Doctor of Engineering, Kyoto University

Fundamental plasma, Plasma science

1983 - 1994, Kyoto University

1983 - 1989, Kyoto University

Neutral-density dependence of EIR- and MAR-dominated detachment regimes in hydrogen plasmas with multi-ion-temperature effects
Hiroki Natsume; Hirohiko Tanaka; Satoshi Togo; Keiji Sawada; Kazuo Hoshino; Noriyasu Ohno
PHYSICS OF PLASMAS, 33(7), Jul. 2026

Dynamic response of detached plasma to intermittent heat and particle fluxes induced by double-pulse ECH in GAMMA 10/PDX
Masayuki Yoshikawa; Junko Kohagura; Naomichi Ezumi; Tsuyoshi Kariya; Ryutaro Minami; Tomoharu Numakura; Mafumi Hirata; Satoshi Togo; Yoriko Shima; Takuma Okamoto; Satoshi Takahashi; Yousuke Nakashima; Takashi Minami; Kazuma Emoto; Shinji Kobayashi; Daisuke Kuwahara; Heniee van der Meiden; Keiji Sawada; Mizuki Sakamoto
NUCLEAR FUSION, 66(5), May 2026

Control of detached plasma through neutral particle residence time and its impact on metastable atom production
Yuki Hayashi; Noriyasu Ohno; Hiroki Natsume; Hirohiko Tanaka; Shin Kajita; Mitsutoshi Aramaki; Ryoji Mano; Ryosuke Koyama; Keiji Sawada
PHYSICS OF PLASMAS, 33(1), Jan. 2026

Deep Learning of Hydrogen Trapping Sites in Tungsten for Atomistic Plasma-Wall Simulations
Seiki Saito; Keisuke Takeuchi; Hiroaki Nakamura; Yasuhiro Oda; Keiji Sawada; Kazuo Hoshino; Yuki Homma; Shohei Yamoto; Yuki Uchida
PLASMA AND FUSION RESEARCH, 21, 2026

Machine learning-based hydrogen recycling model for predicting rovibrational distributions of released molecular hydrogen on tungsten materials via molecular dynamics simulations
Seiki Saito; Masato Iida; Hiroaki Nakamura; Keiji Sawada; Kazuo Hoshino; Masahiro Kobayashi; Masahiro Hasuo; Yuki Homma; Shohei Yamoto
NUCLEAR MATERIALS AND ENERGY, 43, Jun. 2025

Emission of high rovibrational hydrogen molecules under detached plasma conditions by recycling on the tungsten wall
Seiki Saito; Hiroaki Nakamura; Keiji Sawada; Kazuo Hoshino; Yuki Kojima; Takeshi Doi; Masahiro Kobayashi; Masahiro Hasuo; Yuki Homma; Shohei Yamoto
NUCLEAR FUSION, 64(12), Dec. 2024

Experimental validation of a collision-radiation dataset for molecular hydrogen in plasmas
Keisuke Fujii; Keiji Sawada; Arseniy Kuzmin; Motoshi Goto; Masahiro Kobayashi; Liam H. Scarlett; Dmitry V. Fursa; Igor Bray; Mark C. Zammit; Theodore M. Biewer
PHYSICS OF PLASMAS, 31(9), Sep. 2024

First results of multi-fluid modeling of detached hydrogen plasmas in a linear plasma device using fluid code LINDA-NU
Kento Sugiura, Taichi Ido, Hirohiko Tanaka, Hiroki Natsume, Shota Masuda, Kazuo Hoshino, Keiji Sawada, Noriyasu Ohno
Contrib. Plasma Phys., 64, e202300150, 2024, Refereed

Deep learning model for predicting the spatial distribution of binding energy from atomic configurations
Seiki Saito, Shingo Sato, Hiroaki Nakamura, Chako Takahashi, Keiji Sawada, Kazuo Hoshino, Masahiro Kobayashi and Masahiro Hasuo
Jpn. J. Appl. Phys., 63, 09SP03, 2024, Refereed

Hydrogen isotope effects on recombination dominant plasmas in NAGDIS-II
Jielin Shi, Hideki Kaizawa, Yuta Uematsu, Hirohiko Tanaka, Shin Kajita, Noriyasu Ohno, Keiji Sawada and Hongbin Ding
Plasma Phys. Control. Fusion, 66, 085006, 2024, Refereed

Corrigendum to “Ro-vibrational population distribution in the ground state of hydrogen isotopologues in LHD peripheral plasmas deduced from emission spectroscopy” [J. Quant. Spectrosc. Radiat. Transfer 267 (2021) 107592] (Journal of Quantitative Spectroscopy and Radiative Transfer (2021) 267, (S0022407321000856), (10.1016/j.jqsrt.2021.107592))
Hiroki Ishihara; Arseniy Kuzmin; Masahiro Kobayashi; Taiichi Shikama; Keiji Sawada; Seiki Saito; Hiroaki Nakamura; Keisuke Fujii; Masahiro Hasuo
Journal of Quantitative Spectroscopy and Radiative Transfer, 291, Nov. 2022

Isotope Effect for Plasma Detachment in Helium and Hydrogen/Deuterium Mixture Plasmas
Xinyue GUO, Hirohiko TANAKA, Shin KAJITA, Noriyasu OHNO, Shogo HATTORI, Keiji SAWADA
Plasma and Fusion Research, 17,, 2402027, 2022, Refereed

Reduction of pulsed particle load with dynamic pressure induced by transient recycled neutral flux
Yuki Hayashi, Hirohiko Tanaka, Noriyasu Ohno, Shin Kajita, Thomas Morgan, Hennie van der Meiden, John Scholten, Jordy Vernimmen, Hiroki Natsume, Keiji Sawada, Shota Masuda
Plasma Physics and Controlled Fusion, 64, 105013, 2022, Refereed

Electron and Proton Energy Loss via Rovibrational Excitation of Molecular Hydrogen in Fusion Detached Plasmas
Keiji SAWADA
Plasma and Fusion Research, 17, 2403044-1-4, 2022, Refereed

Neutral Particle Transport Studies over the Plasma to the Wall Realized by Integration of Element Models
齋藤誠紀; 中村浩章; 中村浩章; 澤田圭司; 河村学思; 河村学思; 小林政弘; 小林政弘
プラズマ・核融合学会誌, 98(1), 5-19, 2022

Isotope effect of rovibrational distribution of hydrogen molecules desorbed from amorphous carbon
Nakamura, Hiroaki; Saito, Seiki; Sawada, Takumi; Sawada, Keiji; Kawamura, Gakushi; Kobayashi, Masahiro; Hasuo, Masahiro
JAPANESE JOURNAL OF APPLIED PHYSICS, 61(SA), SA1005-SA1005, 2022, Refereed

Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX
Hiroki Gamo; Naomichi Ezumi; Tsukasa Sugiyama; Kunpei Nojiri; Ayane Kondo; Mafumi Hirata; Junko Kohagura; Masayuki Yoshikawa; Yousuke Nakashima; Dogyun Hwangbo; Mizuki Sakamoto; Renato Perillo; Tatsuya Kuwabara; Hirohiko Tanaka; Noriyasu Ohno; Keiji Sawada; Akira Tonegawa; Suguru Masuzaki
PLASMA AND FUSION RESEARCH, 16, 2021

Atomic and Molecular Processes in Ion Source Plasmas
柴田 崇統; 澤田 圭司
プラズマ・核融合学会誌 = Journal of plasma and fusion research, 97(10), 572-576, 2021

Ro-vibrational population distribution in the ground state of hydrogen isotopologues in LHD peripheral plasmas deduced from emission spectroscopy
Hiroki Ishihara, Arseniy Kuzmin, Masahiro Kobayashi, Taiichi Shikama, Keiji Sawada, Seiki Saito, Hiroaki Nakamura, Keisuke Fujii, Masahiro Hasuo, the LHD Experiment Group.
Journal of Quantitative Spectroscopy & Radiative Transfer, 267, 107592, 2021

Detached helium plasma simulation by a one-dimensional fluid code with detailed collisional-radiative model
Tanaka, H.; Saeki, I.; Ohno, N.; Kajita, S.; Ido, T.; Natsume, H.; Hatayama, A.; Hoshino, K.; Sawada, K.; Goto, M.
PHYSICS OF PLASMAS, 27(10), 102505, 2020, Refereed

Development of a Molecular Dynamics Method with Heat Transfer into Bulk for Ion Injection into Materials
Saito, Seiki; Nakamura, Hiroaki; Sawada, Keiji; Kobayashi, Masahiro; Gakushi, Kawamura; Masahiro, Hasuo
PLASMA AND FUSION RESEARCH, 15, 2403073, 2020, Refereed

Molecular dynamics simulation for hydrogen recycling on tungsten divertor for neutral transport analysis
Saito, Seiki; Nakamura, Hiroaki; Sawada, Keiji; Kobayashi, Masahiro; Kawamura, Gakushi; Sawada, Takumi; Masahiro, Hasuo
JAPANESE JOURNAL OF APPLIED PHYSICS, 60(60), SAAB08, 2020

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST
Mori, Satoru; Shikama, Taiichi; Hanada, Kazuaki; Yoneda, Nao; Kuzmin, Arseniy; Hasuo, Masahiro; Idei, Hiroshi; Onchi, Takumi; Ejiri, Akira; Osawa, Yuki; Peng, Yi; Matsuzaki, Kyohei; Kado, Shinichiro; Sawada, Keiji; Ido, Takeshi; Nakamura, Kazuo; Ikezoe, Ryuya; Nagashima, Yoshihiko; Hasegawa, Makoto; Kuroda, Kengo; Higashijima, Aki; Nagata, Takahiro; Shimabukuro, Shun
ATOMS, 8(3), 44, 2020

Neutral transport code for rovibrational population calculation of molecular hydrogen in large helical device plasmas
K. Sawada, H. Nakamura, S. Saito, G. Kawamura, M. Kobayashi, K. Haga, R. Migita, T. Sawada, M. Hasuo
Contrib. Plasm. Phys., 60(5-6), e201900153, 2020

Molecular Dynamics Simulation Model of Hydrogen Recycling on Carbon Divertor for Neutral Transport Analysis in LHD
S. Saito, H. Nakamura, K. Sawada, G. Kawamura, M. Kobayashi, M. Hasuo
Contrib. Plasm. Phys., 60(5-6), e201900152, 2020

Reaction processes of molecular activated recombination leading to detachment of divertor simulation plasma in GAMMA 10/PDX
A. Terakado, M. Sakamoto, N. Ezumi, K. Nojiri, T. Mikami, Y. Kinoshita, S. Togo, T. Iijima, K. Sawada, S. Kado, Y. Nakashima
Nuclear Materials and Energy, 20, 100679, 2019, Refereed

Impact of additional plasma heating on detached plasma formation in divertor simulation experiments using the GAMMA 10/PDX tandem mirror
Y. Nakashima; M.S. Islam; T. Iijima; M. Sakamoto; N. Ezumi; M. Yoshikawa; N. Asakura; M. Fukumoto; A. Hatayama; M. Hirata; M. Ichimura; R. Ikezoe; T. Imai; M.M. Islam; T. Kariya; J. Kohagura; S. Masuzaki; R. Minami; T. Nakano; K. Nojiri; T. Numakura; K. Sawada; M. Shoji; A. Terakado; S. Togo; S. Yamashita; T. Yoshimoto
Nuclear Materials and Energy, 18, 216-221, 2019

Hydrogen recycling study with a high temperature target in the divertor simulation experiment in GAMMA 10 / PDX
Akihiro TERAKADO, Mizuki SAKAMOTO, Naomichi EZUMI, Kunpei NOJIRI, Tomohiro MIKAMI, Satoshi TOGO, Takaaki IIJIMA, Takayuki YOKODO, Keiji SAWADA
Plasma and Fusion Research, 13, 3402096, 2018, Refereed

Recent progress of divertor simulation research using the GAMMA 10/PDX tandem mirror
Y. Nakashima; K. Ichimura; M. S. Islam; M. Sakamoto; N. Ezumi; M. Hirata; M. Ichimura; R. Ikezoe; T. Imai; T. Kariya; I. Katanuma; J. Kohagura; R. Minami; T. Numakura; M. Yoshikawa; T. Iijima; M. M. Islam; K. Nojiri; K. Shimizu; A. Terakado; S. Togo; N. Asakura; M. Fukumoto; A. Hatayama; Y. Hirooka; S. Kado; H. Kubo; S. Masuzaki; H. Matsuura; T. Nakano; S. Nagata; N. Nishino; N. Ohno; A. Sagara; K. Sawada; M. Shoji; A. Tonegawa; Y. Ueda
NUCLEAR FUSION, 57(11), 116033, Nov. 2017, Refereed

Molecular activated recombination in divertor simulation plasma on GAMMA 10/PDX
M. Sakamoto; A. Terakado; K. Nojiri; N. Ezumi; Y. Nakashima; K. Sawada; K. Ichimura; M. Fukumoto; K. Oki; K. Shimizu; N. Ohno; S. Masuzaki; S. Togo; J. Kohagura; M. Yoshikawa
Nuclear Materials and Energy, 12, 1004-1009, 2017

Photon Trapping Effects in DEMO Divertor Plasma
K. Hoshino; K. Sawada; R. Idei; S. Tokunaga; N. Asakura; K. Shimizu; N. Ohno
CONTRIBUTIONS TO PLASMA PHYSICS, 56(6-8), 657-662, Aug. 2016

Particle source and edge confinement study based on spectroscopic diagnosis in the LHD
M. Goto; K. Sawada; T. Oishi; S. Morita
PLASMA PHYSICS AND CONTROLLED FUSION, 58(8), 84001-84005-84005, Aug. 2016

Spatial Distribution Measurement of Molecular Activated Recombination Using Hydrogen Balmer Line Intensities of Divertor Simulation Plasma in GAMMA 10/PDX
A. Terakado; M. Sakamoto; N. Ezumi; S. Togo; K. Nojiri; Y. Nakashima; K. Ichimura; K. Sawada; J. Kohagura
OPEN MAGNETIC SYSTEMS FOR PLASMA CONFINEMENT (OS2016), 1771, 2016, Refereed

Rovibrationally Resolved Time-Dependent Collisional-Radiative Model of Molecular Hydrogen and Its Application to a Fusion Detached Plasma
Keiji Sawada and Motoshi Goto
Atoms, 4(4), 29, 2016, Refereed

ENERGY DENSITY DEPENDENCE OF HYDROGEN COMBUSTION EFFICIENCY IN ATMOSPHERIC PRESSURE MICROWAVE PLASMA
T. Yoshida; N. Ezumi; K. Sawada; Y. Tanaka; M. Tanaka; K. Nishimura
FUSION SCIENCE AND TECHNOLOGY, 67(3), 650-653, Apr. 2015

Hydrogen atomic and molecular emission locations and intensities in the LHD edge plasma determined from simultaneously observed polarization spectra
K. Fujii, K. Sawada, M Goto, S. Morita, M. Hasuo
Plasma and Fusion Research, 10, 3402041-3402041, 2015, Refereed

Hydrogen and Hydrocarbon Combustion in Atmospheric Pressure Plasma
N.,Ezumi; K.,Sawada; Y.,Tanaka; M.,Tanaka; K.,Nishimura
Annual Report of National Institute for Fusion Science, April 2013-March 2014, 368, Nov. 2014

Divertor Heat Flux Control and Plasma-Material Interaction
KIKUCHI Yusuke; SAWADA Keiji; TAKAMURA Shuichi; UEDA Yoshio; NAGATA Masayoshi
プラズマ・核融合学会誌, 90(8), 480-488, Aug. 2014

Influence of Plasma-Neutral Collisions on Probe Measurements in Atmospheric Pressure Plasmas
N. Ezumi; K. Takahashi; T. Yoshida; Y. Hatada; Y. Hayashi; C. Uchiyama; S. Iio; K. Sawada; N. Ohno; Zh Kiss'ovski
CONTRIBUTIONS TO PLASMA PHYSICS, 54(3), 304-307, Apr. 2014

Determination of electron temperature and density at plasma edge in the Large Helical Device with opacity-incorporated helium collisional-radiative model
M. Goto; K. Sawada
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, 137, 23-28, Apr. 2014

Numerical study of the H0 atomic density and the balmer line intensity profiles in a hydrogen negative ion source with the effect of non-equilibrium electron energy distribution function
Takanori Shibata; Mieko Kashiwagi; Akiyoshi Hatayama; Keiji Sawada; Takashi Inoue; Masaya Hanada
Plasma and Fusion Research, 9, 1401011, 2014

2. Coordinated Research Projects(CRP)(Coordinated Research Projects of the IAEA(CRP))
TAKAGI Hidekazu; KOIKE Fumihiro; NAKAMURA Nobuyuki; SAKAUE Hiroyuki A.; SAWADA Keiji; GOTO Motoshi; KATO Daiji; ASHIKAWA Naoko; NISHIMURA Yoshifumi; SAITO Jun; YOKOGAWA Daisuke; CHOU Chien-Pin; WITEK Henryk A.; IRLE Stephan
プラズマ・核融合学会誌, 89(9), 583-599, Sep. 2013

Optimization of a corrugated millimeter-wave waveguide and a miter bend by FDTD simulation
H Nakamura; N Kashima; A Takayama; K Sawada; Y Tamura; S Fujiwara; S Kubo
Journal of Physics: Conference Series, 410, 012046-012046, Feb. 2013

Deuterium atomic density estimation in recombining plasmas using self-absorption spectroscopy
Shin Kajita; Toshihiro Nishiwaki; Noriyasu Ohno; Keiji Sawada; Makoto Takagi
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, 8(1), 1-6, Jan. 2013

Influence of the Probe Electrode on Probe Measurements for Atmospheric Pressure Microwave Plasma Torch
N. Ezumi; N. Kodama; K. Akahane; S. Shiozawa; K. Sawada; N. Ohno
CONTRIBUTIONS TO PLASMA PHYSICS, 53(1), 81-85, Jan. 2013

Evaluation of particle source rate and its influence on particle transport in fusion plasma
M. Goto; K. Sawada; K. Fujii; M. Hasuo; S. Morita
Journal of Physics: Conference Series, 397, Jan. 2012

Optical emission and mass spectra observations during hydrogen combustion in atmospheric pressure microwave plasma
Naomichi Ezumi; Kazuhiko Akahane; Keiji Sawada; Yasunori Tanaka; Masahiro Tanaka; Tatsuhiko Uda; Kiyohiko Nishimura
Plasma and Fusion Research, 7(1), 2401075, 2012

A collisional-radiative model for hydrogen atom including velocity changing collisions
Keisuke Fujii; Taiichi Shikama; Keiji Sawada; Keiji Sawada; Motoshi Goto; Shigeru Morita; Masahiro Hasuo
Plasma and Fusion Research, 6, 2401125-2401125, Dec. 2011

Evaluation of hydrogen atom density in the plasma core region based on the Balmer-alpha line profile
M. Goto; K. Sawada; K. Fujii; M. Hasuo; S. Morita
NUCLEAR FUSION, 51(2), 23005, Feb. 2011

Spectroscopic diagnostic of helium-hydrogen RF plasma under the influence of radiation trapping
Keiji Sawada; Motoshi Goto; Naomichi Ezumi
Plasma and Fusion Research, 6(2011), 1401010-1-9, 2011

輻射再吸収とプラズマ分光診断
門信一郎; 後藤基志; 澤田圭司; 岩前敦; 蓮尾昌裕
プラズマ・核融合学会誌, 86(11), 631-647, Nov. 2010

Atomic and molecular processes with lithium in peripheral plasmas
I. Murakami; D. Kato; Y. Hirooka; K. Sawada
FUSION ENGINEERING AND DESIGN, 85(6), 854-857, Nov. 2010

Development of multiwavelength-range fine-resolution spectrometer for hydrogen emissions and its application to large helical device periphery plasmas
K. Fujii; K. Mizushiri; T. Nishioka; T. Shikama; A. Iwamae; M. Goto; S. Morita; S. Kado; K. Sawada; M. Hasuo
REVIEW OF SCIENTIFIC INSTRUMENTS, 81(3), 033106-1-4, Mar. 2010

Collisional-radiative model for spectroscopic diagnostic of optically thick helium plasma
K. Sawada; Y. Yamada; T. Miyachika; N.Ezumi; A. Iwamae; M. Goto
Plasma and Fusion Res., 5, 01-1-7-1, 2010

FDTD simulation on plasmon in gold nanorod excited by scanning near field optical microscopy
K. Sawada; H. Nakamura; T. Maruoka; Y. Tamura; K. Imura; T. Saiki; H. Okamoto
Plasma and Fusion Res., 5, S2110-1-4-S2110, 2010

Magnetic axial dependency of Hα emission location in peripheral plasmas of Large Helical Device as determined by plasma polarization spectroscopy
A. Iwamae; A. Sakaue; N. Neshi; J. Yanagibayashi; M. Hasuo; D. Nakamura; K. Sawada; M. Goto; S. Morita
Plasma and Fusion Res., 5, 032-1-8-32, 2010

Alignment creation and deviation from statistical population distribution in hydrogen n=3 levels observed on MSE spectra of LHD plasma
Atsushi Iwamae; Atsushi Sakaue; Makoto Atake; Keiji Sawada; Motoshi Goto; Sigeru Morita
PLASMA PHYSICS AND CONTROLLED FUSION, 51(11), 115004-1-15, Nov. 2009

Simulation of Electric Quadrupole and Magnetic Dipole Transition Efficiencies in Optical Near Fields Generated by a Subwavelength Slit Array
Kazuhiro Deguchi; Michihiro Okuda; Atsushi Iwamae; Hiroaki Nakamura; Keiji Sawada; Masahiro Hasuo
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 78(2), 024301-1-4, Feb. 2009

Spatial structure of volume recombination in JT-60U detached divertor plasmas
K. Fujimoto; T. Nakano; H. Kubo; K. Sawada; T. Takizuka; H. Kawashima; K. Shimizu; N. Asakura
Plasma and Fusion Res., 4, 025-1-7-25, 2009

Surface temperature effects on hydrogen and impurity release from the limiter studied by means of visible and near infrared spectroscopic measurement in TRIAM-1M
R. Bhattacharyay; H. Zushi; K. Nakashima; T. Shikama; M. Sakamoto; M. Ogawa; K. Nakamura; N. Yoshida; S. Kado; K. Sawada; Y. Hirooka; K. Hanada; K. N. Sato; H. Idei; K. Sasaki; H. Xu; M. Hasegawa; K. Uehara; A. Tsushima; N. Kimura; Y. Nozaki; S. Kawasaki; H. Nakashima; A. Higashijima
JOURNAL OF NUCLEAR MATERIALS, 363, 938-943, Jun. 2007

Detailed atomic, molecular and radiation kinetics in current 2D and 3D edge plasma fluid codes
D. Reiter; V. Kotov; P. Boerner; K. Sawada; R. K. Janev; B. Kueppers
JOURNAL OF NUCLEAR MATERIALS, 363, 649-657, Jun. 2007

Contribution of hydrogen molecular assisted recombination processes to population of hydrogen atom in divertor simulator MAP-II
A. Okamoto; S. Kado; K. Sawada; Y. Kuwahara; Y. Iida; S. Tanaka
JOURNAL OF NUCLEAR MATERIALS, 363, 395-399, Jun. 2007

Modification of tomography technique for two-dimensional spectroscopic measurement in JT-60U divertor plasmas
K. Fujimoto; T. Nakano; H. Kubo; K. Sawada; T. Takizuka; K. Shimizu; H. Kawashima; N. Asakura
Plasma and Fusion Res., 2, S1121-1-4-S1121, 2007

Iterative numerical method for the inclusion of radiation trapping into a collisional-radiative model
Keiji Sawada
JOURNAL OF PLASMA PHYSICS, 72, 1025-1029, Dec. 2006

FDTD modeling of a polarization near-field scanning optical microscope
K. Sawada; M. Sakai; Y. Kohashi; T. Saiki; H. Nakamura
JOURNAL OF PLASMA PHYSICS, 72, 1019-1023, Dec. 2006

Simulation of optical near field of a sub-wavelength gold slit array and its electric quadrupole interaction with 1s excitons in Cu2O
M. Okuda; K. Deguchi; A. Iwamae; H. Nakamura; K. Sawada; M. Hasuo
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 10, 3(10), 3547-+, 2006

Spectroscopic study of hydrogen particle behavior in attached and detached divertor plasmas of JT-60U
H Kubo; H Takenaga; K Sawada; T Nakano; S Kobayashi; S Higashijima; N Asakura; K Shimizu
JOURNAL OF NUCLEAR MATERIALS, 337(1-3), 161-165, Mar. 2005

Determination of the hydrogen and helium ion densities in the initial and final stages of a plasma in the Large Helical Device by optical spectroscopy
M Goto; S Morita; K Sawada; T Fujimoto; S Yamamoto; J Miyazawa; H Yamada; K Toi
PHYSICS OF PLASMAS, 10(5), 1402-1410, May 2003

FDTD analysis of a near-field optical fiber probe with a double tapered structure
K Sawada; H Nakamura; H Kambe; T Saiki
IEICE TRANSACTIONS ON ELECTRONICS, E85C(12), 2055-2058, Dec. 2002

Relations between the ionization or recombination flux and the emission radiation for hydrogen and helium in plasma
M Goto; K Sawada; T Fujimoto
PHYSICS OF PLASMAS, 9(10), 4316-4324, Oct. 2002

Emission radiation of hydrogen and helium atoms and ions a plasma
M Goto; K Sawada; T Fujimoto
CONTRIBUTIONS TO PLASMA PHYSICS, 42(2-4), 212-217, 2002

Effect of initial vibrational excitation of molecular hydrogen on molecular assisted recombination in divertor plasmas
K Sawada; T Fujimoto
CONTRIBUTIONS TO PLASMA PHYSICS, 42(6-7), 603-607, 2002

FDTD simulation of tapered structure of near-field fiber probe
H Nakamura; T Saiki; H Kambe; K Sawada
COMPUTER PHYSICS COMMUNICATIONS, 142(1-3), 464-467, Dec. 2001, Refereed

Design and optimization of tapered structure of near-field fibre probe based on finite-difference time-domain simulation
H. Nakamura; T. Sato; H. Kambe; K. Sawada; T. Saiki
Journal of Microscopy, 202(1), 50-52, Apr. 2001

FDTD analysis of the collection efficiency and the spatial resolution of near-field metal-coated double-tapered probes
K Sawada; H Kambe; H Nakamura; T Saiki
CLEO(R)/PACIFIC RIM 2001, VOL II, TECHNICAL DIGEST, 364-365, 2001, Refereed

Spatial resolution of near-field scanning optical microscopy with sub-wavelength aperture
H Nakamura; K Sawada; H Kambe; T Saiki; T Sato
PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, (138), 173-174, 2000

Ultraviolet photoemission studies of valence bands in lead halides
M Itoh; T Shiokawa; K Sawada; M Kamada
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 67(6), 2140-2141, Jun. 1998

Phonon broadening of line widths of Auger-free luminescence in wide-gap ionic crystals
M Itoh; K Sawada; H Hara; N Ohno; M Kamada
JOURNAL OF LUMINESCENCE, 72-4, 762-764, Jun. 1997

Effective ionization and dissociation rate coefficients of molecular hydrogen in plasma (vol 78, pg 2913, 1995)
K Sawada; T Fujimoto
JOURNAL OF APPLIED PHYSICS, 80(1), 606-606, Jul. 1996

EFFECTIVE IONIZATION AND DISSOCIATION RATE COEFFICIENTS OF MOLECULAR-HYDROGEN IN PLASMA
K SAWADA; T FUJIMOTO
JOURNAL OF APPLIED PHYSICS, 78(5), 2913-2924, Sep. 1995

Development of integrated code for multi-fluid hydrogen plasma and neutral transport and analysis of EIR-MAR transition process
杉浦健斗; 夏目祥揮; 夏目祥揮; 増田翔太; 田中宏彦; 澤田圭司; 大野哲靖; 星野一生; 齋藤誠紀; 中村浩章; 梅澤英弥; 眞野綾二
プラズマ・核融合学会年会(Web), 40th, 2023

Development of a hydrogen and a helium 1D PIC code for integration with Neutral Particle Transport codes
小山晟矢; 小山諒典; NGUTEN Hong Lam; 澤田圭司; 大野哲靖; 中村浩章; 中村浩章; 齋藤誠紀; 河村学思; 河村学思
プラズマ・核融合学会年会(Web), 40th, 2023

Rovibrationally resolved neutral transport codes for molecular hydrogen and molecular deuterium
土居健志; 西分久弘; 佐藤優作; 上田朝陽; 澤田圭司; 河村学思; 河村学思; 齋藤誠紀; 中村浩章; 中村浩章; 星野一生
プラズマ・核融合学会年会(Web), 39th, 2022

Application of hydrogen recycling model based on molecular dynamics to DEMO reactor
齋藤誠紀; 中村浩章; 中村浩章; 澤田圭司; 星野一生; 小林政弘; 小林政弘; 蓮尾昌裕; 小島翔樹; 飯田聖人; 土居健志
プラズマ・核融合学会年会(Web), 39th, 2022

Integration of PIC code and neutral transport code for 1D divertor simulation
関谷光之; 小山晟矢; 澤田圭司; 大野哲靖; 中村浩章; 中村浩章; 齋藤誠紀; 河村学思; 河村学思
プラズマ・核融合学会年会(Web), 39th, 2022

Numerical Simulation and Machine Learning in Research of Plasma-Wall Interaction
齋藤誠紀; 中村浩章; 中村浩章; 澤田圭司; 高三和己
シミュレーション, 41(4), 2022

Construction of one-dimensional PIC code and neutral transport code for divertor plasmas
関谷光之; 小山晟矢; 澤田圭司; 中村浩章; 中村浩章; 齋藤誠紀; 河村学思; 河村学思
プラズマ・核融合学会年会(Web), 38th, 2021

Molecular Dynamics Simulation for Hydrogen Recycling on Plasma Facing Materials
齋藤誠紀; 中村浩章; 中村浩章; 澤田圭司; 小林政弘; 小林政弘; 河村学思; 河村学思; 蓮尾昌裕
プラズマ・核融合学会年会(Web), 38th, 2021

MD simulation of hydrogen isotope incidents on tungsten and carbon material
澤田拓弥; 中村浩章; 中村浩章; 齋藤誠紀; 澤田圭司; 河村学思; 河村学思; 小林政弘; 小林政弘; 蓮尾昌弘
日本物理学会講演概要集(CD-ROM), 75(1), 777 - 777, 2020

Rotational State Population Distribution of Hydrogen Molecules in LHD Peripheral Plasmas Measured by Fulcher-α Band Spectroscopy
蓮尾昌裕; 石原啓基; ARSENIY Kuzmin; 小林政弘; 澤田圭司; 四竈泰一; 齋藤誠紀; 中村浩章; 門信一郎
日本物理学会講演概要集(CD-ROM), 75(1), 2020

Development of PIC code and neutral particle transport code for one-dimensional simulation of divertor plasmas
右田龍星; 関谷光之; 澤田圭司; 河村学思; 河村学思; 斎藤誠紀; 中村浩章; 中村浩章
プラズマ・核融合学会年会(Web), 37th, 2020

Spectra calculation of LHD hydrogen plasmas with a neutral transport code including rovibrational levels of molecules
羽下健太; 土居健志; 澤田圭司; 河村学思; 河村学思; 小林政弘; 小林政弘; KUZMIN Arseniy A.; 蓮尾昌裕; 斎藤誠紀; 中村浩章; 中村浩章
プラズマ・核融合学会年会(Web), 37th, 2020

アモルファス炭素壁への水素入射の分子動力学シミュレーション
澤田拓弥; 中村浩章; 中村浩章; 齋藤誠紀; 澤田圭司; 土生柊
日本応用数理学会年会講演予稿集(CD-ROM), 2019, 2019

Fulcher-α帯スペクトル計測によるLHD周辺プラズマ中基底水素分子の振動・回転状態密度分布評価
石原啓基; KUZMIN Arseniy; 小林政弘; 澤田圭司; 四竈泰一; 蓮尾昌裕; 齋藤誠紀; 中村浩章; 門信一郎
プラズマ・核融合学会年会(Web), 36th, 2019

プラズマ対向壁リサイクリングモデル開発を目指した水素プラズマ照射の分子動力学シミュレーション
斎藤誠紀; 中村浩章; 中村浩章; 澤田圭司; 小林政弘; 河村学思; 蓮尾昌裕
日本応用数理学会年会講演予稿集(CD-ROM), 2018, 2018

水素分子の振動・回転状態を考慮した衝突輻射モデルおよび中性粒子輸送コードの構築
澤田圭司; 右田龍星; 羽下健太; 中村浩章; 中村浩章; 斎藤誠紀
プラズマ・核融合学会年会(Web), 35th, 2018

Calculation of Kinetic Energy Distributions of Hydrogen Atoms and Helium Atoms Incident on the LHD First Wall
澤田圭司; 坂本隆一; 後藤基志; 中村浩章; 斎藤誠紀
プラズマ・核融合学会年会(Web), 32nd, 2015

25pYG-3 分光計測に基づく粒子ソース項の評価と粒子輸送に与えるその影響(25pYG 核融合プラズマ(輸送・閉じ込め特性(1)・分光・計測),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理)
後藤 基志; 澤田 圭司; 藤井 恵介; 蓮尾 昌裕; 森田 繁
日本物理学会講演概要集, 67(1), 05 Mar. 2012

25aYG-1 FDTD simulation of millimeter-wave propagation in corrugated waveguide
Okamura T.; Nakamura H.; Tamura Y.; Sawada K.; Kubo S.
Meeting Abstracts of the Physical Society of Japan, 67(0), 263 - 263, 2012

18aFJ-7 Three-dimensional simulation of electromagnetic wave propagation in the corrugated waveguide by FDTD
Okamura T.; Nakamura H.; Tamura Y.; Sawada K.; Kubo S.; Takayama A.; Kashima N.
Meeting Abstracts of the Physical Society of Japan, 67(0), 189 - 189, 2012

28aGZ-6 バルマーα線プロファイルに基づく粒子輸送の研究(28aGZ 核融合プラズマ(分光,計測),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
後藤 基志; 澤田 圭司; 藤井 恵介; 蓮尾 昌裕; 森田 繁
日本物理学会講演概要集, 66(1), 03 Mar. 2011

25pQJ-3 コアプラズマ中の中性水素原子密度分布(25pQJ 核融合プラズマ(原子過程・分光・診断法),領域2(プラズマ基礎・プラズマ科学・核融合プラズマ・プラズマ宇宙物理))
後藤 基志; 澤田 圭司; 藤井 恵介; 蓮尾 昌裕; 森田 繁
日本物理学会講演概要集, 65(2), 18 Aug. 2010

21pHL-14 FDTD Simulation of Plasmon Distribution on Gold Nano Rod
Nakamura Hiroaki; Sawada Keiji; Maruoka Teruto; Imura Kohei; Saiki Toshiharu; Okamoto Hiromi
Meeting Abstracts of the Physical Society of Japan, 65(1), 183 - 183, 2010

A study on temperature effects on hydrogen recycling and molybdenum impurity emission from a movable limiter in TRIAM-1M Tokamak
R. Bhattacharyay; H. Zushi; K. Nakashima; T. Shikama; M. Sakamoto; N. Yoshida; S. Kado; K. Sawada; Y. Hirooka; K. Nakamura; K. Hanada; H. Idei; M. Hasegawa; K. N. Sato; M. Ogawa; O. Takaki; K. Sasaki; H. Xu; S. Kawasaki; H. Nakashima; A. Higashijima
Nuclear Fusion, 47, 864 - 874, 01 Aug. 2007
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34547793770&origin=inward

28aPS-27 Simulations of light propagation through subwavelength metal apertures on a semiconductor
Okuda M.; Deguchi K.; Nakamura H.; Sawada K.; Iwamae A.; Hasuo M.
Meeting Abstracts of the Physical Society of Japan, 61(0), 730 - 730, 2006

20pWA-8 Simulations of evanescent light generated by subwavelength slit arrays
Okuda M.; Deguchi K.; Nakamura H.; Sawada K.; Hasuo H.
Meeting abstracts of the Physical Society of Japan, 60(2), 66 - 66, 19 Aug. 2005

Local spectroscopy using optimized near-filed optical fiber probe
Saiki T.; Sawada K.; Kambe H.; Nakamura H.
Meeting abstracts of the Physical Society of Japan, 55(2), 629 - 629, 10 Sep. 2000

Numerical computation of thermoelectric and thermomagnetic effects
H. Okumura; S. Yamaguchi; H. Nakamura; K. Ikeda; K. Sawada
International Conference on Thermoelectrics, ICT, Proceedings, 89 - 92, 1998

31p-S-3 Conductivity and Hall coefficient of thermoelecric semiconductor InSb in a strong magnetic field
Nakamura H; Ikeda K; Yamaguchi S; Kuroda K; Sawada K
Meeting abstracts of the Physical Society of Japan, 52(1), 177 - 177, 17 Mar. 1997

Collisional-radiative model of molecular hydrogen
Keiji Sawada
IAEA CRP on atomic and molecular data for state-resolved modelling of hydrogen and helium and their isotopes in fusion plasma, 2016, IAEA CRP on atomic and molecular data for state-resolved modelling of hydrogen and helium and their isotopes in fusion plasma, Invited

Revision of Collisional-Radiative Models and Neutral-Transport Code for Hydrogen and Helium Species
Keiji Sawada
IAEA first Research Coordination Meeting on Atomic and Molecular Data for State-Resolved Modelling of Hydrogen and Helium and Their Isotopes in Fusion Plasma, 2011, IAEA first Research Coordination Meeting on Atomic and Molecular Data for State-Resolved Modelling of Hydrogen and Helium and Their Isotopes in Fusion Plasma, Invited

Plasma Spectroscopy