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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
1 Citation (Scopus)

Adaptive-Array electron cyclotron emission diagnostics using data streaming in a software defined radio system

Idei, H., Mishra, K., Yamamoto, M. K., Hamasaki, M., Fujisawa, A., Nagashima, Y., Hayashi, Y., Onchi, T., Hanada, K. & Zushi, H., Apr 14 2016, In : Journal of Instrumentation. 11, 4, C04010.

Research output: Contribution to journalArticle

Streaming Data
Radio systems
Cyclotrons
cyclotrons
Diagnostics
1 Citation (Scopus)

Analysis of plasma equilibrium based on orbit-driven current density profile in steady-state plasma on QUEST

Nakamura, K., Alam, M. M., Jiang, Y. Z., Mitarai, O., Kurihara, K., Kawamata, Y., Sueoka, M., Takechi, M., Hasegawa, M., Tokunaga, K., Araki, K., Zushi, H., Hanada, K., Fujisawa, A., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A., Nagata, T. & 1 others, Fukuyama, A., Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1528-1533 6 p.

Research output: Contribution to journalArticle

Orbits
Current density
Plasmas
Hamiltonians
MATLAB
3 Citations (Scopus)

Comparative studies of inner and outer divertor discharges and a fueling study in QUEST

QUEST group, Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1365-1370 6 p.

Research output: Contribution to journalArticle

Fueling
Plasmas
Inductance
Solenoids
Electrodes
2 Citations (Scopus)

Comparison between Full Wave and ray-tracing calculations to examine scenarios for electron bernstein wave heating in LHD

Igami, H., Fukuyama, A., Idei, H., Nagasaki, K., Goto, Y., Kubo, S., Shimozuma, T., Yoshimura, Y., Takahashi, H., Tsujimura, T. I. & Makino, R., Jan 1 2016, In : Plasma and Fusion Research. 11, 1, 2403098.

Research output: Contribution to journalArticle

ray tracing
heating
electrons
trajectories
cut-off
4 Citations (Scopus)

Comparison between non-inductive plasma current start-up using ECRH with and without fundamental resonance on QUEST

Miura, H., Hanada, K., Zushi, H., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M., Nakashima, H., Kawasaki, S., Higashijima, A., Mitarai, O., Fukuyama, A. & Takase, Y., Jan 1 2015, In : Plasma and Fusion Research. 10, 3402066.

Research output: Contribution to journalArticle

plasma currents
electron cyclotron resonance
heating
electron energy
microwaves
2 Citations (Scopus)

Comparison of current density profiles based on particle orbit-driven current in steady-state plasma on QUEST

Alam, M. M., Nakamura, K., Xia, F., Mitarai, O., Hasegawa, M., Tokunaga, K., Araki, K., Zushi, H., Hanada, K., Fujisawa, A., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A. & Nagata, T., Jan 1 2016, In : Fusion Engineering and Design. 109-111, p. 1624-1630 7 p.

Research output: Contribution to journalArticle

Orbits
Current density
Plasmas
Cyclotrons
Electrons
3 Citations (Scopus)

Conceptual Design of Dual Baseline-Frequency Fast Directional Switch using Square Corrugated Waveguide Splitter/Combiner

Idei, H., Kobayashi, T., Moriyama, S., Isayama, A., Sakaguchi, M. & Kasparek, W., Jul 5 2015, In : Journal of Infrared, Millimeter, and Terahertz Waves. 36, 7, p. 662-674 13 p.

Research output: Contribution to journalArticle

corrugated waveguides
Conceptual design
Waveguides
switches
Switches
7 Citations (Scopus)

Current start-up using the new CHI system

Kuroda, K., Raman, R., Hanada, K., Hasegawa, M., Onchi, T., Ono, M., Jaboe, T., Nelson, B. A., Nagata, M., Mitarai, O., Nakamura, K., Idei, H., Rogers, J., Kawasaki, S., Nagata, T., Kuzmin, A., Kojima, S., Watanabe, O., Higashijima, A., Takase, Y. & 1 others, Fukuyama, A., Jan 1 2017, In : Plasma and Fusion Research. 12, 1202020.

Research output: Contribution to journalArticle

injection
magnetic flux
breakdown
gases
4 Citations (Scopus)

Current status and prospect of plasma control system for steady-state operation on QUEST

Hasegawa, M., Nakamura, K., Zushi, H., Hanada, K., fujisawa, A., Tokunaga, K., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H. & Higashijima, A., Nov 15 2016, In : Fusion Engineering and Design. 112, p. 699-702 4 p.

Research output: Contribution to journalArticle

Plasmas
Control systems
Fueling
Low pass filters
Digital filters
3 Citations (Scopus)

Development of 28 GHz Gyrotron for Cooperative ECH Study

Kariya, T., Minami, R., Imai, T., Kato, T., Idei, H., Hanada, K., Zushi, H., Numakura, T., Endo, Y. & Ichimura, M., Jul 1 2015, In : Fusion Science and Technology. 68, 1, p. 147-151 5 p.

Research output: Contribution to journalArticle

electron cyclotron heating
Cyclotrons
Heating
Electrons
plasma currents
6 Citations (Scopus)

Development of a high-performance control system by decentralization with reflective memory on QUEST

Hasegawa, M., Nakamura, K., Zushi, H., Hanada, K., Fujisawa, A., Mitarai, O., Tokunaga, K., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H. & Higashijima, A., Oct 1 2015, In : Fusion Engineering and Design. 96-97, p. 629-632 4 p.

Research output: Contribution to journalArticle

Plasmas
Control systems
Data storage equipment
Program processors
Distributed parameter control systems
10 Citations (Scopus)

Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range

Kariya, T., Imai, T., Minami, R., Numakura, T., Eguchi, T., Kato, T., Endo, Y., Ichimura, M., Shimozuma, T., Kubo, S., Takahashi, H., Yoshimura, Y., Igami, H., Ito, S., Mutoh, T., Sakamoto, K., Idei, H., Zushi, H., Nagasaki, K., Sano, F. & 2 others, Ono, M. & Mitsunaka, Y., Aug 5 2015, In : Nuclear Fusion. 55, 9, 093009.

Research output: Contribution to journalArticle

cyclotron resonance devices
fusion
frequency ranges
continuous radiation
electron cyclotron heating

Development of high power gyrotrons for advanced fusion devices

Kariya, T., Minami, R., Imai, T., Okada, M., Motoyoshi, F., Numakura, T., Nakashima, Y., Idei, H., Onchi, T., Hanada, K., Shimozuma, T., Yoshimura, Y., Takahashi, H., Kubo, S., Oda, Y., Ikeda, R., Sakamoto, K., Ono, M., Nagasaki, K., Eguchi, T. & 1 others, Mitsunaka, Y., Apr 26 2019, In : Nuclear Fusion. 59, 6, 066009.

Research output: Contribution to journalArticle

cyclotron resonance devices
fusion
radio frequencies
continuous radiation
output
8 Citations (Scopus)

Development of over-MW gyrotrons for fusion at 14 GHz to sub-THz frequencies

Kariya, T., Imai, T., Minami, R., Sakamoto, K., Oda, Y., Ikeda, R., Shimozuma, T., Kubo, S., Idei, H., Numakura, T., Tsumura, K., Ebashi, Y., Okada, M., Nakashima, Y., Yoshimura, Y., Takahashi, H., Ito, S., Hanada, K., Nagasaki, K., Ono, M. & 2 others, Eguchi, T. & Mitsunaka, Y., Apr 11 2017, In : Nuclear Fusion. 57, 6, 066001.

Research output: Contribution to journalArticle

cyclotron resonance devices
fusion
output
oscillations
tubes
3 Citations (Scopus)

Dynamical programming based turbulence velocimetry for fast visible imaging of tokamak plasma

Banerjee, S., Zushi, H., Nishino, N., Mishra, K., Onchi, T., Kuzmin, A., Nagashima, Y., Hanada, K., Nakamura, K., Idei, H., Hasegawa, M. & Fujisawa, A., Mar 1 2015, In : Review of Scientific Instruments. 86, 3, 033505.

Research output: Contribution to journalArticle

programming
Velocity measurement
Turbulence
turbulence
Plasmas

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
3 Citations (Scopus)

Effect of magnetic structure on RF-induced breakdown in QUEST

Yoneda, R., Hanada, K., Nakamura, K., Idei, H., Yoshida, N., Hasegawa, M., Onchi, T., Kuroda, K., Kawasaki, S., Higashijima, A., Nagata, T., Isayama, A., Mitarai, O., Fukuyama, A. & Takase, Y., Jun 1 2017, In : Physics of Plasmas. 24, 6, 062513.

Research output: Contribution to journalArticle

radio frequencies
breakdown
life (durability)
electrons
thresholds
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 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
18 Citations (Scopus)

Flow damping due to stochastization of the magnetic field

Ida, K., Yoshinuma, M., Tsuchiya, H., Kobayashi, T., Suzuki, C., Yokoyama, M., Shimizu, A., Nagaoka, K., Inagaki, S., Itoh, K., Akiyama, T., Emoto, M., Evans, T., Dinklage, A., Du, X., Fujii, K., Goto, M., Goto, T., Hasuo, M., Hidalgo, C. & 101 others, Ichiguchi, K., Ishizawa, A., Jakubowski, M., Kamiya, K., Kasahara, H., Kawamura, G., Kato, D., Kobayashi, M., Morita, S., Mukai, K., Murakami, I., Murakami, S., Narushima, Y., Nunami, M., Ohdach, S., Ohno, N., Osakabe, M., Pablant, N., Sakakibara, S., Seki, T., Shimozuma, T., Shoji, M., Sudo, S., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., Yamada, H., Takeiri, Y., Mutoh, T., Imagawa, S., Mito, T., Nagayama, Y., Watanabe, K. Y., Ashikawa, N., Chikaraishi, H., Ejiri, A., Furukawa, M., Fujita, T., Hamaguchi, S., Igami, H., Isobe, M., Masuzaki, S., Morisaki, T., Motojima, G., Nagasaki, K., Nakano, H., Oya, Y., Suzuki, Y., Sakamoto, R., Sakamoto, M., Sanpei, A., Takahashi, H., Tokitani, M., Ueda, Y., Yoshimura, Y., Yamamoto, S., Nishimura, K., Sugama, H., Yamamoto, T., Idei, H., Isayama, A., Kitajima, S., Masamune, S., Shinohara, K., Bawankar, P. S., Bernard, E., Von Berkel, M., Funaba, H., Huang, X. L., Ii, T., Ido, T., Ikeda, K., Kamio, S., Kumazawa, R., Moon, C., Muto, S., Miyazawa, J., Ming, T., Nakamura, Y., Nishimura, S., Ogawa, K., Ozaki, T., Oishi, T., Ohno, M., Pandya, S., Seki, R., Sano, R., Saito, K., Sakaue, H., Takemura, Y., Tsumori, K., Tamura, N., Tanaka, H., Toi, K., Wieland, B., Yamada, I., Yasuhara, R., Zhang, H., Kaneko, O. & Komori, A., Jan 8 2015, In : Nature communications. 6, 5816.

Research output: Contribution to journalArticle

Magnetic Fields
Damping
damping
Magnetic fields
magnetic fields
11 Citations (Scopus)

Fully non-inductive second harmonic electron cyclotron plasma ramp-up in the QUEST spherical tokamak

Idei, H., Kariya, T., Imai, T., Mishra, K., Onchi, T., Watanabe, O., Zushi, H., Hanada, K., Qian, J., Ejiri, A., Alam, M. M., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Fukuyama, A., Kubo, S., Shimozuma, T., Yoshikawa, M. & 8 others, Sakamoto, M., Kawasaki, S., Nakashima, H., Higashijima, A., Ide, S., Maekawa, T., Takase, Y. & Toi, K., Oct 5 2017, In : Nuclear Fusion. 57, 12, 126045.

Research output: Contribution to journalArticle

plasma currents
ramps
cyclotrons
harmonics
electrons
12 Citations (Scopus)

Global gas balance and influence of atomic hydrogen irradiation on the wall inventory in steady-state operation of QUEST tokamak

Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., Rusinov, A., Inoue, Y., Hirooka, Y., Zhou, H., Kobayashi, M., Sakamoto, M., Hanada, K., Yoshida, N., Nakamura, K., Fujisawa, A., Matsuoka, K., Idei, H., Nagashima, Y., Hasegawa, M., Onchi, T., Banerjee, S. & 1 others, Mishra, K., Jul 22 2015, In : Journal of Nuclear Materials. 463, p. 1087-1090 4 p., 48824.

Research output: Contribution to journalArticle

Hydrogen
Gases
pulse frequency modulation
Irradiation
Plasmas
1 Citation (Scopus)

Guiding Center Orbit Calculation for Evaluating the Current Density Distributions of the Electrons in Electron Cyclotron Heating on QUEST

Alam, M. M., Nakamura, K., Idei, H., Hasegawa, M., Tokunaga, K., Araki, K., Hanada, K., Fujisawa, A., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A., Xia, F. & Mitarai, O., Sep 2016, In : IEEE Transactions on Plasma Science. 44, 9, p. 1666-1671 6 p., 7482769.

Research output: Contribution to journalArticle

orbit calculation
electron cyclotron heating
density distribution
current density
electrons
2 Citations (Scopus)

Heat flux and plasma flow in the far scrape-off layer of the inboard poloidal field null configuration in QUEST

Onchi, T., Zushi, H., Mishra, K., Mahira, Y., Nagaoka, K., Hanada, K., Idei, H., Hasegawa, M., Nakamura, K., Fujisawa, A., Nagashima, Y., Matsuoka, K., Tashima, S., Banerjee, S., Kuzmin, A., Kawasaki, S., Nakashima, H., Higashijima, A. & Watanabe, O., Aug 1 2015, In : Physics of Plasmas. 22, 8, 082513.

Research output: Contribution to journalArticle

magnetohydrodynamic flow
heat flux
configurations
oscillations
supersonic flow

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
3 Citations (Scopus)

Hydrogen flux measurements with permeation probes in spherical tokamak QUEST

Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., Hirooka, Y., Kobayashi, M., Sakamoto, M., Hanada, K., Onchi, T., Oyama, Y., Youshida, N., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M. & Mishra, K., Jul 1 2016, In : Vacuum. 129, p. 178-182 5 p.

Research output: Contribution to journalArticle

Permeation
Hydrogen
Fluxes
probes
hydrogen
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
8 Citations (Scopus)

Investigation of hydrogen recycling in long-duration discharges and its modification with a hot wall in the spherical tokamak QUEST

Hanada, K., Yoshida, N., Honda, T., Wang, Z., Kuzmin, A., Takagi, I., Hirata, T., Oya, Y., Miyamoto, M., Zushi, H., Hasegawa, M., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Watanabe, O., Onchi, T., Kuroda, K., Long, H., Watanabe, H. & 7 others, Tokunaga, K., Higashijima, A., Kawasaki, S., Nagata, T., Takase, Y., Fukuyama, A. & Mitarai, O., Oct 26 2017, In : Nuclear Fusion. 57, 12, 126061.

Research output: Contribution to journalArticle

recycling
hydrogen
wall temperature
hydrogen fuels
maintenance
2 Citations (Scopus)

Kinetic full wave analysis of electron cyclotron wave mode conversion in tokamak plasmas

Khan, S. A., Fukuyama, A., Igami, H. & Idei, H., Jan 1 2016, In : Plasma and Fusion Research. 11, Specialissue1, 2403070.

Research output: Contribution to journalArticle

cyclotrons
formulations
Larmor radius
kinetics
boundary value problems
3 Citations (Scopus)

Measurement of thickness of film deposited on the plasma-facing wall in the QUEST tokamak by colorimetry

Wang, Z., Hanada, K., Yoshida, N., Shimoji, T., Miyamoto, M., Oya, Y., Zushi, H., Idei, H., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Kawasaki, S., Higashijima, A., Nakashima, H., Nagata, T., Kawaguchi, A., Fujiwara, T., Araki, K., Mitarai, O. & 3 others, Fukuyama, A., Takase, Y. & Matsumoto, K., Sep 1 2017, In : Review of Scientific Instruments. 88, 9, 093502.

Research output: Contribution to journalArticle

colorimetry
Colorimetry
Facings
Plasmas
radioactive materials
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

Multiple wall-reflection effect in adaptive-array differential-phase reflectometry on QUEST

Idei, H., Mishra, K., Yamamoto, M. K., fujisawa, A., Nagashima, Y., Hamasaki, M., Hayashi, Y., Onchi, T., Hanada, K. & Zushi, H., Jan 13 2016, In : Journal of Instrumentation. 11, 1, C01014.

Research output: Contribution to journalArticle

Reflectometry
Fast Fourier transform
Fast Fourier transforms
Derivatives
computer programs

Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high βp plasma in QUEST

Banerjee, S., Zushi, H., Nishino, N., Mishra, K., Mahira, Y., Tashima, S., Ejiri, A., Yamaguchi, T., Onchi, T., Nagashima, Y., Hanada, K., Nakamura, K., Idei, H., Hasegawa, M., Fujisawa, A., Kuzmin, A. & Matsuoka, K., Aug 1 2016, In : Physics of Plasmas. 23, 8, 082507.

Research output: Contribution to journalArticle

cyclotrons
electrons
magnetohydrodynamic flow
configurations
turbulence
1 Citation (Scopus)

Observation of heat flux and plasma flow in scrape off layer in QUEST

Onchi, T., Mahira, Y., Nagaoka, K., Tashima, S., Banerjee, S., Mishra, K., Idei, H., Hanada, K., Nakamura, K., Fujisawa, A., Nagashima, Y., Hasegawa, M., Matsuoka, K., Kuzmin, A., Watanabe, O., Kawasaki, S., Nakashima, H. & Higashijima, A., Jul 22 2015, In : Journal of Nuclear Materials. 463, p. 428-431 4 p., 48807.

Research output: Contribution to journalArticle

Plasma flow
magnetohydrodynamic flow
Heat flux
heat flux
Langmuir probes
6 Citations (Scopus)

Optimization of the high harmonic ECRH scenario to extend a heating plasma parameter range in LHD

The LHD Experiment Group, Jun 1 2015, In : Nuclear Fusion. 55, 6, 063035.

Research output: Contribution to journalArticle

plasma heating
electron cyclotron resonance
injection
harmonics
optimization
2 Citations (Scopus)

Optimized design of polarizers with low ohmic loss and any polarization state for the 28 GHz QUEST ECH/ECCD system

Tsujimura, T. I., Idei, H., Kubo, S. & Kobayashi, S., Jan 1 2017, In : Fusion Engineering and Design. 114, p. 97-101 5 p.

Research output: Contribution to journalArticle

Polarization
Mirrors
Copper
Electric lines
Wave transmission
2 Citations (Scopus)

Origin and Evolution of Spontaneous Rotation in Plasma under Different Magnetic Field Geometries in Tokamak QUEST

QUEST Team, Apr 2016, In : IEEE Transactions on Plasma Science. 44, 4, p. 441-447 7 p., 7416222.

Research output: Contribution to journalArticle

magnetic field configurations
geometry
magnetic fields
electron cyclotron resonance
plasma currents
12 Citations (Scopus)

Overview of transport and MHD stability study: Focusing on the impact of magnetic field topology in the Large Helical Device

Ida, K., Nagaoka, K., Inagaki, S., Kasahara, H., Evans, T., Yoshinuma, M., Kamiya, K., Ohdach, S., Osakabe, M., Kobayashi, M., Sudo, S., Itoh, K., Akiyama, T., Emoto, M., Dinklage, A., Du, X., Fujii, K., Goto, M., Goto, T., Hasuo, M. & 101 others, Hidalgo, C., Ichiguchi, K., Ishizawa, A., Jakubowski, M., Kawamura, G., Kato, D., Morita, S., Mukai, K., Murakami, I., Murakami, S., Narushima, Y., Nunami, M., Ohno, N., Pablant, N., Sakakibara, S., Seki, T., Shimozuma, T., Shoji, M., Tanaka, K., Tokuzawa, T., Todo, Y., Wang, H., Yokoyama, M., Yamada, H., Takeiri, Y., Mutoh, T., Imagawa, S., Mito, T., Nagayama, Y., Watanabe, K. Y., Ashikawa, N., Chikaraishi, H., Ejiri, A., Furukawa, M., Fujita, T., Hamaguchi, S., Igami, H., Isobe, M., Masuzaki, S., Morisaki, T., Motojima, G., Nagasaki, K., Nakano, H., Oya, Y., Suzuki, C., Suzuki, Y., Sakamoto, R., Sakamoto, M., Sanpei, A., Takahashi, H., Tsuchiya, H., Tokitani, M., Ueda, Y., Yoshimura, Y., Yamamoto, S., Nishimura, K., Sugama, H., Yamamoto, T., Idei, H., Isayama, A., Kitajima, S., Masamune, S., Shinohara, K., Bawankar, P. S., Bernard, E., Von Berkel, M., Funaba, H., Huang, X. L., Ii, T., Ido, T., Ikeda, K., Kamio, S., Kumazawa, R., Kobayashi, T., Moon, C., Muto, S., Miyazawa, J., Ming, T., Nakamura, Y., Nishimura, S., Ogawa, K., Ozaki, T., Oishi, T., Ohno, M., Pandya, S., Shimizu, A., Seki, R., Sano, R., Saito, K., Sakaue, H., Takemura, Y., Tsumori, K., Tamura, N., Tanaka, H., Toi, K., Wieland, B., Yamada, I., Yasuhara, R., Zhang, H., Kaneko, O. & Komori, A., Jul 30 2015, In : Nuclear Fusion. 55, 10, 104018.

Research output: Contribution to journalArticle

ion temperature
topology
electron energy
momentum
impurities
10 Citations (Scopus)

Particle balance in long duration RF driven plasmas on QUEST

Hanada, K., Zushi, H., Yoshida, N., Yugami, N., Honda, T., Hasegawa, M., Mishra, K., Kuzmin, A., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Watanabe, O., Onchi, T., Watanabe, H., Tokunaga, K., Higashijima, A., Kawasaki, S., Nakashima, H., Takase, Y. & 3 others, Fukuyama, A., Mitarai, O. & Peng, Y. K. M., Jul 22 2015, In : Journal of Nuclear Materials. 463, p. 1084-1086 3 p., 48871.

Research output: Contribution to journalArticle

Plasmas
desorption
hydrogen fuels
Thermal desorption
Hydrogen fuels

Particle balance investigation with the combination of the hydrogen barrier model and rate equations of hydrogen state in long duration discharges on an all-metal plasma facing wall in QUEST

Hanada, K., Yoshida, N., Hasegawa, M., Hatayama, A., Okamoto, K., Takagi, I., Hirata, T., Oya, Y., Miyamoto, M., Oya, M., Shikama, T., Kuzmin, A., Wang, Z. X., Long, H., Idei, H., Nagashima, Y., Nakamura, K., Watanabe, O., Onchi, T., Watanabe, H. & 12 others, Tokunaga, K., Higashijima, A., Kawasaki, S., Nagata, T., Shimabukuro, S., Takase, Y., Murakami, S., Gao, X., Liu, H., Qian, J., Raman, R. & Ono, M., May 23 2019, In : Nuclear Fusion. 59, 7, 076007.

Research output: Contribution to journalArticle

fuel gages
Fuel gages
Tokamak devices
tokamak devices
Magnetoplasma

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

Plasma equilibrium based on RF-driven current profile without assuming nested magnetic surfaces on QUEST

Nakamura, K., Alam, M. M., Jiang, Y. Z., Mitarai, O., Kurihara, K., Kawamata, Y., Sueoka, M., Takechi, M., Hasegawa, M., Tokunaga, K., Araki, K., Zushi, H., Hanada, K., Fujisawa, A., Idei, H., Nagashima, Y., Kawasaki, S., Nakashima, H., Higashijima, A., Nagata, T. & 1 others, Fukuyama, A., Nov 2017, In : Fusion Engineering and Design. 123, p. 532-534 3 p.

Research output: Contribution to journalArticle

Plasmas
Orbits
Hamiltonians
MATLAB
Current density
9 Citations (Scopus)

Power Balance Estimation in Long Duration Discharges on QUEST

Hanada, K., Zushi, H., Idei, H., Nakamura, K., Ishiguro, M., Tashima, S., Kalinnikova, E. I., Nagashima, Y., Hasegawa, M., Fujisawa, A., Higashijima, A., Kawasaki, S., Nakashima, H., Mitarai, O., Fukuyama, A., Takase, Y., Gao, X., Liu, H., Qian, J., Ono, M. & 1 others, Raman, R., Nov 2016, In : Plasma Science and Technology. 18, 11, p. 1069-1075 7 p.

Research output: Contribution to journalArticle

water temperature
configurations
vessels
orbits
cooling

Prototype phased-array patch loop antennae for electron cyclotron emission diagnostics

Fukuyama, M., Idei, H., Yunoki, M., Ashida, R., Ogata, D., Ikezoe, R. & Onchi, T., Jan 1 2019, In : Plasma and Fusion Research. 14, 3402111.

Research output: Contribution to journalArticle

Open Access
loop antennas
patch antennas
phased arrays
cyclotrons
prototypes

Quasi-optical polarizer system for ECHCD experiments in the QUEST

Fukuyama, M., Idei, H., Tsujimura, T. I., Kubo, S., Kobayashi, S., Yunoki, M., Onchi, T. & Ikezoe, R., Sep 1 2019, In : Fusion Engineering and Design. 146, p. 1437-1440 4 p.

Research output: Contribution to journalArticle

Cyclotrons
Optical systems
Electric lines
Mirrors
Polarization
1 Citation (Scopus)

Response of the far scrape-off layer plasma to strong gas puffing in the high poloidal beta configuration of the QUEST spherical tokamak

Onchi, T., Zushi, H., Mishra, K., Oyama, Y., Nagashima, Y., Hanada, K., Idei, H., Hasegawa, M., Kuzmin, A., Miura, H., Nakamura, K., Fujisawa, A. & Nagaoka, K., Sep 15 2016, In : Plasma Physics and Controlled Fusion. 58, 11, 115004.

Research output: Contribution to journalArticle

plasma layers
Plasmas
configurations
Gases
gases
6 Citations (Scopus)

Self organization of high βp plasma equilibrium with an inboard poloidal magnetic field null in QUEST

Mishra, K., Zushi, H., Idei, H., Hasegawa, M., Onchi, T., Tashima, S., Banerjee, S., Hanada, H., Togashi, H., Yamaguchi, T., Ejiri, A., Takase, Y., Nakamura, K., Fujisawa, A., Nagashima, Y. & Kuzmin, A., Aug 1 2015, In : Nuclear Fusion. 55, 8, 083009.

Research output: Contribution to journalArticle

plasma equilibrium
magnetic fields
cyclotrons
configurations
pulses
4 Citations (Scopus)

Spatial distribution of atomic and ion hydrogen flux and its effect on hydrogen recycling in long duration confined and non-confined plasmas

Kuzmin, A., Zushi, H., Takagi, I., Sharma, S. K., Kobayashi, M., Hirooka, Y., Onchi, T., Hanada, K., Yoshida, N., Nakamura, K., Fujisawa, A., Idei, H., Nagashima, Y., Hasegawa, M., Mutoh, T., Mishra, K. & Ohwada, H., Aug 2017, In : Nuclear Materials and Energy. 12, p. 627-632 6 p.

Research output: Contribution to journalArticle

hydrogen ions
recycling
Spatial distribution
Protons
Recycling
1 Citation (Scopus)

Spectroscopic measurements of impurity ion toroidal and poloidal flow velocities and their dependence on vertical magnetic field in QUEST toroidal ECR plasmas

Yoneda, N., Shikama, T., Zushi, H., Hanada, K., Fujikawa, A., Onchi, T., Kuroda, K., Nii, K., Hasuo, M., Hasegawa, M., Idei, H., Nakamura, K., Nagashima, Y., Higashijima, A. & Nagata, T., Jan 1 2018, In : Plasma and Fusion Research. 13, 3402087.

Research output: Contribution to journalArticle

Open Access
electron cyclotron resonance
flow velocity
impurities
magnetic fields
ions