Hydrogen removal by electron cyclotron wall conditioning with neon gas and its impact of tokamak plasma start-up on the QUEST spherical tokamak 査読 国際誌

Masakatsu Fukumoto, Qilin Yue, Kazuaki Hanada, Shinichiro Kojima, Tomohide Nakano, NY Yoshida, Ryuya Ikezoe, Yoshihiko Nagashima, Takeshi Ido, Takumi Onchi, Hiroshi Idei, Hiroki Iguchi, Takumi Komiyama, Taiichi Shikama, Akira Ejiri, Suguru Masuzaki, Mizuki Sakamoto, Yoshio Ueda, Kengoh Kuroda, Kaori Kono, Shun Shimabukuro, Aki Higashijima

Nuclear Fusion   64 ( 6 )   066022   2024年5月

Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma Authors 査読 国際誌

Takumi Komiyama, Taiichi Shikama, Kazuaki Hanada, Takeshi Ido, Takumi Onchi, Kaori Kono, Akira Ejiri, Makoto Hasegawa, Satoshi Inoue, Masahiro Hasuo, Hiroshi Idei, Qilin Yue, Kengoh Kuroda, Aki Higashijima, Pakkapawn Prapan

Plasma Physics and Controlled Fusion   66   045018   2024年3月

Demonstration of transient CHI startup using a floating biased electrode configuration 査読 国際誌

Kengoh Kuroda, R Raman, T Onchi, M Hasegawa, K Hanada, M Ono, BA Nelson, J Rogers, R Ikezoe, H Idei, T Ido, M Nagata, O Mitarai, N Nishino, Y Otsuka, Y Zhang, K Kono, S Kawasaki, T Nagata, A Higashijima, S Shimabukuro, I Niiya, I Sekiya, K Nakamura, Y Takase, A Ejiri, S Murakami

Nuclear Fusion   64 ( 1 )   014002   2023年12月

Effects of toroidally-distributed-divertor biasing on scrape-off-layer (SOL) current drive, divertor particle flux and fast electron confinement in the QUEST spherical tokamak 査読 国際誌

Kazuo Toi, Takumi Onchi, Hideki Zushi, Kengoh Kuroda, Hiroshi Idei, Kazuaki Hanada, Makoto Hasegawa, Shinichiro Kojima, Ryuya Ikezoe, Takeshi Ido, Shoji Kawasaki, Aki Higashijima, QUEST Experiment Group

Nuclear Fusion   63 ( 10 )   106018   2023年9月

Sudden Change Events of Plasma Current during Electron-Cyclotron Current Start-Up on the QUEST Spherical Tokamak 査読 国際誌

Ryuya Ikezoe, Kosuke Takeda, Kengoh Kuroda, Takumi Onchi, Takahiro Nagata, Izumi Sekiya, Hiroshi Idei, Fadilla Zennifa, Yifan Zhang, Seiya Sakai, Rikuya Miyata, Takahiro Yamaguchi, Makoto Hasegawa, Yoshihiko Nagashima, Takeshi Ido, Kazuaki Hanada

Plasma and Fusion Research   18   2402066 - 2402066   2023年8月

Spectroscopic measurement of increases in hydrogen molecular rotational temperature with plasma-facing surface temperature and due to collisional-radiative processes in tokamaks 招待 査読 国際誌

N Yoneda, T Shikama, F Scotti, K Hanada, H Iguchi, H Idei, T Onchi, A Ejiri, T Ido, K Kono, Y Peng, Y Osawa, G Yatomi, A Kidani, M Kudo, R Hiraka, K Takeda, RE Bell, A Maan, DP Boyle, R Majeski, VA Soukhanovskii, M Groth, AG McLean, RS Wilcox, C Lasnier, Kazuo Nakamura, Y Nagashima, R Ikezoe, M Hasegawa, Kengoh Kuroda, A Higashijima, T Nagata, S Shimabukuro, I Niiya, I Sekiya, M Hasuo

Nuclear Fusion   2023年7月

A versatile power supply system for the central solenoid of the QUEST spherical tokamak 査読 国際誌

Yifan Zhang, Takumi Onchi, Kazuo Nakamura, Yuya Otsuka, Yuji Koide, Qilin Yue, Takahiro Nagata, Shoji Kawasaki, Kengoh Kuroda, Makoto Hasegawa, Ryuya Ikezoe, Takeshi Ido, Kazuaki Hanada, Hiroshi Idei

Fusion Engineering and Design   191   113648   2023年6月

QUEST Database for Tokamak Big Data 査読 国際誌

Makoto HASEGAWA, Aki HIGASHIJIMA, Ichiro NIIYA, Kazuaki HANADA, Hiroshi IDEI, Takeshi IDO, Ryuya IKEZOE, Takumi ONCHI, Kengo KURODA, Daisuke SAKURAI

Plasma and Fusion Research   18   1305048   2023年6月

Circuit design for doubling the toroidal magnetic field on the QUEST spherical tokamak 招待 査読 国際誌

Takumi Onchi, Hiroshi Idei, Nagato Yanagi, Yifan Zhang, Kazuo Nakamura, Kengoh Kuroda, Makoto Hasegawa, Ryuya Ikezoe, Kazuaki Hanada, Takeshi Ido, Masahiro Kobayashi, Yuichi Ogawa, Minoru Yoshitani, Takemi Kawamura

Circuit design for doubling the toroidal magnetic field on the QUEST spherical tokamak   192   113794   2023年6月

Initial testing of ohmic heating through double flux swing during electron cyclotron start-up in the QUEST spherical tokamak 招待 査読 国際誌

Yifan Zhang, Takumi Onchi, Kazuo Nakamura, Qilin Yue, Takahiro Nagata, Shoji Kawasaki, Kengoh Kuroda, Makoto Hasegawa, Ryuya Ikezoe, Takeshi Ido, Kazuaki Hanada, Hiroshi Idei

PLASMA SCIENCE & TECHNOLOGY   25 ( 5 )   2023年5月

8.56-GHz quasi-optical launcher system with incident-mode selectivity on the QUEST spherical tokamak 招待 査読 国際誌

H Idei, M Sakaguchi, K Mishra, T Onchi, R Ikezoe, O Watanabe, Y Tanaka, T Saito, T Ido, K Hanada

FUSION ENGINEERING AND DESIGN   189   2023年4月

Quaternion Analysis of Transient Phenomena of Motor-Generator 招待 査読 国際誌

Kazuo Nakamura, Yifan Zhang, Takumi Onchi, Hiroshi Idei, Makoto Hasegawa, Kazutoshi Tokunaga, Kazuaki Hanada, Takeshi Ido, Ryuya Ikezoe, Hirotaka Chikaraishi, Osamu Mitarai, Shoji Kawasaki, Aki Higashijima, Takahiro Nagata, Shun Shimabukuro

Plasma and Fusion Research   Volume 18(2023)2405035   2023年4月

Development of Thomson Scattering Measurement System for Long Duration Discharges on the QUEST Spherical Tokamak 招待 査読 国際誌

Kaori Kono, Takeshi Ido, Akira Ejiri, Kazuaki Hanada, Qilin Yue, Makoto Hasegawa, Yi Peng, Seiya Sakai, Ryuya Ikezoe, Hiroshi Idei, Syoji Kawasaki, Kengoh Kuroda, Takumi Onchi, Yoshihiko Nagashima, Seowon Jang

Plasma and Fusion Research   18   1405012-1 - 1405012-4   2023年2月

Improvements to the High-Field-Side Transient CHI System on QUEST 招待 査読 国際誌

Kengoh Kuroda, R Raman, Makoto Hasegawa, T Onchi, Kazuaki Hanada, M Ono, BA Nelson, J Rogers, R Ikezoe, H Idei, T Ido, O Mitarai, M Nagata, S Kawasaki, T Nagata, A Higashijima, S Shimabukuro, I Niiya, I Sekiya, S Kojima, Kazuo Nakamura, Y Takase, S Murakami

JOURNAL OF FUSION ENERGY   41 ( 2 )   2022年12月

Design Considerations for the Implementation of a High-Field-Side Transient CHI System on QUEST 招待 査読 国際誌

Roger Raman, K Kuroda, K Hanada, Masayuki Ono, Makoto Hasegawa, T Onchi, R Ikezoe, H Idei, T Ido, John A Rogers

IEEE TRANSACTIONS ON PLASMA SCIENCE   50 ( 11 )   4171 - 4176   2022年11月

Conceptual design of a heavy ion beam probe for the QUEST spherical tokamak 招待 査読 国際誌

T Ido, M Hasegawa, R Ikezoe, T Onchi, K Hanada, H Idei, K Kuroda, Y Nagashima

REVIEW OF SCIENTIFIC INSTRUMENTS   93 ( 11 )   2022年11月

Adaptive Capon beamforming for lensless electron cyclotron emission imaging with high spatial resolution 招待 査読 国際誌

H Idei, M Fukuyama, S Sakai, K Mishra, K Nishimura, R Ikezoe, T Onchi, T Ido, K Hanada

REVIEW OF SCIENTIFIC INSTRUMENTS   93 ( 10 )   2022年10月

Towards automated gas leak detection through cluster analysis of mass spectrometer data 招待 査読 国際誌

@Makoto Hasegawa, @Daisuke Sakurai, @Aki Higashijima , @Ichiro Niiya, @Keiji Matsushima, @Kazuaki Hanada, @Hiroshi Idei, @Takeshi Ido, @Ryuya Ikezoe, @Takumi Onchi, @Kengo Kuroda

Fusion Engineering and Design   180   1 - 9   2022年6月

Overview of coordinated spherical tokamak research in Japan 招待 査読 国際誌

Takase, Y.; Ejiri, A.; Fujita, T.; Hanada, K.; Idei, H.; Nagata, M.; Onchi, T.; Ono, Y.; Tanaka, H.; Tsujii, N.; Uchida, M.; Yasuda, K.; Kasahara, H.; Murakami, S.; Takeiri, Y.; Todo, Y.; Tsuji-Iio, S.; Kamada, Y.

NUCLEAR FUSION   62 ( 4 )   2022年4月

Quaternion Analysis of Transient Phenomena in Matrix Converter Based on Space-Vector Modulation 招待 査読 国際誌

Kazuo NAKAMURA, Yifan ZHANG1), Takumi ONCHI, Hiroshi IDEI, Makoto HASEGAWA, Kazutoshi TOKUNAGA, Kazuaki HANADA, Hirotaka CHIKARAISHI2), Osamu MITARAI3), Shoji KAWASAKI, Aki HIGASHIJIMA, Takahiro NAGATA and Shun SHIMABUKURO

Plasma and Fusion Research   2022年2月

Observation of second harmonic electron cyclotron resonance heating and current-drive transition during non-inductive plasma start-up experiment in QUEST 招待 査読 国際誌

Kojima, Shinichiro; Hanada, Kazuaki; Idei, Hiroshi; Onchi, Takumi; Ikezoe, Ryuya; Nagashima, Yoshihiko; Hasegawa, Makoto; Kuroda, Kengoh; Nakamura, Kazuo; Higashijima, Aki; Nagata, Takahiro; Kawasaki, Shoji; Shimabukuro, Shun; Elserafy, Hatem; Fukuyama, Masaharu; Ejiri, Akira; Shikama, Taiichi; Yoneda, Nao; Yoneda, Ryota; Kariya, Tsuyoshi; Takase, Yuichi; Murakami, Sadayoshi; Bertelli, Nicola; Ono, Masayuki

PLASMA PHYSICS AND CONTROLLED FUSION   63 ( 10 )   2021年10月

MHD Equilibrium Reconstruction Using the Visible Light Tomographic Method with Laplacian Eigenfunction 査読 国際誌

Kosuke Suzuki, Sadayoshi Murakami, Satoshi Ohdachi, Hiroshi Idei, Kengoh Kuroda, Ryuya Ikezoe, Takumi Onchi

Plasma and Fusion Research   2021年7月

Designing an upgrade of ohmic heating system for the QUEST spherical tokamak 査読 国際誌

#Yifan Zhang, @Takumi Onchi, @Kazuo Nakamura, #Akihiro Kidani, #Qilin Yue, @Kengoh Kuroda, @Makoto Hasegawa, @Ryuya Ikezoe, @Hiroshi Idei

Fusion Engineering and Design   168   112362   2021年7月

Overview of recent progress on steady state operation of all-metal plasma facing wall device QUEST 招待 査読 国際誌

Hanada, K.; Yoshida, N.; Hasegawa, M.; Oya, M.; Oya, Y.; Takagi, I; Hatayama, A.; Shikama, T.; Idei, H.; Nagashima, Y.; Ikezoe, R.; Onchi, T.; Kuroda, K.; Kawasaki, S.; Higashijima, A.; Nagata, T.; Shimabukuro, S.; Nakamura, K.; Murakami, S.; Takase, Y.; Gao, X.; Liu, H.; Qian, J.

NUCLEAR MATERIALS AND ENERGY   27   2021年6月

Investigation of radial distribution of atomic hydrogen flux to the plasma facing components in steady state discharges in QUEST tokamak 査読 国際誌

Kuzmin, A.; Kobayashi, M.; Hanada, K.; Idei, H.; Onchi, T.; Mori, S.; Yoneda, N.; Shikama, T.; Hasuo, M.; Ido, T.; Nagashima, Y.; Ikezoe, R.; Hasegawa, M.; Kuroda, K.; Kono, K.; Matsuo, S.; Nagata, T.; Shimabukuro, S.; Higashijima, A.; Niiya, I; Zushi, H.

NUCLEAR MATERIALS AND ENERGY   26   100872   2021年3月

Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy 査読 国際誌

N Yoneda, T Shikama, K Hanada, S Mori, Takumi Onchi, K Kuroda, M Hasuo, A Ejiri, K Matsuzaki, Y Osawa, Y Peng, Y Kawamata, S Sakamoto, H Idei, T Ido, K Nakamura, Y Nagashima, Ryuya Ikezoe, M Hasegawa, A Higashijima, T Nagata, S Shimabukuro

Nuclear Materials and Energy   26 ( 3 )   100905-1 - 100905-7   2021年3月

Effects of Toroidally Distributed Divertor Biasing on Scrape-Off-Layer Plasma in the QUEST Spherical Tokamak 査読 国際誌

Kazuo TOI, Takumi ONCHI, Kengo KURODA, Shinichiro KOJIMA, Hideki ZUSHI, Makoto HASEGAWA, Masaharu FUKUYAMA, Shoji KAWASAKI, Aki HIGASHIJIMA, Ryuya IKEZOE, Hiroshi IDEI, Takeshi IDO, Kazuaki HANADA, QUEST Experiment Group

Plasma and Fusion Research   16   2021年3月

Extension of Operation Region for Steady State Operation on QUEST by Integrated Control with Hot Walls 招待 査読 国際誌

Makoto HASEGAWA, Kazuaki HANADA, Naoaki YOSHIDA, Hiroshi IDEI, Takeshi IDO, Yoshihiko NAGASHIMA, Ryuya IKEZOE, Takumi ONCHI, Kengoh KURODA, Shoji KAWASAKI, Aki HIGASHIJIMA, Takahiro NAGATA, Shun SHIMABUKURO, Kazuo NAKAMURA

Plasma and Fusion Research   16   2021年3月

Quaternion Analysis of a Direct Matrix Converter Based on Space-Vector Modulation 査読 国際誌

Kazuo Nakamura, Yifan Zhang, Takumi Onchi, Hiroshi Idei, Makoto Hasegawa, Kazutoshi Tokunaga, Kazuaki Hanada, Osamu Mitarai, Shoji Kawasaki, Aki Higashijima, Takahiro Nagata, Shun Shimabukuro

Plasma and Fusion Research   16   2405037 - 2405037   2021年3月

Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST 査読 国際誌

Satoru Mori, Taiichi Shikama, Kazuaki Hanada, Nao Yoneda, Arseniy Kuzmin, Masahiro Hasuo, Hiroshi Idei, Takumi Onchi, Akira Ejiri, Yuki Osawa, Yi Peng, Kyohei Matsuzaki, Shinichiro Kado, Keiji Sawada, Takeshi Ido, Kazuo Nakamura, Ryuya Ikezoe, Yoshihiko Nagashima, Makoto Hasegawa, Kengo Kuroda, Aki Higashijima, Takahiro Nagata, Shun Shimabukuro

Atoms   8 ( 3 )   44-1 - 44-8   2020年9月

Modeling of solenoid-free start-up using 2nd harmonic electron cyclotron heating and current drive in QUEST 査読 国際誌

M Ono, N Bertelli, H Idei, K Hanada, Takumi Onchi, S Kojima, H Elserafy

AIP Conference Proceedings   2254 ( 1 )   090001   2020年9月

Parametric Decay Wave Observation in HFS X-Mode Injection in QUEST 査読 国際誌

Shinichiro Kojima, Hatem Elserafy, Kazuaki Hanada, Hiroshi Idei, Ryuya Ikezoe, Yoshihiko Nagashima, Makoto Hasegawa, Takumi Onchi, Kengoh Kuroda, Kazuo Nakamura, Takahiro Murakami, Masaharu Fukuyama, Ryoya Kato, Ryota Yoneda, Masayuki Ono, Akira Ejiri, Yuichi Takase, Sadayoshi Murakami

Plasma and Fusion Research   15   2402063-1 - 2402063-2   2020年8月

Predictive maintenance and safety operation by device integration on the QUEST large experimental device 査読 国際誌

@Makoto Hasegawa, @Kazuaki Hanada, @Hiroshi Idei, @Shoji Kawasaki, @Takahiro Nagata, @Ryuya Ikezoe, @Takumi Onchi, @Kengoh Kuroda, @Aki Higashijima

Heliyon   6 ( 6 )   e04214   2020年6月

Measurement of Dynamic Retention with Fast Ejecting System of Targeted Sample (FESTA) 招待 査読 国際誌

#Qilin YUE, @Kazuaki HANADA, @Makoto OYA, Shogo MATSUO, #Shinichiro KOJIMA, @Hiroshi IDEI, @Takumi ONCHI, @Kengoh KURODA, @Naoaki YOSHIDA, @Ryuya IKEZOE, Yukai LIU, @Makoto HASEGAWA, @Shun SHIMABUKURO, @Aki HIGASHIJIMA, @Takahiro NAGATA and @Shoji KAWASAKI

Plasma and Fusion Research   15 ( 2402013 )   2402013-1 - 2402013-5   2020年4月

Electron heating of over-dense plasma with dual-frequency electron cyclotron waves in fully non-inductive plasma ramp-up on the QUEST spherical tokamak 査読

H. Idei, T. Onchi, K. Mishra, H. Zushi, T. Kariya, T. Imai, O. Watanabe, R. Ikezoe, K. Hanada, M. Ono, A. Ejiri, J. Qian, K. Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Fukuyama, S. Kubo, M. Yoshikawa, M. Sakamoto, S. Kawasaki, A. Higashijima, S. Ide, Y. Takase, S. Murakami

Nuclear Fusion   60 ( 1 )   2020年1月

Electron Bernstein wave conversion of high-field side injected X-modes in QUEST 査読

Hatem Elserafy, Kazuaki Hanada, Shinichiro Kojima, Takumi Onchi, Ryuya Ikezoe, Kengoh Kuroda, Hiroshi Idei, Makoto Hasegawa, Ryota Yoneda, Masaharu Fukuyama, Arseniy Kuzmin, Aki Higashijima, Takahiro Nagata, Shoji Kawasaki, Shun Shimabukuro, Nicola Bertelli, Masayuki Ono

Plasma Physics and Controlled Fusion   62 ( 3 )   2020年1月

Quasi-optical polarizer system for ECHCD experiments in the QUEST 査読

M. Fukuyama, Hiroshi Idei, T. I. Tsujimura, S. Kubo, S. Kobayashi, M. Yunoki, Takumi Onchi, Ryuya Ikezoe

Fusion Engineering and Design   146   1437 - 1440   2019年9月

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

K. Nakamura, M. M. Alam, Y. Z. Jiang, O. Mitarai, M. Takechi, M. Hasegawa, K. Tokunaga, K. Hanada, H. Idei, Y. Nagashima, T. Onchi, K. Kuroda, O. Watanabe, A. Higashijima, T. Nagata, S. Shimabukuro, S. Kawasaki, A. Fukuyama

Fusion Engineering and Design   146   2628 - 2631   2019年9月

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

Takumi Onchi, Hiroshi Idei, K. Nakamura, T. Nagata, S. Kawasaki, R. Ashida, M. Fukuyama, Makoto Hasegawa, Ryuya Ikezoe, A. Higashijima, K. Kuroda, Yoshihiko Nagashima, Kazuaki Hanada

Fusion Engineering and Design   146   2567 - 2570   2019年9月

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 査読

K. Hanada, N. Yoshida, M. Hasegawa, A. Hatayama, K. Okamoto, I. Takagi, T. Hirata, Y. Oya, M. Miyamoto, M. Oya, T. Shikama, A. Kuzmin, Z. X. Wang, H. Long, H. Idei, Y. Nagashima, K. Nakamura, O. Watanabe, T. Onchi, H. Watanabe, K. Tokunaga, A. Higashijima, S. Kawasaki, T. Nagata, S. Shimabukuro, Y. Takase, S. Murakami, X. Gao, H. Liu, J. Qian, R. Raman, M. Ono

Nuclear Fusion   59 ( 7 )   2019年5月

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

Kazuaki Hanada, N. Yoshida, I. Takagi, T. Hirata, A. Hatayama, K. Okamoto, Y. Oya, T. Shikama, Z. Wang, H. Long, C. Huang, M. Oya, Hiroshi Idei, Yoshihiko Nagashima, Takumi Onchi, Makoto Hasegawa, K. Nakamura, H. Zushi, K. Kuroda, S. Kawasaki, A. Higashijima, T. Nagata, S. Shimabukuro, Y. Takase, S. Murakami, X. Gao, H. Liu, J. Qian, R. Raman, M. Ono

Nuclear Materials and Energy   19   544 - 549   2019年5月

Development of high power gyrotrons for advanced fusion devices 査読

T. Kariya, R. Minami, T. Imai, M. Okada, F. Motoyoshi, T. Numakura, Y. Nakashima, Hiroshi Idei, Takumi Onchi, Kazuaki Hanada, T. Shimozuma, Y. Yoshimura, H. Takahashi, S. Kubo, Y. Oda, R. Ikeda, K. Sakamoto, M. Ono, K. Nagasaki, T. Eguchi, Y. Mitsunaka

Nuclear Fusion   59 ( 6 )   2019年4月

Improvement of aperture configuration to reduce the stray light for Thomson scattering measurement using a peripheral beam profile monitor 査読

Yuya Kawamata, Akira Ejiri, Kyohei Matsuzaki, Yuichi Takase, Naoto Tsujii, Takumi Onchi, Yoshihiko Nagashima

Plasma and Fusion Research   14   2019年1月

HFS injection of X-mode for EBW conversion in QUEST 査読

Hatem Elserafy, Kazuaki Hanada, Kengoh Kuroda, Hiroshi Idei, Ryota Yoneda, Canbin Huang, Shinichiro Kojima, Makoto Hasegawa, Yoshihiko Nagashima, Takumi Onchi, Ryuya Ikezoe, Aki Higashijima, Takahiro Nagata, Shoji Kawasaki, Shun Shimabukuro, Nicola Bertelli, Masayuki Ono

Plasma and Fusion Research   14 ( 1 )   2019年1月

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

Hiroshi Idei, Takumi Onchi, T. Kariya, T. I. Tsujimura, S. Kubo, S. Kobayashi, M. Sakaguchi, T. Imai, Makoto Hasegawa, K. Nakamura, K. Mishra, M. Fukuyama, M. Yunoki, S. Kojima, O. Watanabe, K. Kuroda, Kazuaki Hanada, Yoshihiko Nagashima, A. Ejiri, N. Matsumoto, M. Ono, A. Higashijima, T. Nagata, S. Shimabukoro, Y. Takase, A. Fukuyama, S. Murakami

Fusion Engineering and Design   2019年1月

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

Masaharu Fukuyama, Hiroshi Idei, Miu Yunoki, Ryuichi Ashida, Daichi Ogata, Ryuya Ikezoe, Takumi Onchi

Plasma and Fusion Research   14   2019年1月

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

K. Kuroda, R. Raman, Kazuaki Hanada, Makoto Hasegawa, Takumi Onchi, M. Ono, B. A. Nelson, T. R. Jarboe, M. Nagata, O. Mitarai, K. Nakamura, Hiroshi Idei, J. Rogers, S. Kawasaki, T. Nagata, A. Kuzmin, S. Kojima, C. Huang, O. Watanabe, A. Higashijima, Y. Takase, A. Fukuyama, S. Murakami

Plasma Physics and Controlled Fusion   60 ( 11 )   2018年9月

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

Santanu Banerjee, H. Zushi, N. Nishino, Kazuaki Hanada, Hiroshi Idei, K. Nakamura, Makoto Hasegawa, akihide fujisawa, Yoshihiko Nagashima, K. Mishra, S. Tashima, Takumi Onchi, A. Kuzmin, K. Matsuoka

Plasma Physics and Controlled Fusion   60 ( 8 )   2018年6月

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

Makoto Hasegawa, Kazuo Nakamura, Kazuaki Hanada, Shoji Kawasaki, Arseniy Kuzmin, Hiroshi Idei, Kazutoshi Tokunaga, Yoshihiko Nagashima, Takumi Onchi, Kengoh Kuroda, Osamu Watanabe, Aki Higashijima, Takahiro Nagata

Fusion Engineering and Design   129   202 - 206   2018年4月

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

Nao Yoneda, Taiichi Shikama, Hideki Zushi, Kazuaki Hanada, Akinobu Fujikawa, Takumi Onchi, Kengoh Kuroda, Kuniaki Nii, Masahiro Hasuo, Makoto Hasegawa, Hiroshi Idei, Kazuo Nakamura, Yoshihiko Nagashima, Aki Higashijima, Takahiro Nagata

Plasma and Fusion Research   13   2018年1月

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

Hiroshi Idei, T. Kariya, T. Imai, K. Mishra, Takumi Onchi, O. Watanabe, H. Zushi, Kazuaki Hanada, J. Qian, A. Ejiri, M. M. Alam, K. Nakamura, akihide fujisawa, Yoshihiko Nagashima, Makoto Hasegawa, K. Matsuoka, A. Fukuyama, S. Kubo, T. Shimozuma, M. Yoshikawa, M. Sakamoto, S. Kawasaki, H. Nakashima, A. Higashijima, S. Ide, T. Maekawa, Y. Takase, K. Toi

Nuclear Fusion   57 ( 12 )   2017年10月

Momentum injection and repetitive CT operation experiments 査読

C. Xiao, A. Rohollahi, Takumi Onchi, M. Dreval, S. Elgriw, A. Hirose

Radiation Effects and Defects in Solids   172 ( 9-10 )   713 - 717   2017年10月

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

Kazuaki Hanada, N. Yoshida, T. Honda, Z. Wang, A. Kuzmin, I. Takagi, T. Hirata, Y. Oya, M. Miyamoto, H. Zushi, Makoto Hasegawa, K. Nakamura, akihide fujisawa, Hiroshi Idei, Yoshihiko Nagashima, O. Watanabe, Takumi Onchi, K. Kuroda, H. Long, Hideo Watanabe, Kazutoshi Tokunaga, A. Higashijima, S. Kawasaki, T. Nagata, Y. Takase, A. Fukuyama, O. Mitarai

Nuclear Fusion   57 ( 12 )   2017年10月

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

A. Kuzmin, H. Zushi, I. Takagi, S. K. Sharma, M. Kobayashi, Y. Hirooka, Takumi Onchi, Kazuaki Hanada, N. Yoshida, K. Nakamura, akihide fujisawa, Hiroshi Idei, Yoshihiko Nagashima, Makoto Hasegawa, T. Mutoh, K. Mishra, H. Ohwada

Nuclear Materials and Energy   12   627 - 632   2017年8月

Comparative studies of inner and outer divertor discharges and a fueling study in QUEST 招待 査読 国際誌

O. Mitarai, K. Nakamura, M. Hasegawa, T. Onchi, H. Idei, A. Fujisawa, K. Hanada, H. Zushi, A. Higashijima, H. Nakashima, S. Kawasaki, K. Matsuoka, S. Koike, T. Takahashi, H. Tsutsui

FUSION ENGINEERING AND DESIGN   109   1365 - 1370   2016年11月

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

T. Onchi, H. Zushi, K. Mishra, Y. Oyama, Y. Nagashima, K. Hanada, H. Idei, M. Hasegawa, A. Kuzmin, H. Miura, K. Nakamura, A. Fujisawa, K. Nagaoka

PLASMA PHYSICS AND CONTROLLED FUSION   58 ( 11 )   2016年11月

Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high beta(p) plasma in QUEST 招待 査読 国際誌

S. Banerjee, H. Zushi, N. Nishino, K. Mishra, K. Mahira, S. Tashima, A. Ejiri, T. Yamaguchi, T. Onchi, Y. Nagashima, K. Hanada, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa, A. Kuzmin, K. Matsuoka

PHYSICS OF PLASMAS   23 ( 8 )   2016年8月

Hydrogen flux measurements with permeation probes in spherical tokamak QUEST 査読 国際誌

A Kuzmin, H Zushi, I Takagi, SK Sharma, Y Hirooka, M Kobayashi, M Sakamoto, K Hanada, T Onchi, Y Oyama, N Youshida, K Nakamura, A Fujisawa, H Idei, Y Nagashima, M Hasegawa, K Mishra

Vacuum   129   2016年4月

Adaptive-array Electron Cyclotron Emission diagnostics using data streaming in a Software Defined Radio system 査読 国際誌

H Idei, K Mishra, MK Yamamoto, M Hamasaki, A Fujisawa, Y Nagashima, Y Hayashi, T Onchi, K Hanada, H Zushi

Journal of Instrumentation   11 ( 4 )   2016年4月

Tomography as a promising diagnostic tool for plasma turbulence 査読 国際誌

A Fujisawa, Y Nagashima, S Inagaki, T Onchi, S Ohshima, A Shimizu

Plasma Physics and Controlled Fusion   58 ( 2 )   2016年2月

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

H Idei, K Mishra, MK Yamamoto, A Fujisawa, Y Nagashima, M Hamasaki, Y Hayashi, T Onchi, K Hanada, H Zushi

Journal of Instrumentation   11 ( 1 )   2016年1月

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

O Mitarai, K Nakamura, M Hasegawa, T Onchi, H Idei, A Fujisawa, K Hanada, H Zushi, A Higashijima, H Nakashima, S Kawasaki, K Matsuoka, S Koike, T Takahashi, H Tsutsui

Fusion Engineering and Design   2015年12月

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

A. Kuzmin, H. Zushi, I. Takagi, S.K. Sharma, A. Rusinov, Y. Inoue, Y. Hirooka, H. Zhou, M. Kobayashi, M. Sakamoto, K. Hanada, N. Yoshida, K. Nakamura, A. Fujisawa, K. Matsuoka, H. Idei, Y. Nagashima, M. Hasegawa, T. Onchi, S. Banerjee, K. Mishra

Journal of Nuclear Materials   463   2015年8月

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

T. Onchi, H. Zushi, K. Mishra, Y. Mahira, K. Nagaoka, K. Hanada, H. Idei, M. Hasegawa, K. Nakamura, A. Fujisawa, Y. Nagashima, K. Matsuoka, S. Tashima, S. Banerjee, A. Kuzmin, S. Kawasaki, H. Nakashima, A. Higashijima, O. Watanabe

Physics of Plasmas   22 ( 8 )   2015年8月

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

55 ( 8 )   2015年8月

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

T. Onchi, Y. Mahira, K. Nagaoka, S. Tashima, S. Banerjee, K. Mishra, H. Idei, K. Hanada, K. Nakamura, A. Fujisawa, Y. Nagashima, M. Hasegawa, K. Matsuoka, A. Kuzmin, O. Watanabe, S. Kawasaki, H. Nakashima, A. Higashijima

Journal of Nuclear Materials   463   2015年8月

Particle balance in long duration RF driven plasmas on QUEST 査読

K. Hanada, H. Zushi, N. Yoshida, N. Yugami, T. Honda, M. Hasegawa, K. Mishra, A. Kuzmin, K. Nakamura, A. Fujisawa, H. Idei, Y. Nagashima, O. Watanabe, T. Onchi, H. Watanabe, K. Tokunaga, A. Higashijima, S. Kawasaki, H. Nakashima, Y. Takase, A. Fukuyama, O. Mitarai, Y.K.M. Peng

Journal of Nuclear Materials   463   2015年8月

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

S. Banerjee, H. Zushi, N. Nishino, K. Mishra, T. Onchi, A. Kuzmin, Y. Nagashima, K. Hanada, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa

Review of Scientific Instruments   86 ( 3 )   2015年3月

Thermal imaging of plasma with a phased array antenna in QUEST 査読 国際誌

K. Mishra, H. Idei, H. Zushi, K. Nagata, R. Akimoto, M. K. Yamamoto, K. Hanada, M. Hasegawa, K. Nakamura, A. Fujisawa, Y. Nagashima, S. Banerjee, T. Onchi, A. Kuzmin

Review of Scientific Instruments   85 ( 11 )   2014年11月

Design and implementation of fast charging circuit for repetitive compact torus injector 査読 国際誌

T. Onchi, D. McColl, M. Dreval, S. Wolfe, C. Xiao, A. Hirose

Fusion Engineering and Design   89 ( 11 )   2014年11月

A prototype diagnostics system to detect ultraviolet emission for plasma turbulence 査読 国際誌

T. Onchi, A. Fujisawa, A. Sanpei

Review of Scientific Instruments   85 ( 11 )   2014年11月

Plasma current sustainment after iron core saturation in the STOR-M tokamak 査読 国際誌

O. Mitarai, Y. Ding, M. Hubeny, Y. Lu, T. Onchi, D. McColl, C. Xiao, A. Hirose

Fusion Engineering and Design   89 ( 9-10 )   2014年10月

Plasma confinement modification and convective transport suppression in the scrape-off layer using additional gas puffing in the STOR-M tokamak 査読 国際誌

M. Dreval, M. Hubeny, Y. Ding, T. Onchi, Y. Liu, K. Hthu, S. Elgriw, C. Xiao, A. Hirose

Plasma Physics and Controlled Fusion   55 ( 3 )   2013年3月

Asymmetric toroidal flux generation due to phase locking of internally resonant tearing modes in the RELAX reversed-field pinch 査読 国際誌

R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose

Plasma Physics and Controlled Fusion   55 ( 1 )   2013年1月

Phase Locking and Unlocking Associated with Transition to Quasi-Single Helicity State in the RELAX Reversed-Field Pinch 査読 国際誌

R. Ikezoe, S. Masamune, K. Oki, A. Sanpei, H. Himura, T. Onchi, A. Hirose

Journal of the Physical Society of Japan   81 ( 11 )   2012年10月

Modification of toroidal flow in the STOR-M tokamak 国際誌

C. Xiao, S. Elgriw, Y. Liu, T. Onchi, M. Dreval, M. Hubeny, Y. Ding, T. Asai, A. Hirose

Proc. 24th Int. Conf. on Fusion Energy (San Diego, CA, 2012)   2012年10月

Design and Initial Result of Time-Resolved Vertical Soft X-Ray Imaging System in Low-A RFP 査読 国際誌

A. Sanpei, K. Oki, D. Fukahori, K. Deguchi, S. Nakaki, K. Nishimura, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi

Plasma and Fusion Research   7   2012年6月

Fuelling Effect of Tangential Compact toroid injection in STOR-M Tokamak 査読 国際誌

T. Onchi, Y. Liu, M. Dreval, D. McColl, T. Asai, S. Wolfe, C. Xiao and A. Hirose

CNS(Canadian Nuclear Society)2012 conference paper   2012年6月

Recent Experiments on the STOR-M Tokamak 査読 国際誌

C. Xiao, T.Onchi, Y. Liu, S. Elgriw, M.Dreval, D. McColl, T. Asai, and A. Hirose

CNS(Canadian Nuclear Society)2012 conference paper   2012年6月

Tangential Image of Helical SXR Emissivity Structure in Low-Aspect-Ratio RFP 査読 国際誌

A. Sanpei, K. Oki, M. Nakamura, A. Higashi, H. Motoi, D. Fukahori, H. Himura, S. Masamune, S. Ohdachi, N. Nishino, T. Onchi, R. Ikezoe

Plasma Science, IEEE Transactions on   39 ( 11 )   2011年11月

Observation of Helical Structure by Imaging Diagnostics in a Low-Aspect-Ratio Reversed Field Pinch 査読 国際誌

T. Onchi, R. Ikezoe, K. Oki, A. Sanpei, H. Himura, S. Masamune, N. Nishino, H. Koguchi

Journal of the Physical Society of Japan   80 ( 11 )   2011年10月

Initial Result of Successive SXR Imaging Measurement in Low-A RFP 査読 国際誌

A. SANPEI, K. OKI, M. NAKAMURA, A. HIGASHI, H. MOTOI, D. FUKAHORI, H. HIMURA, S. MASAMUNE, S. OHDACHI, N. NISHINO, T. ONCHI, R. IKEZOE

Plasma and Fusion Research   6   2011年7月

Extended operational regimes and MHD behavior in a low-aspect-ratio reversed field pinch in RELAX 査読 国際誌

R. Ikezoe, K. Oki, T. Onchi, Y. Konishi, M. Sugihara, S. Fujita, A. Sanpei, H. Himura, S. Masamune

Plasma Physics and Controlled Fusion   53 ( 2 )   2011年2月

Density Regimes of Low-Aspect-Ratio RFP Plasmas in RELAX 査読 国際誌

M. Sugihara, K. Oki, R. Ikezoe, T. Onchi, A. Sanpei, H. Himura, S. Masamune, T. Akiyama, A. Ejiri, K. Sakamoto, K. Nagasaki, V. Zhuravlev

Plasma and Fusion Research   5   2010年12月

Recent Progress in Low-A RFP Plasma Research in RELAX 査読 国際誌

A. Sanpei, R. Ikezoe, T. Onchi, K. Oki, M. Sugihara, Y. Konishi, S. Fujita, M. Nakamura, A. Higashi, H. Motoi, H. Himura, S. Masamune

Plasma and Fusion Research   5   2010年12月

MHD Properties of Low-aspect Ratio RFP in RELAX 査読 国際誌

S Masamune, A Sanpei, R Ikezoe, T Onchi, K Oki, T Yamashita, H Shimazu, H Himura, R Paccagnella

Journal of fusion energy   28 ( 2 )   2009年2月

Equilibrium Reconstruction and Estimation of Neoclassical Effect in Low-Aspect-Ratio Reversed Field Pinch Experiments on RELAX 査読 国際誌

Akio Sanpei, Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Ken-Ichi Murata, Hiroyuki Shimazu, Tetsuo Yamashita, Shinichi Fujita, Haruhiko Himura, Sadao Masamune, Jay K Anderson

Journal of the Physical Society of Japan   78 ( 1 )   2009年1月

Effects of Loowering the Aspect Ratio on MHD Behaviour in a Reversed Field Pinch 国際誌

S. Masamune, A. Sanpei, R. Ikezoe, T. Onchi, K. Oki, T. Yamashita, H. Shimazu, K. Murata, H. Himura, N. Nishino, R. Paccagnella

Proc. 22th Int. Conf. on Fusion Energy (Geneva, 2008)   2008年10月

Observation of large-scale profile change of magnetic field in a low-aspect ratio reversed field pinch 査読 国際誌

Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Akio Sanpei, Haruhiko Himura, Sadao Masamune, Roberto Paccagnella

Journal of the Physical Society of Japan   77 ( 7 )   2008年7月

Quasi-periodic growth of a single helical instability in a low-aspect ratio RFP 査読 国際誌

Ryuya Ikezoe, Takumi Onchi, Kensuke Oki, Akio Sanpei, Haruhiko Himura, Sadao Masamune

Plasma and Fusion Research   3   2008年5月

Observation of Simple Helical Structure in Low Aspect Ratio RFP Using Fast Camera 査読 国際誌

Takumi Onchi, Nobuhiro Nishino, Ryuya Ikezoe, Akio Sanpei, Haruhiko Himura, Sadao Masamune

Plasma and Fusion Research   3   2008年1月

Application of Soft X-Ray Imaging System to the STE-2 RFP 査読 国際誌

Takumi Onchi, Akio Sanpei, Ryuya Ikezoe, Haruhiko Himura, Sadao Masamune

Plasma and Fusion Research   2   2007年11月

Characterization of Initial Low-Aspect Ratio RFP Plasmas in “RELAX” 査読 国際誌

76 ( 12 )   2007年11月

Design of Soft-X Ray Imaging System for Magnetic Islands of RFP Plasmas 査読 国際誌

Akio Sanpei, Takumi Onchi, Ryuya Ikezoe, Haruhiko Himura, Sadao Masamune

Plasma and Fusion Research   2   2007年11月

Research plans for low-aspect ratio reversed field pinch 査読 国際誌

S Masamune, A Sanpei, H Himura, R Ikezoe, T Onchi, M Nagata, H Hiramatsu, D Ishijima

Fusion science and technology   51 ( 2 )   1900年

Characterization of equilibria in a low-aspect-ratio RFP 査読 国際誌

Akio Sanpei, Kensuke Oki, Ryuya Ikezoe, Takumi Onchi, Hiroyuki Shimazu, Tetsuo Yamashita, Haruhiko Himura, Sadao Masamune

Journal of Plasma Fusion Research SERIES   8   1900年

Non-inductive current built-up by local electron cyclotron heating and current drive with a 28 GHz focused beam on QUEST 国際会議

Takumi Onchi, Hiroshi Idei, Makoto Hasegawa, Hiroaki Ohwada, Hideki Zushi, Kazuaki Hanada, Tsuyoshi Kariya, Kishore Mishra, Taichi Shikama, Quest Team

58th Annual Meeting of the APS Division of Plasma Physics  2016年11月 

Present status of current-drive system in QUEST spherical tokamak 招待 国際会議

T. Onchi, H. Idei, K. Nakamura, M. Hasegawa, K. Yamasaki, O. Watanabe, K. Mishra, K. Kuroda, A. Kuzmin, H. Ohwada, A. Ejiri, H. Togashi, N. Matsumoto and K. Hanada

AAPPS-DPP 2017  2017年9月 

学術論文等の審査

役割：査読

2019年

GAMMA10/PDXダイバータ上流領域におけるドップラー分光を用いた磁力線方向フロー計測

2016年4月 - 2018年3月

共同研究

定常化球状トカマク開磁気面領域における能動的放射損失が誘起する熱流変動

研究課題/領域番号：15K17800  2015年 - 2016年

科学研究費助成事業  若手研究(B)

軟X線計測による低アスペクト比RFPプラズマの内部磁場構造測定

研究課題/領域番号：08J10258  2008年 - 2009年

日本学術振興会  科学研究費助成事業  特別研究員奨励費