line galaxies　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S), Grant-in-Aid for Scientific Research (S), 31 May 2017 - 31 Mar. 2022
  The University of Tokyo
  Grant amount(Total)：212810000, Direct funding：163700000, Indirect funding：49110000
  Grant number：17H06130
• Study of growth process of dust-enshrouded super-massive blackholes　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), 01 Apr. 2017 - 31 Mar. 2018
  The University of Tokyo
  Grant amount(Total)：43940000, Direct funding：33800000, Indirect funding：10140000
  Grant number：17H01108
• Development of submillimeter-wave 2000 pixel camera　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), 01 Apr. 2013 - 31 Mar. 2017
  Sekimoto Yutaro; NITTA TOM; KIUCHI HITOSHI; NOGUCHI TAKASHI; MATSUO HIROSHI; OKADA NORIO, National Astronomical Observatory of Japan
  Grant amount(Total)：44200000, Direct funding：34000000, Indirect funding：10200000
  In this research, we have developed a superconducting MKID (microwave kinetic inductance detector) camera for wide field-of-view millimeter/submillimeter-wave astronomical observations. MKIDs composed of superconducting LC resonators sense the change in superconductive impedance when Cooper pairs are broken into quasi-particles by millimeter waves. A double slot antenna for receiving submillimeter waves and silicon substrate lens-array are combined to increase light collection efficiency. We have also developed a new FFT based MKID readout system and a compact cryogenic system consisted of large diameter silicon lenses (4K objective lens) and 1K eyepiece). The MKID camera covers 2000 pixels with 4 modules of 600 pixels. To confirm the feasibility as an observation system, a demonstration of the camera was carried out at Nobeyama 45 m telescope.
  Grant number：25247022
• Spatial resolving gamma-ray detector arrays relying on superconducting microresonators for food screening system　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A), Grant-in-Aid for Young Scientists (A), 01 Apr. 2013 - 31 Mar. 2017
  NARUSE Masato; MYOREN Hiroaki; TAINO Tohru; MIYAMOTO Noriaki; KUBOTA Ritsuki, Saitama University
  Grant amount(Total)：24050000, Direct funding：18500000, Indirect funding：5550000
  We have been developing gamma-ray detectors relying on superconducting resonators. Since these detectors can be largely multiplexed and show potential for quick response time, high spatial resolution, and high energy resolution, the proposed detectors could be suitable for use as food-screening systems.
  The superconducting resonators were fabricated with a niobium on a silicon wafer. We demonstrated 96 pixel arrays on a 20mm by 12 mm chip. The detectors were coupled to a 2-mm-thick lead absorber. We operated them in a 0.3 K cryostat and examined their characteristics against gamma-rays radiated from a cesium 137 source. We found that the detectors’ response time was around 3.6 micro second and the detector had the energy resolution of 3.8 keV at 662 keV.
  Grant number：25706029
• 超伝導検出器を用いたテラヘルツ分光カメラの開発　　　　　　　　　　　　　　　
  31 Aug. 2012 - 31 Mar. 2014
  Grant amount(Total)：2990000, Direct funding：2300000, Indirect funding：690000
  Grant number：24860015
• Development of high-sensitivity array devices for exploring the early universe　　　　　　　　　　　　　　　
  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), 23 Jul. 2009 - 31 Mar. 2014
  OTANI Chiko; SEKIMOTO Yutaro; ISHINO Hirokazu; TAJIMA Osamu; OKAMURA Takahiro; HIGUCHI Takeo; TOMARU Takayuki; MIMA Satoru; ARIYOSHI Seiichiro; DAYAMANTHI Thushara; NOGUCHI Takashi; NOGUCHI Takashi; KARATSU Kenichi; YOSHIDA Mitsuhiro; HATTORI Kaori; KIBE Yoshiro; FURUKAWA Noboru; NARUSE Masato, The Institute of Physical and Chemical Research
  Grant amount(Total)：539500000, Direct funding：415000000, Indirect funding：124500000
  In the development of ~1,000-ch detectors for CMB and CIRB observations, we had started from the development of STJ detectors. However, the better performance had been obtained by the MKIDs detectors, and then we have shifted our the development to the MKIDs detectors for the better sensitivity and the larger array format. Up to now, we have achieved the 600-pixel detector array with the 95% fabrication yield, 720-pixel Si lens array, AR coating, and 4,000 ch readout system. In addition, we have also achieved the electrical noise equivalent power (NEP) of 6e-18 W/sqrt{Hz} as well as the optical noise equivalent temperature of 190 uK sqrt{sec} which is the world record for the polarization experiment. Moreover, we have fabricated the 512-pixel device for CIRB observations, and we have developed the readout system with the commercial FPGA board and the prototype system for the GroundBIRD experiment.
  Grant number：21111003
• 平面アンテナを用いたテラヘルツ帯超伝導1000素子カメラの開発　　　　　　　　　　　　　　　
  2010 - 2011
  Grant amount(Total)：1400000, Direct funding：1400000
  Grant number：10J07757

• 複素ギャップモデルを適用した超伝導薄膜の表面抵抗の計算手法　　　　　　　　　　　　　　　
  Patent right
  Patent/Registration no：特許5540346