Research Output 1979 2019

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2019

28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak

Idei, H., Onchi, T., Kariya, T., Tsujimura, T. I., Kubo, S., Kobayashi, S., Sakaguchi, M., Imai, T., Hasegawa, M., Nakamura, K., Mishra, K., Fukuyama, M., Yunoki, M., Kojima, S., Watanabe, O., Kuroda, K., Hanada, K., Nagashima, Y., Ejiri, A., Matsumoto, N. & 7 others, Ono, M., Higashijima, A., Nagata, T., Shimabukoro, S., Takase, Y., Fukuyama, A. & Murakami, S., Jan 1 2019, In : Fusion Engineering and Design.

Research output: Contribution to journalArticle

Cyclotrons
Plasmas
Electrons
Electron cyclotron resonance
Test facilities

A 6 MW/m2 High Heat Flux Testing Facility of Irradiated Materials Using Infrared Plasma-Arc Lamps

Sabau, A. S., Tokunaga, K., Littleton, M. G., Kiggans, J. O., Schaich, C. R., Dinwiddie, R. B., Moore, D. T., Ueda, Y. & Katoh, Y., Oct 3 2019, In : Fusion Science and Technology. 75, 7, p. 690-701 12 p.

Research output: Contribution to journalArticle

Arc lamps
arc lamps
plasma jets
Heat flux
heat flux

Combined effect of laser thermal shock and helium ion irradiation on W-Y 2 O 3 composites

Zhang, Y. X., Tan, X. Y., Luo, L. M., Xu, Y., Zan, X., Xu, Q., Tokunaga, K., Zhu, X. Y. & Wu, Y. C., Mar 1 2019, In : Fusion Engineering and Design. 140, p. 102-106 5 p.

Research output: Contribution to journalArticle

Helium
Thermal shock
Ion bombardment
Tungsten
Lasers
1 Citation (Scopus)
plasma turbulence
method of moments
cylindrical plasmas
tomography
moments

Comparison of conditional average using threshold and template methods for quasi-periodic phenomena in plasmas

ASDEX Upgrade Team, Jan 1 2019, In : Plasma and Fusion Research. 14, 1402114.

Research output: Contribution to journalArticle

Open Access
waveforms
templates
thresholds
uniqueness
clocks
1 Citation (Scopus)

Definition of the profile gain factor and its application for internal transport barrier analysis in torus plasmas

Lhd Experiment Group, Jun 17 2019, In : Plasma Physics and Controlled Fusion. 61, 8, 085005.

Research output: Contribution to journalArticle

Plasmas
Ions
profiles
Thermal diffusion
ion temperature

Densification and microstructure evolution of W-TiC-Y2O3 during spark plasma sintering

Zhou, Y. F., Zhao, Z. Y., Tan, X. Y., Luo, L. M., Xu, Y., Zan, X., Xu, Q., Tokunaga, K., Zhu, X. Y. & Wu, Y. C., Feb 1 2019, In : International Journal of Refractory Metals and Hard Materials. 79, p. 95-101 7 p.

Research output: Contribution to journalArticle

Spark plasma sintering
Densification
Microstructure
Tungsten
Sintering

Dynamics evaluation of hydrogen isotope behavior in tungsten simulating damage distribution

Nakata, M., Azuma, K., Togari, A., Zhou, Q., Zhao, M., Toyama, T., Hatano, Y., Yoshida, N., Watanabe, H., Shimada, M., Buchenauer, D. & Oya, Y., Sep 1 2019, In : Fusion Engineering and Design. 146, p. 2096-2099 4 p.

Research output: Contribution to journalArticle

Tungsten
Isotopes
Hydrogen
Ion implantation
Deuterium

Effect of annealing on the microstructure behavior of D+-irradiated W-2vol.%TiC composite prepared by wet-chemical method

Zhang, Y. X., Tan, X. Y., Zan, X., Luo, L. M., Xu, Y., Xu, Q., Tokunaga, K., Zhu, X. Y. & Wu, Y. C., Nov 1 2019, In : Fusion Engineering and Design. 148, 111321.

Research output: Contribution to journalArticle

Annealing
Microstructure
Hot rolling
Composite materials
Ion bombardment
1 Citation (Scopus)

Estimation of fuel particle balance in steady state operation with hydrogen barrier model

Hanada, K., Yoshida, N., Takagi, I., Hirata, T., Hatayama, A., Okamoto, K., Oya, Y., Shikama, T., Wang, Z., Long, H., Huang, C., Oya, M., Idei, H., Nagashima, Y., Onchi, T., Hasegawa, M., Nakamura, K., Zushi, H., Kuroda, K., Kawasaki, S. & 10 others, Higashijima, A., Nagata, T., Shimabukuro, S., Takase, Y., Murakami, S., Gao, X., Liu, H., Qian, J., Raman, R. & Ono, M., May 1 2019, In : Nuclear Materials and Energy. 19, p. 544-549 6 p.

Research output: Contribution to journalArticle

Open Access
Hydrogen
hydrogen
Plasmas
Carrier concentration
Metals

Estimation of particle flux driven by coherent mode using of statistical conditional averaging

Kawachi, Y., Shigeru, I., Hasamada, K., Yamasaki, K., Kin, F., Kosuga, Y., Sasaki, M., Nagashima, Y., Kasuya, N., Yamada, T., Zhang, B. & fujisawa, A., Jan 1 2019, In : Plasma and Fusion Research. 14, 1402090.

Research output: Contribution to journalArticle

Open Access
flux (rate)
time lag
templates

Formation of spiral structures of turbulence driven by a strong rotation in magnetically cylindrical plasmas

Sasaki, M., Camenen, Y., Escarguel, A., Shigeru, I., Kasuya, N., Itoh, K. & Kobayashi, T., Apr 1 2019, In : Physics of Plasmas. 26, 4, 0423051.

Research output: Contribution to journalArticle

cylindrical plasmas
turbulence
vorticity
oscillations
cycles

Fourier-rectangular function analysis for cylindrical plasma images

Yamasaki, K., Fujisawa, A., Nagashima, Y., Moon, C., Inagaki, S., Kasuya, N., Kosuga, Y., Sasaki, M. & Yamada, T., Jul 28 2019, In : Journal of Applied Physics. 126, 4, 043304.

Research output: Contribution to journalArticle

cylindrical plasmas
Fourier series
tomography
cameras
profiles
1 Citation (Scopus)

Frequency and plasma condition dependent spatial structure of low frequency global potential oscillations in the TJ-II stellarator

Kobayashi, T., Losada, U., Liu, B., Estrada, T., Van Milligen, B. P., Gerrú, R., Sasaki, M. & Hidalgo, C., Mar 5 2019, In : Nuclear Fusion. 59, 4, 044006.

Research output: Contribution to journalArticle

stellarators
low frequencies
oscillations
heating
electric fields

HFS injection of X-mode for EBW conversion in QUEST

Elserafy, H., Hanada, K., Kuroda, K., Idei, H., Yoneda, R., Huang, C., Kojima, S., Hasegawa, M., Nagashima, Y., Onchi, T., Ikezoe, R., Higashijima, A., Nagata, T., Kawasaki, S., Shimabukuro, S., Bertelli, N. & Ono, M., Jan 1 2019, In : Plasma and Fusion Research. 14, 1, 1205038.

Research output: Contribution to journalArticle

injection
electrons
plasma heating
plasma currents
vessels

High voltage electrical system of 8.56 GHz CW klystron for electron cyclotron heating on QUEST spherical tokamak

Onchi, T., Idei, H., Nakamura, K., Nagata, T., Kawasaki, S., Ashida, R., Fukuyama, M., Hasegawa, M., Ikezoe, R., Higashijima, A., Kuroda, K., Nagashima, Y. & Hanada, K., Sep 1 2019, In : Fusion Engineering and Design. 146, p. 2567-2570 4 p.

Research output: Contribution to journalArticle

Cyclotrons
Insulated gate bipolar transistors (IGBT)
Heating
Electrons
Electric potential
1 Citation (Scopus)

Interpreting observations of ion cyclotron emission from large helical device plasmas with beam-injected ion populations

Reman, B. C. G., Dendy, R. O., Akiyama, T., Chapman, S. C., Cook, J. W. S., Igami, H., Shigeru, I., Saito, K. & Yun, G. S., Jul 19 2019, In : Nuclear Fusion. 59, 9, 096013.

Research output: Contribution to journalArticle

Open Access
cyclotrons
ion beams
ions
beam injection
neutral beams

Ion temperature measurement by laser-induced fluorescence spectroscopy in panta

Arakawa, H., Shigeru, I., Kosuga, Y., Sasaki, M., Kin, F., Hasamada, K., Yamasaki, K., Kobayashi, T., Yamada, T., Nagashima, Y., fujisawa, A., Kasuya, N., Itoh, K. & Itoh, S. I., Oct 1 2019, In : IEEJ Transactions on Electrical and Electronic Engineering. 14, 10, p. 1450-1454 5 p.

Research output: Contribution to journalArticle

Fluorescence spectroscopy
Temperature measurement
Plasma turbulence
Helicons
Lasers

Observation of a beam-driven low-frequency mode in Heliotron J

Zang, L. G., Yamamoto, S., Spong, D. A., Nagasaki, K., Ohshima, S., Kobayashi, S., Minami, T., Lu, X. X., Nishino, N., Kado, S., Adulsiriswad, P., Okada, H., Kenmochi, N., Shigeru, I., Zhu, J. X., Weir, G. M., Mizuuchi, T., Konoshima, S., Ishizawa, A., Yu, D. L. & 8 others, Shi, Z. B., Liu, Y., Yan, L. W., Li, J. Q., Yang, Q. W., Xu, M., Duan, X. R. & Liu, Y., Mar 14 2019, In : Nuclear Fusion. 59, 5, 056001.

Research output: Contribution to journalArticle

low frequencies
electromagnetism
ions
stellarators
neutral beams

Observations of radially elongated particle flux induced by streamer in a linear magnetized plasma

Kin, F., fujisawa, A., Itoh, K., Kosuga, Y., Sasaki, M., Shigeru, I., Nagashima, Y., Yamada, T., Kasuya, N., Yamasaki, K., Hasamada, K., Zhang, B. Y., Kawachi, Y., Arakawa, H., Kobayashi, T. & Itoh, S. I., Apr 1 2019, In : Physics of Plasmas. 26, 4, 042306.

Research output: Contribution to journalArticle

flux (rate)
cylindrical plasmas
normal density functions
ballistics
turbulence

Optical reflectivity of ion-irradiated cerium dioxide sinters

Costantini, J. M., Lelong, G., Guillaumet, M., Gourier, D., Takaki, S., Ishikawa, N., Watanabe, H. & Yasuda, K., Nov 7 2019, In : Journal of Applied Physics. 126, 17, 5100582.

Research output: Contribution to journalArticle

cerium
dioxides
reflectance
ions
irradiation
1 Citation (Scopus)

Optical spectroscopy study of modifications induced in cerium dioxide by electron and ion irradiations

Costantini, J. M., Gutierrez, G., Watanabe, H., Yasuda, K., Takaki, S., Lelong, G., Guillaumet, M. & Weber, W. J., Jul 18 2019, In : Philosophical Magazine. 99, 14, p. 1695-1714 20 p.

Research output: Contribution to journalArticle

electron irradiation
cerium
ion irradiation
dioxides
refractivity

Parallel flow driven instability due to toroidal return flow in high-confinement mode plasmas

Sasaki, M., Itoh, K., Kosuga, Y., Dong, J. Q., Shigeru, I., Kobayashi, T., Cheng, J., Zhao, K. J. & Itoh, S. I., May 20 2019, In : Nuclear Fusion. 59, 6, 066039.

Research output: Contribution to journalArticle

parallel flow
destabilization
shear flow
stabilization
turbulence

Plasma equilibrium based on EC-driven current profile with toroidal rotation on QUEST

Nakamura, K., Alam, M. M., Jiang, Y. Z., Mitarai, O., Takechi, M., Hasegawa, M., Tokunaga, K., Hanada, K., Idei, H., Nagashima, Y., Onchi, T., Kuroda, K., Watanabe, O., Higashijima, A., Nagata, T., Shimabukuro, S., Kawasaki, S. & Fukuyama, A., Sep 2019, In : Fusion Engineering and Design. 146, p. 2628-2631 4 p.

Research output: Contribution to journalArticle

Plasmas
Current density
Fluxes

Roles of solitary eddy and splash in drift wave-zonal flow system in a linear magnetized plasma

Arakawa, H., Sasaki, M., Shigeru, I., Kosuga, Y., Kobayashi, T., Kasuya, N., Yamada, T., Nagashima, Y., Kin, F., fujisawa, A., Itoh, K. & Itoh, S. I., May 1 2019, In : Physics of Plasmas. 26, 5, 052305.

Research output: Contribution to journalArticle

Open Access
vortices
solitary waves
life (durability)
flux (rate)
damping

Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD

Moon, C., Kobayashi, T., Ida, K., Tokuzawa, T., Hidalgo, C., Yoshinuma, M., Ogawa, K., Itoh, K. & Fujisawa, A., Sep 1 2019, In : Physics of Plasmas. 26, 9, 092302.

Research output: Contribution to journalArticle

Open Access
flow velocity
low frequencies
reflectometers
propagation velocity
proximity

Stable structure of hydrogen atoms trapped in tungsten divacancy

Ohsawa, K., Toyama, T., Hatano, Y., Yamaguchi, M. & Watanabe, H., Dec 15 2019, In : Journal of Nuclear Materials. 527, 151825.

Research output: Contribution to journalArticle

Tungsten
Hydrogen
hydrogen atoms
tungsten
Atoms

Study of turbulence intermittency in linear magnetized plasma

Zhang, B., Inagaki, S., Hasamada, K., Yamasaki, K., Kin, F., Nagashima, Y., Yamada, T. & Fujisawa, A., Oct 7 2019, In : Plasma Physics and Controlled Fusion. 61, 11, 115010.

Research output: Contribution to journalArticle

Open Access
intermittency
Turbulence
turbulence
Plasmas
Autocorrelation
1 Citation (Scopus)

Summary of the 8th Asia-Pacific Transport Working Group (APTWG) Meeting

Shi, Z. B., Cheng, J., Xu, Y. H., Tokuzawa, T., Qiu, Z. Y., Sasaki, M., Zhong, W. L., Ida, K., Wang, Z. X., Zhang, T., Kim, J., Kwon, J. M., Kobayashi, T. & Lee, W. C., Jan 17 2019, In : Nuclear Fusion. 59, 4, 047001.

Research output: Contribution to journalArticle

turbulence
energetic particles
particle energy
China
topology

Using dynamical mode decomposition to extract the limit cycle dynamics of modulated turbulence in a plasma simulation

Sasaki, M., Kawachi, Y., Dendy, R. O., Arakawa, H., Kasuya, N., Kin, F., Yamasaki, K. & Inagaki, S., Oct 11 2019, In : Plasma Physics and Controlled Fusion. 61, 11, 112001.

Research output: Contribution to journalArticle

Plasma simulation
Turbulence
turbulence
Decomposition
decomposition
2018

Density dependence of transient electron thermal transport property in LHD

Experiment Group, L. H. D., Kobayashi, T., Ida, K., Tsujimura, T., Shigeru, I., Tokuzawa, T., Tsuchiya, H., Tamura, N., Igami, H., Yoshimura, Y., Itoh, S. I. & Itoh, K., Oct 29 2018, In : Nuclear Fusion. 58, 12, 126031.

Research output: Contribution to journalArticle

transport properties
hysteresis
electrons
heating
estimates
2 Citations (Scopus)

Density profile measurement with a heavy ion beam probe in a toroidal plasma of the compact helical system

Shimizu, A., fujisawa, A., Ohshima, S., Nakano, H., Minami, T., Isobe, M., Okamura, S. & Matsuoka, K., Nov 1 2018, In : Review of Scientific Instruments. 89, 11, 113507.

Research output: Contribution to journalArticle

toroidal plasmas
electron density profiles
Heavy ions
Ion beams
Carrier concentration
2 Citations (Scopus)

Determination of spatiotemporal structure of fluctuations by statistical averaging method

Kawachi, Y., Shigeru, I., Tomita, K., Yamasaki, K., Kin, F., Kosuga, Y., Sasaki, M., Nagashima, Y., Kasuya, N., Hasamada, K., Zhang, B. & fujisawa, A., Jan 1 2018, In : Plasma and Fusion Research. 13, 3401105.

Research output: Contribution to journalArticle

Open Access
wave fronts
pattern recognition
profiles
3 Citations (Scopus)

Effect of heating temperature on tritium retention in stainless steel type 316 L

Matsuyama, M., Zushi, H., Tokunaga, K., Kuzmin, A. & Hanada, K., Aug 1 2018, In : Nuclear Materials and Energy. 16, p. 52-59 8 p.

Research output: Contribution to journalArticle

Tritium
Stainless Steel
tritium
stainless steels
Stainless steel
2 Citations (Scopus)

Effect of laser beam thermal shock on the helium ion irradiation damage behavior of W-TiC-Y2O3 composites

Xu, MY. Y., Luo, LM. M., Xu, Y., Zan, X., Xu, Q., Tokunaga, K., Zhu, XY. Y. & Wu, YC. C., Oct 1 2018, In : Journal of Nuclear Materials. 509, p. 198-203 6 p.

Research output: Contribution to journalArticle

Helium
thermal shock
helium ions
Thermal shock
Ion bombardment

Effect of magnetic shear on edge turbulence in SOL-like open field line configuration in QUEST

Banerjee, S., Zushi, H., Nishino, N., Hanada, K., Idei, H., Nakamura, K., Hasegawa, M., fujisawa, A., Nagashima, Y., Mishra, K., Tashima, S., Onchi, T., Kuzmin, A. & Matsuoka, K., Jun 28 2018, In : Plasma Physics and Controlled Fusion. 60, 8, 085014.

Research output: Contribution to journalArticle

Turbulence
turbulence
Magnetic fields
shear
Plasmas

Effects of an alloying element on a c-component loop formation and precipitate resolution in Zr alloys during ion irradiation

Watanabe, H., Takahashi, K., Yasunaga, K., Wang, Y., Aono, Y., Maruno, Y. & Hashizume, K., Oct 3 2018, In : journal of nuclear science and technology. 55, 10, p. 1212-1224 13 p.

Research output: Contribution to journalArticle

Alloying elements
Ion bombardment
ion irradiation
Zircaloy 2 (trademark)
alloying

Evaluation of measurement signal of heavy ion beam probe of energetic-particle driven geodesic acoustic modes

Sasaki, M., Itoh, K., Ido, T., Shimizu, A., Kobayashi, T., Arakawa, H., Kasuya, N., fujisawa, A. & Itoh, S. I., Jan 1 2018, In : Plasma and Fusion Research. 13, 3403040.

Research output: Contribution to journalArticle

Open Access
signal measurement
energetic particles
heavy ions
ion beams
acoustics
5 Citations (Scopus)

Extraction of nonlinear waveform in turbulent plasma

Kin, F., Itoh, K., fujisawa, A., Kosuga, Y., Sasaki, M., Yamada, T., Shigeru, I., Itoh, S., Kobayashi, T., Nagashima, Y., Kasuya, N., Arakawa, H., Yamasaki, K. & Hasamada, K., Jun 1 2018, In : Physics of Plasmas. 25, 6, 062304.

Research output: Contribution to journalArticle

waveforms
envelopes
harmonics
cylindrical plasmas
solitary waves

Fatigue pre-cracking and fracture toughness in polycrystalline tungsten and molybdenum

Taguchi, K., Nakadate, K., Matsuo, S., Tokunaga, K. & Kurishita, H., Jan 1 2018, In : Journal of Nuclear Materials. 498, p. 445-457 13 p.

Research output: Contribution to journalArticle

Tungsten
Molybdenum
toughness
fracture strength
molybdenum

Global mode analysis of ion-temperature-gradient instabilities using the gyro-fluid model in linear devices

Ohno, T., Kasuya, N., Sasaki, M. & Yagi, M., Jan 1 2018, In : Plasma and Fusion Research. 13, 1401081.

Research output: Contribution to journalArticle

Open Access
ion temperature
temperature gradients
fluids
destabilization
boundary conditions

Heat loading behavior and thermomechanical analyses on plasma spray tungsten coated reduced-activation ferritic/martensitic steel

Tokunaga, K., Hotta, T., Araki, K., Kurumada, A., Tokitani, M., Masuzaki, S., Ezato, K., Suzuki, S., Enoeda, M., Akiba, M., Hasegawa, M. & Nakamura, K., Nov 1 2018, In : Fusion Engineering and Design. 136, p. 1624-1628 5 p.

Research output: Contribution to journalArticle

Martensitic steel
Tungsten
Plasma spraying
Ferritic steel
Chemical activation
1 Citation (Scopus)

Helium irradiation behavior of tungsten-niobium alloys under different ion energies

Xu, M. Y., Luo, L. M., Zhou, Y. F., Zan, X., Xu, Y., Xu, Q., Tokunaga, K., Zhu, X. Y. & Wu, Y. C., Jul 1 2018, In : Fusion Engineering and Design. 132, p. 7-12 6 p.

Research output: Contribution to journalArticle

Niobium alloys
Tungsten alloys
Helium
Irradiation
Ions
3 Citations (Scopus)

Initial results from solenoid-free plasma start-up using Transient CHI on QUEST

Kuroda, K., Raman, R., Hanada, K., Hasegawa, M., Onchi, T., Ono, M., Nelson, B. A., Jarboe, T. R., Nagata, M., Mitarai, O., Nakamura, K., Idei, H., Rogers, J., Kawasaki, S., Nagata, T., Kuzmin, A., Kojima, S., Huang, C., Watanabe, O., Higashijima, A. & 3 others, Takase, Y., Fukuyama, A. & Murakami, S., Sep 14 2018, In : Plasma Physics and Controlled Fusion. 60, 11, 115001.

Research output: Contribution to journalArticle

Solenoids
solenoids
injection
Plasmas
Electrodes

Microstructure and peeling behavior of MOCVD processed oxide insulator coating before and after ion beam irradiation

Hishinuma, Y., Tanaka, M., Tanaka, T., Matsuda, K., Watanabe, H. & Muroga, T., Aug 1 2018, In : Nuclear Materials and Energy. 16, p. 123-127 5 p.

Research output: Contribution to journalArticle

peeling
Peeling
Bond strength (materials)
Metallorganic chemical vapor deposition
Oxides
1 Citation (Scopus)

Microstructure and transient laser thermal shock behavior of W–TiC–Y2O3 composites prepared by wet chemical method

Xu, MY. Y., Luo, LM. M., Lin, JS. S., Xu, Y., Zan, X., Xu, Q., Tokunaga, K., Zhu, XY. Y. & Wu, YC. C., Oct 25 2018, In : Journal of Alloys and Compounds. 766, p. 784-790 7 p.

Research output: Contribution to journalArticle

Thermal shock
Microstructure
Lasers
Composite materials
Facings

Microwave frequency comb Doppler reflectometer applying fast digital data acquisition system in LHD

Tokuzawa, T., Tsuchiya, H., Tsujimura, T., Emoto, M., Nakanishi, H., Inagaki, S., Ida, K., Yamada, H., Ejiri, A., Watanabe, K. Y., Oguri, K., Akiyama, T., Tanaka, K. & Yamada, I., Oct 1 2018, In : Review of Scientific Instruments. 89, 10, 10H118.

Research output: Contribution to journalArticle

digital data
reflectometers
Reflectometers
Microwave frequencies
microwave frequencies
2 Citations (Scopus)

Modification of plasma control system and hot-wall temperature control system for long-duration plasma sustainment in QUEST

Hasegawa, M., Nakamura, K., Hanada, K., Kawasaki, S., Kuzmin, A., Idei, H., Tokunaga, K., Nagashima, Y., Onchi, T., Kuroda, K., Watanabe, O., Higashijima, A. & Nagata, T., Apr 1 2018, In : Fusion Engineering and Design. 129, p. 202-206 5 p.

Research output: Contribution to journalArticle

Temperature control
Plasmas
Control systems
Facings
Cooling systems

Numerical diagnostics of fluctuation spectrum in 3D magnetic configurations

Kasuya, N., Nunami, M., Tanaka, K. & Yagi, M., Aug 30 2018, In : Nuclear Fusion. 58, 10, 106033.

Research output: Contribution to journalArticle

configurations
ion temperature
temperature gradients
spatial resolution
phase contrast
1 Citation (Scopus)
cylindrical plasmas
inhomogeneity
damping
shape functions
magnetohydrodynamic flow