Doctor of Engineering, kyoto University

Fundamental plasma, Plasma science

1983 - 1987, Kyoto University

1989, Kyoto University

1994, Kyoto University

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

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

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

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

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

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

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, 2022, Refereed

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, 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), SAAB08, 2020, Refereed

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., e201900152, 2020, Refereed

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, 44, 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

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

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., e201900153, 2020, Refereed

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, Refereed

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

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, Refereed

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, 84001-84005, 2016, Refereed

Photon Trapping Effects in DEMO Divertor Plasma
K. Hoshino, K. Sawada, R. Idei, S. Tokunaga, N. Asakura, K. Shimizu, N. Ohno
Contrib. Plasma Phys, 56, 657–662, 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

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, 2015, 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, 650-653, 2015, Refereed

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, Refereed

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 and Radiative Transfer, 137, 23-28, 2014, Refereed

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, 304–307, 2014, Refereed

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
Contrib. Plasma Phys., 53, 81-85, 2013, Refereed

Deuterium atomic density estimation in recombining plasmas using self‐absorption spectroscopy
S. Kajita, T. Nishiwaki, N. Ohno, Noriyasu, K. Sawada, M. Takagi
IEEJ Transactions on Electrical and Electronic Engineering, 8, 1-6, 2013, Refereed

Optical Emission and Mass Spectra Observations during Hydrogen Combustion in Atmospheric Pressure Microwave Plasma
N. Ezumi, K. Akahane, K. Sawada, Y. Tanaka, M. Tanaka, T. Uda and K. Nishimura
Plasma and Fusion Research, 7, 2401075, 2012, Refereed

Spectroscopic diagnostic of helium-hydrogen rf plasma under the influence of radiation trapping
K. Sawada, M. Goto, N. Ezumi
Plasma and Fusion Res., 6, 1401010, 2011, Refereed

Evaluation of hydrogen atom density in the plasma core regionbased on the Balmer-αline profile
M. Goto, K. Sawada, K. Fujii, M. Hasuo, S. Morita
Nucl. Fusion, 51, 23005, 2011, Refereed

A Collisional-Radiative Model for Hydrogen Atom Including Velocity Changing Collisions
Keisuke FUJII, Taiichi SHIKAMA, Keiji SAWADA, Motoshi GOTO, Shigeru MORITA and Masahiro HASUO
Plasma and Fusion Research, 6, 2401125, 2011, Refereed

Atomic and molecular processes with lithium in peripheral plasmas
I. Murakami, D. Kato, Y. Hirooka, K. Sawada
Fusion Engineering and Design, (85), 854–857, 2010, Refereed

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, 2010, Refereed

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, 2010, Refereed

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, 001, 2010, Refereed

Development of multiwavelength-range fine-resolution spectrometer for hydrogen emissions and its applicationto 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
Rev. Sci. Instrum., 81(3), 033106, 2010, Refereed

Alignment creation and deviation from statistical population distribution in hydrogenn = 3 levels observed on MSE spectra of LHD plasma
A. Iwamae, A. Sakaue, M. Atake, K. Sawada, M. Goto, S. Morita
Plasma Phys. Control. Fusion, 51, 115004, 2009, Refereed

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, 2009, Refereed

Simulation of electric quadrupole and magnetic dipole transition efficiencies in optical near fields generated by a subwavelength slit array
K. Deguchi, M. Okuda, A. Iwamae, H. Nakamura, K. Sawada and M. Hasuo
J. Phys. Soc. Jpn., 78, 024301, 2009, Refereed

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, 2007, Refereed

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
J. Nucl. Mater., 363-365, 395-399, 2007, Refereed

Detailed atomic, molecular and radiation kinetics in current 2D and 3D edge plasmafluid codes
D. Reiter, V. Kotov, P. Börner, K. Sawada, R.K. Janev, B. Kuppers
363-365, 649-657, 2007, Refereed

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
J. Nucl. Mater., 363-365, 938-943, 2007, Refereed

FDTD modeling of polarization near-field scanning optical microscope
K. Sawada, M. Sakai, Y. Kohashi, T. Saiki and H. Nakamura
J. Plasma Physics, 72, 1019-1023, 2006, Refereed

Iterative numerical method for inclusion of radiation trapping into collisional-radiative model
K. Sawada
J. Plasma Physics, 72, 1025-1029, 2006, Refereed

Simulation of optical near field of a sub-wavelength gold slit array and its electric quadrupole interactionwith 1s excitons in Cu2O
M. Okuda, K. Deguchi, A. Iwamae, N. Nakamura, K. Sawada, M. Hasuo
Phys. Stat. Sol., c 3, 3547-3552, 2006, Refereed

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

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

Spectroscopic study of hydrogen particlebehavior 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
J. Nucl. Mater., 337-339, 161-165, 2005

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

FDTD analysis of a near-field optical fiber probe with a double tapered structure
Sawada, K; Nakamura, H; Kambe, H; Saiki, T
IEICE Transactions on Electronics, E85C(12), 2055-2058, 2002, Refereed

Effect of initial vibrational excitation of molecular hydrogen on molecular assisted recombination in divertor plasmas
Sawada, K; Fujimoto, T
Contributions to Plasma Physics, 42(6-7), 603-607, 2002, Refereed

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

Emission radiation of hydrogen and helium atoms and ions a plasma
Goto, M; Sawada, K; Fujimoto, T
Contributions to Plasma Physics, 42(2-4), 212-217, 2002, Refereed

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

Ultraviolet photoemission studies of valence bands in lead halides
Itoh, M; Shiokawa, T; Sawada, K; Kamada, M
Journal of the Physical Society of Japan, 67(6), 2140-2141, 1998, Refereed

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

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

EFFECTIVE IONIZATION AND DISSOCIATION RATE COEFFICIENTS OF MOLECULAR-HYDROGEN IN PLASMA
Sawada, K; Fujimoto, T
JOURNAL OF APPLIED PHYSICS, 78(5), 2913-2924, 1995, Refereed

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