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INADA Yuki
| Mathematics, Electronics and Informatics Division | Associate Professor |
| Department of Electrical Engineering,Electronics, and Applied Physics |
Performance information
■ Paper- Single-shot ultrafast imaging of plasma dynamics induced by dual-angle ultrashort laser pulses with subpicosecond delay
Keitaro Shimada; Takao Saiki; Yuki Inada; Keiichi Nakagawa
Japanese Journal of Applied Physics, Volume：63, Number：11, First page：110901, Last page：110901, Nov. 2024, [Reviewed]
Abstract
Spatiotemporal manipulation of ultrashort laser pulses is crucial for enhancing laser processing and phonon generation. Optimization of these applications requires ultrafast visualization of the underlying processes. In this study, we induced laser ablation using spatiotemporally manipulated double pulses focused from two angles onto a glass surface with a 0.7 ps interval, and captured the images of its dynamics with 5 sequential frames at a frame interval of 0.8 ps. The observed dynamics suggest that the laser profile reflected on the glass surface is influenced by its topography, which in turn affects the behavior of air breakdown plasmas.
IOP Publishing, Scientific journal
DOI：https://doi.org/10.35848/1347-4065/ad8999
DOI ID：10.35848/1347-4065/ad8999, ISSN：0021-4922, eISSN：1347-4065 - Fault and Load Current Interruption in Low-Voltage System Using Fuse-Semiconductor Current-Limiting Circuit Breaker
Yuki Inada; Shungo Zen; Wataru Ohnishi; Naoto Kodama; Yusuke Nakano; Yasuhiro Takada; Reon Sasaki; Yuta Miyaoka; Kosuke Tsukamoto; Keiya Yamada; Yasushi Yamano
IEEJ Transactions on Industry Applications, Volume：144, Number：6, First page：502, Last page：508, Jun. 2024, [Reviewed], [Lead]
Institute of Electrical Engineers of Japan (IEE Japan), Scientific journal
DOI：https://doi.org/10.1541/ieejias.144.502
DOI ID：10.1541/ieejias.144.502, ISSN：0913-6339, eISSN：1348-8163
- レーザーによる大気圧空気中ストリーマ放電の電子密度・電界計測
稲田 優貴
Mar. 2025, [Invited]
Invited oral presentation - 球雷放電によるインジゴカルミン分解処理特性
加世田 倭杜; 前山 光明; 稲田 優貴
Mar. 2025
Oral presentation - 平板電極を用いたMCS放電の開発とその放電特性
浜坂 大輔; 前山 光明; 稲田 優貴
Mar. 2025
Oral presentation - 感度と速度を極めた中赤外画像診断による革新的プラズマの創出
稲田 優貴
Mar. 2025, [Invited]
Invited oral presentation - 超臨界 CO2中パルスアーク放電の電流波形の FFT 解析
田中 泰生; 藤田 真一; 手島 大智; 古里 友宏; 稲田 優貴
Mar. 2025
Oral presentation - Single-shot ultrafast multi-view imaging based on temporal wavelength division for capturing volumetric dynamics in femtosecond to nanosecond timescales
Keitaro Shimada; Yuki Inada; Keiichi Nakagawa
SPIE Photonics West 2025, Jan. 2025
Jan. 2025 - Jan. 2025, Oral presentation - 直流遮断時にヒューズ内で発生するフルグライト空洞と遮断限界の相関
大山 響紀; 山納 康; 稲田 優貴; 松本 章史; 松本 剛明
Jan. 2025
Oral presentation - 超臨界CO₂中の過渡的アーク放電の消失過程及び電圧電流波形の解析
手島 大智; 藤田 真一; 田中 泰生; 稲田 優貴; 古里 友宏
Jan. 2025
Oral presentation - プラズマ内における活性種生成機構の解明に向けた電子密度・電界計測
稲田 優貴
Jan. 2025
Nominated symposium - 超高速ダイナミクス診断技術に基づくプラズマ現象の理解
稲田 優貴
Dec. 2024
Keynote oral presentation - Active Control of Pyro-Fuse in Circuit Breaker with State Estimation of Current-Limiting Fuse
TAICHI NAKANO; Reon Sasaki; Wataru Ohnishi; Yasushi Yamano; Yuki Inada
IECON2024
Nov. 2024 - Nov. 2024, English, Oral presentation - Optimized sequence control of a fuse-semiconductor hybrid circuit breaker through real-time fuse state estimation
SONGAH SHIN; Reon Sasaki; Yusuke Nakano; Shungo Zen; Naoto Kodama; Yasushi Yamano; Yuki Inada; Wataru Ohnishi
IECON2024
Nov. 2024 - Nov. 2024, English, Oral presentation - Electron density and electric field measurement of space-time-controlled single-filament streamer discharge in atmospheric-pressure air
Yuki Inada
GEC2024 The 77th Annual Gaseous Electronics Conference, Oct. 2024, [Invited]
Sep. 2024 - Oct. 2024, English, Invited oral presentation - Computational Study of Turbulence Generation Around Arc Plasma Sustained in a Converging-Diverging Cylinder
Masaya Shigeta; Yuki Inada; Yasunori Tanaka
GEC2024 The 77th Annual Gaseous Electronics Conference
Sep. 2024 - Oct. 2024, English, Oral presentation - E-FISH法を用いた空気ストリーマ放電の電界計測
稲田 優貴
Sep. 2024, [Invited]
Invited oral presentation - 高速ICCDカメラによる超臨界CO2アーク放電プラズマの観測
手島 大智; 藤田 真一; 稲田 優貴; 古里 友宏
Sep. 2024
Oral presentation - 数値シミュレーションによる収縮拡大ノズル内SF6系流れ場のアークプラズマ誘発対流熱輸送の研究
茂田 正哉; 稲田 優貴; 田中 康規
Sep. 2024
Oral presentation - スペックルによる真空アーク消弧前後の電極表⾯粗さ測定
及川 拓真; 稲田 優貴; 前山 光明
Sep. 2024
Oral presentation - MHCD ⽤絶縁体の違いによる MCS 放電特性の⽐較,” 第48回静電気学会全国大会
小島 舞斗; 稲田 優貴; 前山 光明
Sep. 2024
Oral presentation - 真空アークカソードスポットの紫外域発光分光
國森 敬斗; 稲田 優貴; 前山 光明; 大坊 昂; 浅利 直紀; 佐々木 遥; 丹羽 芳充
Sep. 2024
Oral presentation - 平板電極を用いた２次元的並列なMCS放電に関する研究
浜坂 大輔; 前山 光明; 稲田 優貴
Sep. 2024
Oral presentation - モーションコントロール技術の異分野融合と新領域への展開ー電力・鉄道分野への展開
佐々木 怜音; 大西 亘; 兒玉 直人; 中野 裕介; 全 俊豪; 山納 康; 稲田 優貴
Aug. 2024
Oral presentation - Experimental Validation of Optimized Sequence Control for Fuse Current Under Diverse Conditions
SHIN SONGAH; 佐々木 怜音; 大西 亘; 稲田 優貴; 山納 康; 中野 裕介; 兒玉 直人; 全 俊豪
Aug. 2024
Oral presentation - 限流ヒューズを活用した直流遮断器の開発
山田 圭矢; 小林 泰平; 山田 雄大; 山納 康; 稲田 優貴
Aug. 2024
Oral presentation - 限流ヒューズ内で生じる直流アークの遮断に対するポリイミド樹脂と純水の試適用
兒玉 直人; 野々山 颯太; 横水 康伸; 小林 泰平; 山田 圭矢; 山田 雄大; 前山 光明; 山納 康; 稲田 優貴
Aug. 2024
Oral presentation - 純水を消弧材とした限流ヒューズの遮断試験
小林 泰平; 兒玉 直人; 山田 圭矢; 山田 雄大; 野々山 颯太; 前山 光明; 山納 康; 稲田 優貴
Aug. 2024
Oral presentation - Single-shot THz-bursts-in-GHz-burst (BiBurst) imaging of picosecond dynamics in each GHz burst laser ablation
Keitaro Shimada; Denisa Todorache; Rikako Tanaka; Takao Saiki; Yuki Inada; Keiichi Nakagawa
The 23rd International Conference On Ultrafast Phenomena
Jul. 2024, English, Oral presentation - プラズマの電子電解加速から活性種生成・反応に至る一連のプロセス解明
稲田 優貴
Jun. 2024
Public discourse - Numerical and experimental study of spectrum shuttle for generating GHz burst pulses without sacrificing spectral ranges in advanced ultrafast imaging
K. Shimada; A. Ishijima; T. Saiki; I. Sakuma; Y. Inada; K. Nakagawa
the 26th Photonics North Conference
May 2024, English, Oral presentation - Laser diagnostics of single-filament streamer discharge for numerical simulation validation
R. Ono; K. Tomita; Y. Inada; A. Komuro
FLTPD XV Frontiers in Low Temperature Plasma Diagnostics, [Invited]
Apr. 2024, English, Invited oral presentation - 高速イメージングで構築したビッグデータの活用法探索
稲田 優貴
Apr. 2024, [Invited]
Invited oral presentation
■ Research projects
- International collaborative research on highly sensitive fiber optic sensor for early detection of dielectric breakdown signs in power line
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Fund for the Promotion of Joint International Research (Fostering Joint International Research (B)), 07 Oct. 2021 - 31 Mar. 2024
Tokyo University of Agriculture and Technology
Grant amount(Total)：17680000, Direct funding：13600000, Indirect funding：4080000
Grant number：21KK0067 - 卓越したプラズマ可視化技術に基づく放電活性種の生成機構解明
01 Apr. 2021 - 31 Mar. 2024
Grant amount(Total)：17810000, Direct funding：13700000, Indirect funding：4110000
Grant number：21H01304 - Elucidation of Vacuum Arc Phenomena for Realization of Ultra-High Voltage DC Vacuum Circuit Breakers
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2018 - 31 Mar. 2021
Kumada Akiko, The University of Tokyo
Grant amount(Total)：17550000, Direct funding：13500000, Indirect funding：4050000
We developed the system to measure the temperature distribution and particle (electron, metal vapor, and ion) density distribution of vacuum arc plasma with high temporal and spatial resolution, and measured these arc phenomena under the conditions of varying the composition ratio and microstructure of the alloy used for the electrode and the superimposed current waveform injected from an external circuit at the time of arc interruption. Arc phenomena were measured under different conditions. Although the accuracy of the electrode temperature measurement remained to be improved, we succeeded in visualizing the state of metal vapor supply at the current zero point and developed a model that qualitatively explains the vapor supply and diffusion in the arc interruption process.
Grant number：18H01419 - Electron density visualization technique for elucidation of production mechanism of reactive species
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), 01 Apr. 2018 - 31 Mar. 2021
Inada Yuki, Saitama University
Grant amount(Total)：17940000, Direct funding：13800000, Indirect funding：4140000
The reactive species generated in atmospheric-pressure nonthermal plasma, e.g. a streamer discharge, has been expected to be utilized in wide range application fields, such as environmental pollution control, plasma-assisted ignition and combustion, plasma medicine, and plasma agriculture. However, the production mechanism of the reactive species is not fully understood. This difficulty is partially caused by the fact that the electron density determination using conventional measurement systems has been extremely difficult due to spatial non-reproducibility of the atmospheric-pressure nonthermal plasma and the low electron density in the plasma. Here, we developed a highly sensitive, single-shot electron density sensor capable of visualizing a two-dimensional electron density distribution over the streamer discharge in an unmeasurable phase.
Grant number：18H01418 - Suppression Method of Disruptive Vacuum Breakdown for Next-Generation DC Transmission and Distribution Power Network
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Research (Exploratory), 29 Jun. 2018 - 31 Mar. 2020
Inada Yuki, Saitama University
Grant amount(Total)：6240000, Direct funding：4800000, Indirect funding：1440000
We developed a shadowgraph imaging system with a ～100-ns time resolution and ～1-μs framing rate, which enabled the world first capturing of a vacuum breakdown phenomenon induced by a microparticle. In our series of observations, the vacuum breakdown was found to be caused by two types of microparticles: those with diameters of ～100μm and ～10μm. Further, all the particle-induced vacuum breakdowns occurred at the time of particle collision with the negative electrode. In addition, the decrease in the particle size was not observed during the particle flight between the electrodes or at the particle collision with the negative electrode.
Grant number：18K18845 - Development of an atmospheric pressure plasma source capable of generating massive amounts of chemically active species and evaluation of decomposition performance for refractory solutions
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 01 Apr. 2015 - 31 Mar. 2018
MAEYAMA Mitsuaki; SUZUKI Hitoshi; TAKATORI Yoshimitsu; TOKAJI Kimio; IKEDA Kazumi; SUZUKI Fumiya; IMAMURA Kengo; MORI Yuuya; MIYAMOTO Rei; KANAMORI Yasotoshi, Saitama University
Grant amount(Total)：4420000, Direct funding：3400000, Indirect funding：1020000
By the ball-lightning discharge, first announced in 2002, decomposition performances and its abilities generating chemical active species, such as ozon and OH radicals, depending on the discharge polarities were studied experimentally.
As a result, its performance was evaluated by decomposition of indigo carmine dye and acetic acid,which are widely used for evaluation of water treatment. And it can be estimated about 1/2 of the maximum efficiency obtained by other water treatment, as initial results. We also found a difference between the decomposition characteristics due to the polarity of discharge and its active species. Furthermore, the decomposition process was examined by two-dimensional measurement of luminescence from active species and liquid chromatography analysis.
Grant number：15K05932 - Highly sensitive and temporally resolved electron density measurement of discharge plasma for effective and selective generation of reactive species
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (A), 01 Apr. 2015 - 31 Mar. 2018
INADA Yuki, Saitama University
Grant amount(Total)：23400000, Direct funding：18000000, Indirect funding：5400000
The streamer discharge in open air is one of the important types of atmospheric-pressure non-thermal plasma, and it has been attracting interest in a wide range application fields: environmental pollution control, plasma-assisted ignition and combustion, and plasma medicine. However, the processes by which reactive species are produced in air streamers are not fully understood because the electron density determination using conventional measurement
systems has been extremely difficult.
In order to overcome the difficulty, we developed novel electron density sensors capable of visualizing two-dimensional electron density distributions from single-shot recordings under sensitivity of 10^20m^-3 and temporal resolution of 1ns. These sensors were successfully used for the electron density imaging over the air streamer discharges and production mechanisms of several reactive species were elucidated.
Grant number：15H05515 - Evolutionary study toward practical use of high-performance environmentally-friendly gas insulation system using CF3I gas
Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 01 Apr. 2013 - 31 Mar. 2016
Hidaka Kunihiko, The University of Tokyo
Grant amount(Total)：46800000, Direct funding：36000000, Indirect funding：10800000
CF3I gas is one of the alternatives for SF6. Its insulation performance is superior to SF6 in uniform field and its Global Warming Potential (GWP) is quite low as same as CO2. The electrical properties of CF3I and CF3I/N2, CF3I/CO2 and CF3I/SF6 mixtures are closely examined and the results show that CF3I can be used as SF6-substitute gas in Gas Insulated transmission-Line (GIL). A simple ranking method is proposed where the dielectric properties, saturated gas pressure, and GWP are taken into account in selecting the mixture ratio as pragmatic gas mixture to GIL. With this method, it turns out that CF3I(20%)/CO2(80%) or CF3I(20%)/N2(80%) gas mixtures are the reasonable choices. In addition, the applicability of these CF3I gas mixtures to the existing 275kV-GIL is evaluated through computation of cross sectional size of conductors based not only on insulation designing but also on thermal designing.
Grant number：25249028