1
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Idei H, Sakaguchi M, Mishra K, Onchi T, Ikezoe R, Watanabe O, Tanaka Y, Saito T, Ido T, Hanada K. 8.56-GHz quasi-optical launcher system with incident-mode selectivity on the QUEST spherical tokamak. Fusion Engineering and Design 2023. [DOI: 10.1016/j.fusengdes.2023.113479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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2
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Ido T, Hasegawa M, Ikezoe R, Onchi T, Hanada K, Idei H, Kuroda K, Nagashima Y. Conceptual design of a heavy ion beam probe for the QUEST spherical tokamak. Rev Sci Instrum 2022; 93:113516. [PMID: 36461548 DOI: 10.1063/5.0101770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/11/2022] [Indexed: 06/17/2023]
Abstract
A heavy ion beam probe (HIBP) has been designed for the QUEST spherical tokamak to measure plasma turbulence and the profiles of electric potential profiles. Using a cesium ion beam with an energy of several 10 keV, the observable region covers most of the upper half of the plasma. Although the probe beam is deflected by the poloidal magnetic field produced by plasma current and poloidal coil currents, it can be detected under plasma current up to 150 kA by modifying the trajectories with two electrostatic sweepers. According to the numerical estimation of the intensity of the detected beam, sufficient signal intensity for measuring plasma turbulence can be obtained over almost the measurable area when the electron density is up to 1 × 1019 m-3, which is larger than the cut-off density of electron cyclotron heating in QUEST. The performance of the designed HIBP is sufficient to explore the mechanisms of heat and particle transport in magnetically confined plasmas, including the influence of plasma wall interactions, which is a goal of the QUEST project.
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Affiliation(s)
- T Ido
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - M Hasegawa
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - R Ikezoe
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - T Onchi
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - K Hanada
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - H Idei
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - K Kuroda
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - Y Nagashima
- RIAM, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
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3
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Tokuzawa T, Nasu T, Inagaki S, Moon C, Ido T, Idei H, Ejiri A, Imazawa R, Yoshida M, Oyama N, Tanaka K, Ida K. 3D metal powder additive manufacturing phased array antenna for multichannel Doppler reflectometer. Rev Sci Instrum 2022; 93:113535. [PMID: 36461436 DOI: 10.1063/5.0101723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 09/07/2022] [Indexed: 06/17/2023]
Abstract
Measuring the time variation of the wavenumber spectrum of turbulence is important for understanding the characteristics of high-temperature plasmas, and the application of a Doppler reflectometer with simultaneous multi-frequency sources is expected. To implement this diagnostic in future fusion devices, the use of a phased array antenna (PAA) that can scan microwave beams without moving antennas is recommended. Since the frequency-scanning waveguide leaky-wave antenna-type PAA has a complex structure, we have investigated its characteristics by modeling it with 3D metal powder additive manufacturing (AM). First, a single waveguide is fabricated to understand the characteristics of 3D AM techniques, and it is clear that there are differences in performance depending on the direction of manufacture and surface treatment. Then, a PAA is made, and it is confirmed that the beam can be emitted in any direction by frequency scanning. The plasma flow velocity can be measured by applying the 3D manufacturing PAA to plasma measurement.
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Affiliation(s)
- T Tokuzawa
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - T Nasu
- The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
| | - S Inagaki
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji 611-0011, Japan
| | - C Moon
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - T Ido
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - H Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - A Ejiri
- Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
| | - R Imazawa
- National Institutes for Quantum Science and Technology, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
| | - M Yoshida
- National Institutes for Quantum Science and Technology, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
| | - N Oyama
- National Institutes for Quantum Science and Technology, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
| | - K Tanaka
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - K Ida
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
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4
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Idei H, Fukuyama M, Sakai S, Mishra K, Nishimura K, Ikezoe R, Onchi T, Ido T, Hanada K. Adaptive Capon beamforming for lensless electron cyclotron emission imaging with high spatial resolution. Rev Sci Instrum 2022; 93:103531. [PMID: 36319327 DOI: 10.1063/5.0101632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Electron cyclotron emission (ECE) imaging diagnostics incorporating a lensless approach have been developed for measurements involving active spatial selectivity and direction-of-arrival estimation. The Capon method for adaptive-array analysis was proposed to improve the spatial resolution of the two-dimensional ECE imaging technique. Broadband noise source emissions were used to simulate the ECE to verify the practical effectiveness of the Capon method in the ECE imaging. Multiple noise source emission positions were properly estimated with a high spatial resolution using the Capon method.
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Affiliation(s)
- H Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8560, Japan
| | - M Fukuyama
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
| | - S Sakai
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
| | - K Mishra
- Institute for Plasma Research, Gandhinagar 382428, India
| | - K Nishimura
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011, Japan
| | - R Ikezoe
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8560, Japan
| | - T Onchi
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8560, Japan
| | - T Ido
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8560, Japan
| | - K Hanada
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8560, Japan
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5
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Ono M, Bertelli N, Shevchenko V, Idei H, Hanada K. Efficient electron cyclotron current drive regime for plasma current start-up in fusion reactors. Phys Rev E 2022; 106:L023201. [PMID: 36110000 DOI: 10.1103/physreve.106.l023201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 06/01/2022] [Indexed: 06/15/2023]
Abstract
An accessibility enhanced efficient fundamental X-mode electron cyclotron heating (ECH) current start-up regime was identified for a reactorlike toroidal magnetic field range which has more than 100 times higher current drive efficiency compared to more conventional ECH methods for the relevant start-up temperature range. Very high current drive efficiency is possible due to the strong cyclotron interaction only with unidirectional passing electrons constrained by the wave accessibility conditions. This efficient electron cyclotron current drive regime may help facilitate the design of innovative economical solenoid-free tokamak fusion reactor systems.
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Affiliation(s)
- M Ono
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - N Bertelli
- Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
| | - V Shevchenko
- Tokakam Energy, 173 Brook Drive, Milton Park, Oxon, OX14 4SD, United Kingdom
| | - H Idei
- RIAM Kyushu University, Kasuga 816-8580, Japan
| | - K Hanada
- RIAM Kyushu University, Kasuga 816-8580, Japan
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6
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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. Overview of recent progress on steady state operation of all-metal plasma facing wall device QUEST. Nuclear Materials and Energy 2021. [DOI: 10.1016/j.nme.2021.101013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Yoneda N, Shikama T, Hanada K, Mori S, Onchi T, Kuroda K, Hasuo M, Ejiri A, Matsuzaki K, Osawa Y, Peng Y, Kawamata Y, Sakamoto S, Idei H, Ido T, Nakamura K, Nagashima Y, Ikezoe R, Hasegawa M, Higashijima A, Nagata T, Shimabukuro S. Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy. Nuclear Materials and Energy 2021. [DOI: 10.1016/j.nme.2021.100905] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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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. Investigation of radial distribution of atomic hydrogen flux to the plasma facing components in steady state discharges in QUEST tokamak. Nuclear Materials and Energy 2021. [DOI: 10.1016/j.nme.2020.100872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Idei H, Onchi T, Kariya T, Tsujimura T, 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, Ono M, Higashijima A, Nagata T, Shimabukoro S, Takase Y, Fukuyama A, Murakami S. 28-GHz ECHCD system with beam focusing launcher on the QUEST spherical tokamak. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2019.02.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Nakamura K, Alam M, Jiang Y, 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. Plasma equilibrium based on EC-driven current profile with toroidal rotation on QUEST. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2019.04.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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11
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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. High voltage electrical system of 8.56 GHz CW klystron for electron cyclotron heating on QUEST spherical tokamak. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2019.04.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Fukuyama M, Idei H, Tsujimura T, Kubo S, Kobayashi S, Yunoki M, Onchi T, Ikezoe R. Quasi-optical polarizer system for ECHCD experiments in the QUEST. Fusion Engineering and Design 2019. [DOI: 10.1016/j.fusengdes.2019.02.099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Nakamura K, Alam M, Jiang Y, 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, Fukuyama A. Plasma equilibrium based on RF-driven current profile without assuming nested magnetic surfaces on QUEST. Fusion Engineering and Design 2017. [DOI: 10.1016/j.fusengdes.2017.05.070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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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, Fukuyama A, Takase Y, Matsumoto K. Measurement of thickness of film deposited on the plasma-facing wall in the QUEST tokamak by colorimetry. Rev Sci Instrum 2017; 88:093502. [PMID: 28964174 DOI: 10.1063/1.5000739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 08/17/2017] [Indexed: 06/07/2023]
Abstract
After several experimental campaigns in the Kyushu University Experiment with Steady-state Spherical Tokamak (QUEST), the originally stainless steel plasma-facing wall (PFW) becomes completely covered with a deposited film composed of mixture materials, such as iron, chromium, carbon, and tungsten. In this work, an innovative colorimetry-based method was developed to measure the thickness of the deposited film on the actual QUEST wall. Because the optical constants of the deposited film on the PFW were position-dependent and the extinction coefficient k1 was about 1.0-2.0, which made the probing light not penetrate through some thick deposited films, the colorimetry method developed can only provide a rough value range of thickness of the metal-containing film deposited on the actual PFW in QUEST. However, the use of colorimetry is of great benefit to large-area inspections and to radioactive materials in future fusion devices that will be strictly prohibited from being taken out of the limited area.
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Affiliation(s)
- Z Wang
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - K Hanada
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - N Yoshida
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - T Shimoji
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - M Miyamoto
- Department of Material Science, Shimane University, Matsue, Shimane 690-8504, Japan
| | - Y Oya
- Faculty of Science, Shizuoka University, Ohya, Shizuoaka 422-8529, Japan
| | - H Zushi
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - H Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - K Nakamura
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - A Fujisawa
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - Y Nagashima
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - M Hasegawa
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - S Kawasaki
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - A Higashijima
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - H Nakashima
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - T Nagata
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - A Kawaguchi
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - T Fujiwara
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - K Araki
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - O Mitarai
- Institute of Industrial Science and Technology Research, Tokai University, Kumamoto 862-8652, Japan
| | - A Fukuyama
- Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501, Japan
| | - Y Takase
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - K Matsumoto
- Honda R&D Co., Ltd. Automobile R&D Center, Haga, Tochigi 321-3393, Japan
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15
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Kuzmin A, Zushi H, Takagi I, Sharma S, 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. Spatial distribution of atomic and ion hydrogen flux and its effect on hydrogen recycling in long duration confined and non-confined plasmas. Nuclear Materials and Energy 2017. [DOI: 10.1016/j.nme.2017.03.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Shimozuma T, Yokoyama M, Ida K, Takeiri Y, Kubo S, Murakami S, Wakasa A, Idei H, Yoshimura Y, Notake T, Inagaki S, Tamura N, Toi K, Ohyabu N, Osakabe M, Ikeda K, Tsumori K, Oka Y, Nagaoka K, Kaneko O, Yamada I, Narihara K, Nagayam Y, Muto S, Tanaka K, Tokuzawa T, Morita S, Goto M, Yoshinuma M, Funaba H, Morisaki T, Watanabe KY, Miyazawa J, Mutoh T, Watari T, Ohkubo K. Improvement of Plasma Core Confinement Via Electron-Root Realization by Strongly Focused ECRH in LHD: Core Electron-Root Confinement. Fusion Science and Technology 2017. [DOI: 10.13182/fst10-a10791] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Murakami
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - A. Wakasa
- Kyoto University, Department of Nuclear Engineering, Kyoto 606-8501, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Notake
- RIKEN, Tera-Photonics Laboratory, Aoba Sendai-City, Miyagi 980-0845, Japan
| | - S. Inagaki
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - N. Tamura
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - I. Yamada
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nagayam
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Muto
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
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17
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Shimozuma T, Takahashi H, Kubo S, Yoshimura Y, Igami H, Takita Y, Kobayashi S, Ito S, Mizuno Y, Idei H, Notake T, Sato M, Ohkubo K, Watari T, Mutoh T, Minami R, Kariya T, Imai T. ECRH-Related Technologies for High-Power and Steady-State Operation in LHD. Fusion Science and Technology 2017. [DOI: 10.13182/fst58-530] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takita
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kobayashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Ito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Mizuno
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - T. Notake
- Tera-Photonics Laboratory, RIKEN, Aoba Sendai-City, Miyagi 980-0845, Japan
| | - M. Sato
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Minami
- Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
| | - T. Kariya
- Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
| | - T. Imai
- Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
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18
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Yoshimura Y, Kubo S, Shimozuma T, Igami H, Takahashi H, Kobayashi S, Ito S, Mizuno Y, Takita Y, Nakamura Y, Ohkubo K, Ikeda R, Ida K, Yoshinuma M, Sakakibara S, Mutoh T, Nagasaki K, Idei H, Notake T. Progress Toward Steady-State Operation in LHD Using Electron Cyclotron Waves. Fusion Science and Technology 2017. [DOI: 10.13182/fst58-551] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kobayashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Ito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Mizuno
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takita
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Ikeda
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagasaki
- Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - T. Notake
- Tera-Photonics Laboratory, RIKEN, Sendai 980-0845, Japan
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19
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Motojima O, Yamada H, Komori A, Watanabe KY, Mutoh T, Takeiri Y, Ida K, Akiyama T, Asakura N, Ashikawa N, Chikaraishi H, Cooper WA, Emoto M, Fujita T, Fujiwara M, Funaba H, Goncharov P, Goto M, Hamada Y, Higashijima S, Hino T, Hoshino M, Ichimura M, Idei H, Ido T, Ikeda K, Imagawa S, Inagaki S, Isayama A, Isobe M, Itoh T, Itoh K, Kado S, Kalinina D, Kaneba T, Kaneko O, Kato D, Kato T, Kawahata K, Kawashima H, Kawazome H, Kobuchi T, Kondo K, Kubo S, Kumazawa R, Lyon JF, Maekawa R, Mase A, Masuzaki S, Mito T, Matsuoka K, Miura Y, Miyazawa J, More R, Morisaki T, Morita S, Murakami I, Murakami S, Mutoh S, Nagaoka K, Nagasaki K, Nagayama Y, Nakamura Y, Nakanishi H, Narihara K, Narushima Y, Nishimura H, Nishimura K, Nishiura M, Nishizawa A, Noda N, Notake T, Nozato H, Ohdachi S, Ohkubo K, Ohyabu N, Oyama N, Oka Y, Okada H, Osakabe M, Ozaki T, Peterson BJ, Sagara A, Saida T, Saito K, Sakakibara S, Sakamoto M, Sakamoto R, Sasao M, Sato K, Seki T, Shimozuma T, Shoji M, Sudo S, Takagi S, Takahashi Y, Takase Y, Takenaga H, Takeuchi N, Tamura N, Tanaka K, Tanaka M, Toi K, Takahata K, Tokuzawa T, Torii Y, Tsumori K, Watanabe F, Watanabe M, Watanabe T, Watari T, Yamada I, Yamada S, Yamaguchi T, Yamamoto S, Yamazaki K, Yanagi N, Yokoyama M, Yoshida N, Yoshimura S, Yoshimura Y, Yoshinuma M. Review on the Progress of the LHD Experiment. Fusion Science and Technology 2017. [DOI: 10.13182/fst04-a535] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- O. Motojima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Komori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Akiyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Asakura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Chikaraishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - W. A. Cooper
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Emoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Fujita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Fujiwara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Funaba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - P. Goncharov
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Goto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Hamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Higashijima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Hino
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Hoshino
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Ichimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Idei
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Ido
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ikeda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Imagawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Inagaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Isayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Itoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Itoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Kado
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - D. Kalinina
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kaneba
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - D. Kato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Kawashima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Kawazome
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Kobuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Kondo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - J. F. Lyon
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Maekawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Mase
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Mito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Matsuoka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Miura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. More
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Morita
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - I. Murakami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Murakami
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Mutoh
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nagasaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nakanishi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Narihara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Narushima
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nishimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Nishimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Nishiura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Nishizawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Noda
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Notake
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Nozato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Ohdachi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Oyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Oka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Okada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Osakabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Ozaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - B. J. Peterson
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - A. Sagara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Saida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Saito
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Sasao
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Sato
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Seki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Shoji
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Sudo
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Takagi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takahashi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Takase
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - H. Takenaga
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Takeuchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Tamura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Tanaka
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Toi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Takahata
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Tokuzawa
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Torii
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Tsumori
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - F. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Watanabe
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Watari
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - I. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yamada
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - T. Yamaguchi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yamamoto
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - K. Yamazaki
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Yanagi
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - N. Yoshida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - S. Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
| | - M. Yoshinuma
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu-ken 509-5292, Japan
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Kariya T, Minami R, Imai T, Kato T, Idei H, Hanada K, Zushi H, Numakura T, Endo Y, Ichimura M. Development of 28 GHz Gyrotron for Cooperative ECH Study. Fusion Science and Technology 2017. [DOI: 10.13182/fst14-848] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- T. Kariya
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki, 305-8577, Japan
| | - R. Minami
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki, 305-8577, Japan
| | - T. Imai
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki, 305-8577, Japan
| | - T. Kato
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki, 305-8577, Japan
| | - H. Idei
- Kyusyu University, Research Institute for Applied Mechanics, Fukuoka, 816-8580, Japan
| | - K. Hanada
- Kyusyu University, Research Institute for Applied Mechanics, Fukuoka, 816-8580, Japan
| | - H. Zushi
- Kyusyu University, Research Institute for Applied Mechanics, Fukuoka, 816-8580, Japan
| | - T. Numakura
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki, 305-8577, Japan
| | - Y. Endo
- Kyusyu University, Research Institute for Applied Mechanics, Fukuoka, 816-8580, Japan
| | - M. Ichimura
- Kyusyu University, Research Institute for Applied Mechanics, Fukuoka, 816-8580, Japan
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Mitarai O, Nakamura K, Hasegawa M, Onchi T, Idei H, Fujisawa A, Hanada K, Zushi H, Higashijima A, Nakashima H, Kawasaki S, Matsuoka K, Koike S, Takahashi T, Tsutsui H. Comparative studies of inner and outer divertor discharges and a fueling study in QUEST. Fusion Engineering and Design 2016. [DOI: 10.1016/j.fusengdes.2015.12.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Idei H, Moriyama S, Kobayashi T, Isayama A, Sakaguchi M, Kasparek W. Research and Development of 2-frequency (110/138 GHz) FADIS for JT-60SA ECHCD system. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158704009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Banerjee S, Zushi H, Nishino N, Mishra K, Onchi T, Kuzmin A, Nagashima Y, Hanada K, Nakamura K, Idei H, Hasegawa M, Fujisawa A. Dynamical programming based turbulence velocimetry for fast visible imaging of tokamak plasma. Rev Sci Instrum 2015; 86:033505. [PMID: 25832227 DOI: 10.1063/1.4914838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An orthogonal dynamic programming (ODP) based particle image velocimetry (PIV) technique is developed to measure the time resolved flow field of the fluctuating structures at the plasma edge and scrape off layer (SOL) of tokamaks. This non-intrusive technique can provide two dimensional velocity fields at high spatial and temporal resolution from a fast framing image sequence and hence can provide better insights into plasma flow as compared to conventional probe measurements. Applicability of the technique is tested with simulated image pairs. Finally, it is applied to tangential fast visible images of QUEST plasma to estimate the SOL flow in inboard poloidal null-natural divertor configuration. This technique is also applied to investigate the intricate features of the core of the run-away dominated phase following the injection of a large amount of neutrals in the target Ohmic plasma. Development of the ODP-PIV code and its applicability on actual plasma images is reported.
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Affiliation(s)
- Santanu Banerjee
- Institute for Plasma Research, Bhat, Gandhinagar 382428, Gujarat, India
| | - H Zushi
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - N Nishino
- Mechanical System Engineering, Hiroshima University, Hiroshima 739-8527, Japan
| | - K Mishra
- IGSES, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - T Onchi
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - A Kuzmin
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - Y Nagashima
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - K Hanada
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - K Nakamura
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - H Idei
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - M Hasegawa
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
| | - A Fujisawa
- RIAM, Kyushu University, 6-1 Kasuga Koen, Kasuga-shi, Fukuoka 816-8580, Japan
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Mishra K, Zushi H, Idei H, Hasegawa M, Hanada K. High βpplasma formation using off-axis ECCD in Ohmic heated plasma in the spherical tokamak QUEST. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158702012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Mishra K, Idei H, Zushi H, Nagata K, Akimoto R, Yamamoto MK, Hanada K, Hasegawa M, Nakamura K, Fujisawa A, Nagashima Y, Banerjee S, Onchi T, Kuzmin A. Thermal imaging of plasma with a phased array antenna in QUEST. Rev Sci Instrum 2014; 85:11E808. [PMID: 25430373 DOI: 10.1063/1.4889903] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A thermal imaging system to measure plasma Electron Bernstein Emission (EBE) emanating from the mode conversion region in overdense plasma is discussed. Unlike conventional ECE/EBE imaging, this diagnostics does not employ any active mechanical scanning mirrors or focusing optics to scan for the emission cones in plasma. Instead, a standard 3 × 3 waveguide array antenna is used as a passive receiver to collect emission from plasma and imaging reconstruction is done by accurate measurements of phase and intensity of these signals by heterodyne detection technique. A broadband noise source simulating the EBE, is installed near the expected mode conversion region and its position is successfully reconstructed using phase array technique which is done in post processing.
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Affiliation(s)
- Kishore Mishra
- IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - H Idei
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - H Zushi
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - K Nagata
- IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - R Akimoto
- IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - M K Yamamoto
- Research Institute for Sustainable Humanosphere, Kyoto University, Uji 611-0011, Japan
| | - K Hanada
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - M Hasegawa
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - K Nakamura
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - A Fujisawa
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - Y Nagashima
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - S Banerjee
- IGSES, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - T Onchi
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
| | - A Kuzmin
- RIAM, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
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Idei H, Nagata K, Mishra K, Yamamoto MK, Itado T, Akimoto R, Hanada K, Zushi H. Adaptive array technique for differential-phase reflectometry in QUEST. Rev Sci Instrum 2014; 85:11D842. [PMID: 25430255 DOI: 10.1063/1.4891710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A Phased Array Antenna (PAA) was considered as launching and receiving antennae in reflectometry to attain good directivity in its applied microwave range. A well-focused beam was obtained in a launching antenna application, and differential-phase evolution was properly measured by using a metal reflector plate in the proof-of-principle experiment at low power test facilities. Differential-phase evolution was also evaluated by using the PAA in the Q-shu University Experiment with Steady State Spherical Tokamak (QUEST). A beam-forming technique was applied in receiving phased-array antenna measurements. In the QUEST device that should be considered as a large oversized cavity, standing wave effect was significantly observed with perturbed phase evolution. A new approach using derivative of measured field on propagating wavenumber was proposed to eliminate the standing wave effect.
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Affiliation(s)
- H Idei
- Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8560 Japan
| | - K Nagata
- Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan
| | - K Mishra
- Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan
| | - M K Yamamoto
- Research Institute for Sustainable Humanosphere, Kyoto Univ., Uji, 611-0011 Japan
| | - T Itado
- Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan
| | - R Akimoto
- Interdisciplinary Grad. School of Eng. Sci., Kyushu Univ., Kasuga, 816-8580 Japan
| | - K Hanada
- Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8560 Japan
| | - H Zushi
- Research Institute for Applied Mechanics, Kyushu Univ., Kasuga, 816-8560 Japan
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Hasegawa M, Nakamura K, Zushi H, Hanada K, Fujisawa A, Matsuoka K, Mitarai O, Idei H, Nagashima Y, Tokunaga K, Kawasaki S, Nakashima H, Higashijima A. Development of plasma control system for divertor configuration on QUEST. Fusion Engineering and Design 2013. [DOI: 10.1016/j.fusengdes.2013.03.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Banerjee S, Zushi H, Nishino N, Nagashima Y, Hanada K, Ishiguro M, Ryoukai T, Tashima S, Inoue T, Nakamura K, Idei H, Hasegawa M, Fujisawa A, Matsuoka K. Fast visible imaging and edge turbulence analysis in QUEST. Rev Sci Instrum 2012; 83:10E524. [PMID: 23127031 DOI: 10.1063/1.4739080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A fast visible imaging system is installed on the spherical tokamak QUEST to study edge turbulence. The camera uses a complementary metal-oxide semiconductor detector with a maximum resolution of 1024 × 1024 at 7000 frames∕s (fps) and can achieve 775 kfps at a resolution of 128 × 24. In this paper, we present the salient features of the system and its application to study edge turbulence in 8.2 GHz ECRH driven slab plasma, without plasma current. Vertical magnetic field (B(z)) topology is varied with three sets of poloidal field (PF) coils and the variation in the edge turbulence is investigated as a function of the B(z) strength and curvature. Fluctuation amplitude was highest for the shallow PF well. Cross-correlation coefficient shows distinct coherent mode along z direction at the steep density gradient region and it grows with the PF mirror ratio.
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Igami H, Yoshimura Y, Takahashi H, Shimozuma T, Kubo S, Idei H, Nishiura M, Ogasawara S, Makino R, Ohdachi S, Ida K, Yoshinuma M, Ido T, Shimizu A, Tamura N, Inagaki S, Mutoh T. Progress of ECRH by EBW in over-dense plasmas and controlling the confinement regime by ECCD with high power launching in LHD. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123202006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Plaum B, Kasparek W, Lechte C, Ruiz J, Tretiak D, Idei H. In-situ characterization of spurious modes in HE 11transmission lines with a 5-port coupler. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123204010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Sharma S, Zushi H, Yoshida N, Watanabe H, Osakabe M, Takeri Y, Hasegawa M, Tanabe T, Tokunaga K, Hanada K, Idei H, Sakamoto M, Nakamura K, Fujisawa A, Ishiguro M, Tashima S. Analysis of PWI footprint traces and material damage on the first walls of the spherical tokamak QUEST. Fusion Engineering and Design 2012. [DOI: 10.1016/j.fusengdes.2011.10.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Sharma SK, Zushi H, Takagi I, Hisano Y, Shikama T, Morita S, Tanabe T, Yoshida N, Sakamoto M, Higashizono Y, Hanada K, Hasegawa M, Mitarai O, Nakamura K, Idei H, Sato KN, Kawasaki S, Nakashima H, Higashijima A, Nakashima Y, Nishino N, Hatano Y, Sagara A, Nakamura Y, Ashikawa N, Maekawa T, Kishimoto Y, Takase Y. Hydrogen Permeation Measurements in the Spherical Tokamak QUEST and Its Numerical Modeling. Fusion Science and Technology 2011. [DOI: 10.13182/fst11-a12719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. K. Sharma
- IGSES, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - H. Zushi
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - I. Takagi
- DNE, Graduate School of Engineering, Kyoto University, Japan
| | - Y. Hisano
- IGSES, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - T. Shikama
- DNE, Graduate School of Engineering, Kyoto University, Japan
| | - S. Morita
- National Institute for Fusion Science, Toki, Japan
| | - T. Tanabe
- IGSES, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - N. Yoshida
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - M. Sakamoto
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - Y. Higashizono
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - K. Hanada
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - M. Hasegawa
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - O. Mitarai
- Kyushu Tokai University, 9-1-1 Toroku, Kumamoto 862-8, Japan
| | - K. Nakamura
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - H. Idei
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - K. N. Sato
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - S. Kawasaki
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - H. Nakashima
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - A. Higashijima
- RIAM, Kyushu University, Kasuga, Fukuoka, 816-8580, Japan
| | - Y. Nakashima
- Plasma Research Center, University of Tsukuba, Japan
| | - N. Nishino
- DMSE, Graduate School of Engineering, Hiroshima University, Japan
| | - Y. Hatano
- Hydrogen Isotope Research Center, Toyama University, Toyama 930-855, Japan
| | - A. Sagara
- National Institute for Fusion Science, Toki, Japan
| | - Y. Nakamura
- National Institute for Fusion Science, Toki, Japan
| | - N. Ashikawa
- National Institute for Fusion Science, Toki, Japan
| | - T. Maekawa
- DNE, Graduate School of Engineering, Kyoto University, Japan
| | - Y. Kishimoto
- DNE, Graduate School of Engineering, Kyoto University, Japan
| | - Y. Takase
- Graduate School of Frontier Science, University of Tokyo, Ibaragi, Japan
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Igami H, Kubo S, Shimozuma T, Yoshimura Y, Notake T, Takahashi H, Idei H, Inagaki S, Tanaka H, Nagasaki K, Ohkubo K, Mutoh T. Research of Electron Cyclotron Resonance Heating Methods and Relevant Experiments. Fusion Science and Technology 2010. [DOI: 10.13182/fst10-a10841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Igami
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Kubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Notake
- Tera-Photonics Laboratory, RIKEN, Sendai 980-0845, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - S. Inagaki
- Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
| | - H. Tanaka
- Graduate School of Energy Science, Kyoto University, Kyoto 606-8502, Japan
| | - K. Nagasaki
- Institute of Advanced Energy, Kyoto University, Uji 611-0011, Japan
| | - K. Ohkubo
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
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Hasegawa M, Higashijima A, Nakamura K, Hanada K, Sato K, Sakamoto M, Idei H, Kawasaki S, Nakashima H. A WEB-based integrated data processing system for the TRIAM-1M. Fusion Engineering and Design 2008. [DOI: 10.1016/j.fusengdes.2007.12.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Hasegawa M, Nakamura K, Higashijima A, Kawasaki S, Nakashima H, Sato K, Zushi H, Hanada K, Sakamoto M, Idei H. High accessible experimental information on CPD experiment. Fusion Engineering and Design 2008. [DOI: 10.1016/j.fusengdes.2007.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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Nakamura K, Hasegawa M, Wang F, Kawasaki S, Nakashima H, Higashijima A, Sato K, Zushi H, Hanada K, Sakamoto M, Idei H. Control system and the controllability of CPD and QUEST. Fusion Engineering and Design 2008. [DOI: 10.1016/j.fusengdes.2008.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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37
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Xu H, Hanada K, Hasegawa M, Wang M, Shen B, Zushi H, Nakamura K, Sato K, Sakamoto M, Idei H, Bhattacharyay R. The current control of steady-state plasma in TRIAM-1M and HT-7. Fusion Engineering and Design 2008. [DOI: 10.1016/j.fusengdes.2008.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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38
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Zushi H, Hanada K, Idei H, Hasegawa M, Sasaki K, Bhattacharyay R, Sakamoto M, Nakamura K, Sato KN, Kawasaki S, Nakashima H, Higashijima A. Electron Cyclotron Counter Current Drive Experiments in Lower Hybrid Current Drive Plasma in TRIAM-1M. Fusion Science and Technology 2007. [DOI: 10.13182/fst07-a1503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Zushi
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - K. Hanada
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - H. Idei
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - M. Hasegawa
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - K. Sasaki
- Kyushu University Interdisciplinary Graduate School of Engineering Sciences, 6-1 Kasuga koen Kasuga City, Fukuoka 816-8560, Japan
| | - R. Bhattacharyay
- Kyushu University Interdisciplinary Graduate School of Engineering Sciences, 6-1 Kasuga koen Kasuga City, Fukuoka 816-8560, Japan
| | - M. Sakamoto
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - K. Nakamura
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - K. N. Sato
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - S. Kawasaki
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - H. Nakashima
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
| | - A. Higashijima
- Kyushu University, Research Institute for Applied Mechanics, Fukuoka, Japan
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Hanada K, Sugata T, Sakamoto M, Zushi H, Nakamura K, Sato K, Idei H, Hasegawa M, Higashijima A, Kawasaki S, Nakashima H. Power balance investigation in steady-state LHCD discharges on TRIAM-1M. Fusion Engineering and Design 2006. [DOI: 10.1016/j.fusengdes.2006.03.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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40
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Shiraiwa S, Hanada K, Hasegawa M, Idei H, Kasahara H, Mitarai O, Nakamura K, Nishino N, Nozato H, Sakamoto M, Sasaki K, Sato K, Takase Y, Yamada T, Zushi H. Heating by an electron Bernstein wave in a spherical tokamak plasma via mode conversion. Phys Rev Lett 2006; 96:185003. [PMID: 16712369 DOI: 10.1103/physrevlett.96.185003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2006] [Indexed: 05/09/2023]
Abstract
The first successful high power heating of a high dielectric constant spherical tokamak plasma by an electron Bernstein wave (EBW) is reported. An EBW was excited by mode conversion (MC) of an mode cyclotron wave injected from the low magnetic field side of the TST-2 spherical tokamak. Evidence of electron heating was observed as increases in the stored energy and soft x-ray emission. The increased emission was concentrated in the plasma core region. A heating efficiency of over 50% was achieved, when the density gradient in the MC region was sufficiently steep.
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Affiliation(s)
- S Shiraiwa
- Graduate School of Frontier Sciences, University of Tokyo, Kashiwa 277-8561, Japan.
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Nakamura K, Luo J, Wang H, Ji Z, Wang H, Wang F, Qi N, Sato K, Hanada K, Sakamoto M, Idei H, Hasegawa M, Iyomasa A, Kawasaki S, Nakashima H, Higashijima A. Magnetic sensorless control experiment without drift problem on HT-7. Fusion Engineering and Design 2006. [DOI: 10.1016/j.fusengdes.2005.08.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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42
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Notake T, Idei H, Shimozuma T, Sato M, Kubo S, Ito S, Takita Y, Ohkubo K, Yoshimura Y, Kobayashi S, Mizuno Y, Watari T, Kumazawa R, Shapiro M, Temkin R. Evaluation of phase correcting mirrors for an 84GHz gyrotron based on direct phase measurements at low-power level. Fusion Engineering and Design 2005. [DOI: 10.1016/j.fusengdes.2004.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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43
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Nagayama Y, Kawahata K, Inagaki S, Peterson BJ, Sakakibara S, Tanaka K, Tokuzawa T, Watanabe KY, Ashikawa N, Chikaraishi H, Emoto M, Funaba H, Goto M, Hamada Y, Ichiguchi K, Ida K, Idei H, Ido T, Ikeda K, Imagawa S, Isayama A, Isobe M, Iwamoto A, Kaneko O, Kitagawa S, Komori A, Kubo S, Kumazawa R, Masuzaki S, Matsuoka K, Mito T, Miyazawa J, Morisaki T, Morita S, Motojima O, Murakami S, Mutoh T, Muto S, Nakajima N, Nakamura Y, Nakanishi H, Narihara K, Narushima Y, Nishimura A, Nishimura K, Nishizawa A, Noda N, Ohdachi S, Ohkubo K, Ohyabu N, Oka Y, Osakabe M, Ozaki T, Sagara A, Saito K, Sakamoto R, Sasao M, Sato K, Seki T, Shimozuma T, Shoji M, Suzuki H, Sudo S, Takahata K, Takeiri Y, Toi K, Tsumori K, Yamada H, Yamada I, Yamazaki K, Yanagi N, Yokoyama M, Yoshimura Y, Yoshinuma Y, Watari T. Sawtooth oscillation in current-carrying plasma in the large helical device. Phys Rev Lett 2003; 90:205001. [PMID: 12785901 DOI: 10.1103/physrevlett.90.205001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2002] [Indexed: 05/24/2023]
Abstract
Sawtooth oscillations have been observed in current-carrying helical plasmas by using electron-cyclotron-emission diagnostics in the Large Helical Device. The plasma current, which is driven by neutral beam injection, reduces the beta threshold of the sawtooth oscillation. When the central q value is increased due to the plasma current, the core region crashes, and, when it is decreased, the edge region crashes annularly. Observed rapid mixture of the plasma in the limited region suggests that these sawtooth crashes are reconnection phenomena. Unlike previous experiments, no precursor oscillation has been observed.
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Affiliation(s)
- Y Nagayama
- National Institute for Fusion Science, Toki 509-5292, Japan
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Ohyabu N, Ida K, Morisaki T, Narihara K, Komori A, Watanabe K, Narushima Y, Nagayama Y, Shoji M, Ashikawa N, Emoto M, Funaba H, Goto M, Idei H, Ikeda K, Inagaki S, Inoue N, Isobe M, Khlopenkov K, Kobuchi T, Kostrioukov A, Kubo S, Kumazawa R, Liang Y, Masuzaki S, Minami T, Miyazawa J, Morita S, Muto S, Mutoh T, Murakami S, Nakamura Y, Nakanishi H, Nishimura K, Noda N, Notake T, Ohkubo K, Ohdachi S, Oka Y, Osakabe M, Ozaki T, Peterson BJ, Sakamoto R, Sakakibara S, Sagara A, Saito K, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Sudo S, Suzuki H, Takeiri Y, Tanaka K, Tamura N, Toi K, Tokuzawa T, Torii Y, Tsumori K, Watanabe T, Yamazaki K, Yamada I, Yamamoto S, Yokoyama M, Yoshimura Y, Watari T, Xu Y, Kaneko O, Kawahata K, Yamada H, Motojima O. Island dynamics in the large-helical-device plasmas. Phys Rev Lett 2002; 88:055005. [PMID: 11863738 DOI: 10.1103/physrevlett.88.055005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2001] [Indexed: 05/23/2023]
Abstract
In the Large Helical Device plasma discharges, the size of an externally imposed island with mode number ( n/m = 1/1) decreases substantially when the plasma is collisionless ( nu(*)< approximately 1) and the beta is finite ( > approximately 0.1%) at the island location. For the collisional plasmas with finite beta, on the other hand, the size of the island increases. However, there is a threshold in terms of the vacuum island size below which the island enlargement is not seen.
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Affiliation(s)
- N Ohyabu
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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Narihara K, Watanabe KY, Yamada I, Morisaki T, Tanaka K, Sakakibara S, Ida K, Sakamoto R, Ohyabu N, Ashikawa N, Emoto M, Funaba H, Goto M, Hayashi H, Idei H, Ikeda K, Inagaki S, Inoue N, Kaneko O, Kawahata K, Kobuchi T, Komori A, Kubo S, Kumazawa R, Masuzaki S, Miyazawa J, Morita S, Motojima O, Murakami S, Muto S, Mutoh T, Nagayama Y, Nakamura Y, Nakanishi H, Nishimura K, Noda N, Notake T, Ohdachi S, Oka Y, Ohkubo K, Osakabe M, Ozaki S, Peterson BJ, Sagara A, Saito K, Sasao H, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Shoji C, Sudo S, Suzuki H, Takayama A, Takechi M, Takeiri Y, Tamura N, Toi K, Tokuzawa N, Torii Y, Tsumori K, Watari T, Yamada H, Yamaguchi S, Yamamoto S, Yamazaki K, Yoshimura Y. Observation of the "self-healing" of an error field island in the large helical device. Phys Rev Lett 2001; 87:135002. [PMID: 11580597 DOI: 10.1103/physrevlett.87.135002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2001] [Indexed: 05/23/2023]
Abstract
It was observed that the vacuum magnetic island produced by an external error magnetic field in the large helical device shrank in the presence of plasma. This was evidenced by the disappearance of flat regions in the electron temperature profile obtained by Thomson scattering. This island behavior depended on the magnetic configuration in which the plasmas were produced.
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Affiliation(s)
- K Narihara
- National Institute for Fusion Science, Toki, 509-5292, Japan
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Ida K, Funaba H, Kado S, Narihara K, Tanaka K, Takeiri Y, Nakamura Y, Ohyabu N, Yamazaki K, Yokoyama M, Murakami S, Ashikawa N, deVries PC, Emoto M, Goto M, Idei H, Ikeda K, Inagaki S, Inoue N, Isobe M, Itoh K, Kaneko O, Kawahata K, Khlopenkov K, Komori A, Kubo S, Kumazawa R, Liang Y, Masuzaki S, Minami T, Miyazawa J, Morisaki T, Morita S, Mutoh T, Muto S, Nagayama Y, Nakanishi H, Nishimura K, Noda N, Notake T, Kobuchi T, Ohdachi S, Ohkubo K, Oka Y, Osakabe M, Ozaki T, Pavlichenko RO, Peterson BJ, Sagara A, Saito K, Sakakibara S, Sakamoto R, Sanuki H, Sasao H, Sasao M, Sato K, Sato M, Seki T, Shimozuma T, Shoji M, Suzuki H, Sudo S, Tamura N, Toi K, Tokuzawa T, Torii Y, Tsumori K, Yamamoto T, Yamada H, Yamada I, Yamaguchi S, Yamamoto S, Yoshimura Y, Watanabe KY, Watari T, Hamada Y, Motojima O, Fujiwara M. Reduction of ion thermal diffusivity associated with the transition of the radial electric field in neutral-beam-heated plasmas in the large helical device. Phys Rev Lett 2001; 86:5297-5300. [PMID: 11384482 DOI: 10.1103/physrevlett.86.5297] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2001] [Indexed: 05/23/2023]
Abstract
Recent large helical device experiments revealed that the transition from ion root to electron root occurred for the first time in neutral-beam-heated discharges, where no nonthermal electrons exist. The measured values of the radial electric field were found to be in qualitative agreement with those estimated by neoclassical theory. A clear reduction of ion thermal diffusivity was observed after the mode transition from ion root to electron root as predicted by neoclassical theory when the neoclassical ion loss is more dominant than the anomalous ion loss.
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Affiliation(s)
- K Ida
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 509-5292, Japan
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Shimozuma T, Kubo S, Sato M, Idei H, Takita Y, Ito S, Kobayashi S, Mizuno Y, Yoshimura Y, Ohkubo K, Funaba H, Inagaki S, Kobuchi T, Masuzaki S, Muto S, Shoji M, Suzuki H, Noda N, Nakamura Y, Kawahata K, Ohyabu N, Motojima O. ECH system and its application to long pulse discharge in large helical device. Fusion Engineering and Design 2001. [DOI: 10.1016/s0920-3796(00)00529-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yamada H, Watanabe KY, Sakakibara S, Murakami S, Osakabe M, Kaneko O, Narihara K, Tanaka K, Ida K, Minami T, Goto M, Idei H, Inagaki S, Kado S, Kawahata K, Komori A, Kubo S, Miyazawa J, Morisaki T, Morita S, Nakanishi H, Ohdachi S, Ohyabu N, Oka Y, Peterson BJ, Sakamoto R. Energy confinement time and heat transport in initial neutral beam heated plasmas on the large helical device. Phys Rev Lett 2000; 84:1216-1219. [PMID: 11017482 DOI: 10.1103/physrevlett.84.1216] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/1999] [Indexed: 05/23/2023]
Abstract
The confinement characteristics of large net-current-free plasmas heated by neutral-beam injection have been investigated in the Large Helical Device (LHD). A systematic enhancement in energy-confinement times from the scaling derived from the medium-sized heliotron/torsatron experiments have been observed, which is attributed to the edge pedestal. The core confinement is scaled with the Bohm term divided by the square root of the gyro radii. The comparative analysis using a dimensionally similar discharge in the Compact Helical System indicates gyro-Bohm dependence in the core and transport improvement in the edge region of LHD plasmas.
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Affiliation(s)
- H Yamada
- National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
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Ohyabu N, Narihara K, Funaba H, Morisaki T, Masuzaki S, Kawahata K, Komori A, Kaneko O, Yamada H, deVries P, Emoto M, Goto M, Hamada Y, Ida K, Idei H, Inagaki S, Inoue N, Kado S, Kubo S, Kumazawa R, Minami T, Miyazawa J, Morita S, Murakami S, Mutoh T, Muto S. Edge thermal transport barrier In LHD discharges. Phys Rev Lett 2000; 84:103-106. [PMID: 11015845 DOI: 10.1103/physrevlett.84.103] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/1999] [Indexed: 05/23/2023]
Abstract
In LHD discharges a significant enhancement of the global energy confinement has been achieved for the first time in a helical device with an edge thermal barrier, which exhibits a sharp gradient at the edge of the temperature profile. Key features associated with the barrier are quite different from those seen in tokamaks: (i) almost no change in particle (including impurity) transport, (ii) a gradual formation of the barrier, (iii) a very high ratio of the edge temperature to the average temperature, and (iv) no edge relaxation phenomenon. These features are very attractive in applying the thermal barrier to future reactor grade devices.
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Affiliation(s)
- N Ohyabu
- National Institute for Fusion Science, Toki, Gifu-ken, Japan
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Abstract
PURPOSE Ischemic colitis develops after a sudden decrease in colonic blood supply and has a variety of clinical manifestations. The aim of this study was to assess the role of platelet activating factor in the pathogenesis of ischemic colitis with use of the platelet activating factor antagonist TCV-309. METHODS Rats were randomly divided into four groups. Rats in Group RV underwent ring attachment around the rectum to induce partial obstruction and ligation of the marginal vessels of the left colon. As control, rats in Group R underwent the ring attachment and rats in Group V underwent the vascular ligation. Rat in Group C underwent sham operation. The effects of TCV-309 on lesion formation in the colon were evaluated. Thiobarbituric acid reactant level was determined in colonic mucosa, and the incidence and severity of ischemic lesions were also determined. RESULTS Lesions of colitis were frequently observed in Group RV. TCV-309 did not prevent lesion formation, nor did it suppress the increase in thiobarbituric acid reactant level in Group RV. However, TCV-309 mitigated the severity of the lesion. CONCLUSIONS Partial obstruction of the colon tends to induce ischemic colitis, and additional ischemia completes lesion formation. Platelet activating factor may play a role in the progression of ischemic lesions.
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Affiliation(s)
- Y Nagahata
- First Department of Surgery, Kobe University School of Medicine, Japan
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