Clarification of role of neoclassical ion viscosity on confinement transition to improved mode

• Project/Area Number: 26820399
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Takahashi Hiromi 核融合科学研究所, ヘリカル研究部, 准教授 (00462193)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 新古典ポロイダル粘性 / 径電場 / ポロイダル回転 / 電極バイアス / 閉じ込め改善 / トロイダルプラズマ / ポロイダル粘性 / プラズマ回転 / LHD / Heliotron J / TJ-II / Heiotron J

Outline of Final Research Achievements

In order to clarify the role of neoclassical ion viscosity on confinement transition to improvement mode in toroidal plasma, electrode biasing experiments were carried out in the LHD, the Heliotron J, and the TJ - II, which are the helical-type devices with different magnetic field ripple structure. In the LHD, electrode biasing experiments were conducted with magnetic configuration with large viscosity, and then that the transition condition was consistent between the experimental results and the theoretical prediction. In the Heliotron J, we succeeded in constructing an electrode biasing system with better heating property and conducting experiments with a low collisionality condition, where the influence of viscosity is dominant in the momentum drag force. In the TJ-II, we conducted initial electrode biasing experiments using existing systems, and then constructed a more appropriate experimental environment than before.

Research Products

• [Int'l Joint Research] スペインエネルギー・環境・技術・研究センター (CIEMAT)(スペイン)
• [Int'l Joint Research] スペインエネルギー・環境・技術・研究センター (CIEMAT)(スペイン)
• [Int'l Joint Research] CIEMAT研究所(スペイン)
• [Journal Article] Extension of operational regime in high-temperature plasmas and effect of ECRH on ion thermal transport in the LHD (2017)
  • Author(s): Takahashi H., Nagaoka K., Murakami S., Osakabe M., Nakano H., Ida K., Tsujimura T. I., Kubo S., Kobayashi T., Tanaka K., Seki R., Takeiri Y., Yokoyama M., Maeta S., Nakata M. et al
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 8 Pages: 086029-086029
  • DOI: 10.1088/1741-4326/aa754b
  • NAID: 120007176952
  • Peer Reviewed
• [Journal Article] Extension of Operational Regime in High-Temperature Plasmas and Effect of ECRH on Ion Thermal Transport in the LHD (2016)
  • Author(s): 高橋裕己, 永岡賢一, 村上定義, 長壁正樹, 中野治久, 居田克巳, 辻村亨, 久保伸, 小林達哉, 田中謙治, 關良輔, 竹入康彦, 横山雅之, 仲田資季, 吉沼幹朗, 山田一博, 安原亮, 井戸毅, 清水昭博, 土屋隼人, 以下19名
  • Journal Title: Proceedings of the 26th IAEA Fusion Energy Conference Volume: -
  • NAID: 120007176952
• [Journal Article] Effect of the RF wall conditioning on the high performance plasmas in the Large Helical Device (2015)
  • Author(s): 高橋裕己, 長壁正樹, 永岡賢一, 中野治久, 時谷政行, 藤井恵介, 村上定義, 竹入康彦, 関哲夫, 齋藤健二, 笠原寛史, 關良輔, 神尾修治, 増﨑貴, 武藤敬, LHD実験グループ
  • Journal Title: J. Nucl. Mater Volume: 463 Pages: 1100-1103
  • DOI: 10.1016/j.jnucmat.2014.11.131
  • Peer Reviewed
• [Journal Article] Direct measurement of refracted trajectory of transmitting electron cyclotron beam through plasma on the Large Helical Device (2015)
  • Author(s): 高橋裕己, 久保伸, 下妻隆, 伊神弘恵, 吉村泰夫, 伊藤哲, 小林策治, 水野嘉識, 岡田宏太, 神尾修治, 武藤敬, 長壁正樹, 長﨑百伸, Nikolai B. Marushchenko, Yuri Turkin, LHD実験グループ
  • Journal Title: EPJ Web of Conferences Volume: 87 Pages: 02019-02019
  • DOI: 10.1051/epjconf/20158702019
• [Journal Article] High Ion Temperature Plasmas using an ICRF Wall-Conditioning Technique in the Large Helical Device (2014)
  • Author(s): 高橋裕己, 他10名
  • Journal Title: Plasma and Fusion Research Volume: 9 Issue: 0 Pages: 1402050-1402050
  • DOI: 10.1585/pfr.9.1402050
  • NAID: 130005088367
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Extension of high Te regime with upgraded electron cyclotron resonance heating system in the Large Helical Device, Extension of high Te regime with upgraded electron cyclotron resonance heating system in the Large Helical Device (2014)
  • Author(s): H. Takahashi, T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, S. Ito, S. Kobayashi, Y. Mizuno, K. Okada, T. Muto, K. Nagaoka, S. Murakami, M. Osakabe, I. Yamada, H. Nakano, M. Yokoyama, T. Ido, A. Shimizu, R. Seki, K. Ida, M. Yoshinuma, T. Kariya, R. Minami, T. Imai
  • Journal Title: Physics of Plasmas Volume: 21 Issue: 6
  • DOI: 10.1063/1.4884365
  • Peer Reviewed
• [Presentation] Ion heating through equipartition process and the first results of high-Ti experiments with deuterium in LHD (2017)
  • Author(s): 高橋裕己
  • Organizer: Japan-US Workshop on Fusion Power Plants and Related Advanced Technologies
  • Place of Presentation: 核融合科学研究所 (岐阜県土岐市)
  • Year and Date: 2017-03-27
  • Int'l Joint Research
• [Presentation] Confinement characteristics of ion ITB plasmas with deuterium in the LHD (2017)
  • Author(s): 高橋裕己、永岡賢一、向井清史 (他24名)
  • Organizer: International Stellarator/Heliotron Workshop 2017
  • Int'l Joint Research / Invited
• [Presentation] LHDにおける高Te/Tiプラズマのイオンの熱閉じ込め特性 (2017)
  • Author(s): 高橋裕己, 吉村泰夫, 關良輔, 横山雅之, 坂本隆一, 江尻晶, LHD実験グループ
  • Organizer: プラズマコンファレンス2017
• [Presentation] LHDの高Teプラズマにおける熱緩和によるイオン加熱 (2016)
  • Author(s): 高橋裕己, 永岡賢一, 關良輔, 東井和夫, 長壁正樹, 横山雅之, 吉村泰夫, 久保伸, 村上定義, 江尻晶
  • Organizer: 第33回プラズマ・核融合学会 年会
  • Place of Presentation: 東北大学 (宮城県仙台市)
  • Year and Date: 2016-11-29
• [Presentation] Extension of Operational Regime in High-Temperature Plasmas and Effect of ECRH on Ion Thermal Transport in the LHD (2016)
  • Author(s): 高橋裕己, 永岡賢一, 村上定義, 長壁正樹, 中野治久, 居田克巳, 辻村亨, 久保伸, 小林達哉, 田中謙治, 關良輔, 竹入康彦, 横山雅之, 仲田資季, 吉沼幹朗, 山田一博, 安原亮, 井戸毅, 清水昭博, 土屋隼人, 以下19名
  • Organizer: 26th IAEA Fusion Energy Conference
  • Place of Presentation: 国立京都国際会館 (京都府京都市)
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] LHDプラズマにおける高温度領域拡大の進展 (2015)
  • Author(s): 高橋裕己, 永岡賢一, 長壁正樹, 村上定義, 辻村亨, 久保伸, 小林達哉, 田中謙治, 中野治久, 關良輔, 長﨑百伸, 居田克巳, 吉沼幹朗, 井戸毅, 清水昭博, 山田一博, 安原亮, 横山雅之, 土屋隼人, 榊原悟, 武村勇輝, 武藤敬, 竹入康彦, LHD実験グループ
  • Organizer: 第32回プラズマ・核融合学会 年会
  • Place of Presentation: 名古屋市
  • Year and Date: 2015-11-24
• [Presentation] Ion heating by ECRH through the equipartition process in the LHD (2015)
  • Author(s): 高橋裕己, 永岡賢一, 關良輔, 長壁正樹, 横山雅之, 吉村泰夫, 坂本隆一, 久保伸, 村上定義, 江尻晶, LHD実験グループ
  • Organizer: 25th International Toki Conference
  • Place of Presentation: Toki, Japan
  • Year and Date: 2015-11-03
  • Int'l Joint Research
• [Presentation] Non-local interaction of ion thermal transport between core and edge triggered by ECRH on the LHD plasma (2015)
  • Author(s): 高橋裕己, 永岡賢一, 村上定義, 長壁正樹, 中野治久, 居田克巳, 吉沼幹朗, 田中謙治, 辻村亨, 久保伸, 小林達哉, 關良輔, 仲田資季, 横山雅之, 井戸毅, 清水昭博, 土屋隼人, LHD実験グループ
  • Organizer: 20th International Stellarator-Heliotron Workshop
  • Place of Presentation: Greifswald, Germany
  • Year and Date: 2015-10-05
  • Int'l Joint Research / Invited
• [Presentation] ECRH system upgrade for high temperature plasmas in the LHD (2015)
  • Author(s): 高橋裕己, 下妻隆, 久保伸, 吉村泰夫, 伊神弘恵, 辻村亨, 牧野良平, 神尾修治, 伊藤哲, 小林策治, 水野嘉識, 岡田宏太, 武藤敬, 假家強, 南龍太郎, 今井剛
  • Organizer: Workshop on RF Heating Technology of Fusion Plasmas
  • Place of Presentation: Tokyo, Japan
  • Year and Date: 2015-08-31
  • Int'l Joint Research
• [Presentation] Recent Progress of Extension of High Temperature Regime using Upgraded ECRH System on the LHD Plasma (2014)
  • Author(s): 高橋裕己, 永岡賢一, 中野治久, 村上定義, 下妻隆, 久保伸, 吉村泰夫, 伊神弘恵, 伊藤哲, 小林策治, 水野嘉識, 岡田宏太, 武藤敬, LHD実験グループ
  • Organizer: US-Japan Workshop on RF Heating Physics 2014
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2014-09-17 – 2014-09-19
• [Presentation] LHDにおけるRF壁コンディショニングによる高イオン温度プラズマの実現 (2014)
  • Author(s): 高橋裕己, 長壁正樹, 永岡賢一, 中野治久, 時谷政行, 藤井恵介, 村上定義, 竹入康彦, 武藤敬
  • Organizer: 第10回核融合エネルギー連合講演会
  • Place of Presentation: つくば
  • Year and Date: 2014-06-19 – 2014-06-20
• [Presentation] Simultaneous formation of ion and electron internal transport barriers by temperature profile control in the LHD (2014)
  • Author(s): 高橋裕己, 永岡賢一, 中野治久, 村上定義, 居田克巳, 長壁正樹, 竹入康彦, 關良輔, 鈴木千尋, 吉沼幹朗, 井戸毅, 清水昭博, 武藤敬, LHD実験グループ
  • Organizer: 4th Asia Pacific Transport Working Group International Conference
  • Place of Presentation: Kasuga, Japan
  • Year and Date: 2014-06-10 – 2014-06-13
• [Presentation] Effect of the RF wall conditioning on the high performance plasmas in the Large Helical Device (2014)
  • Author(s): 高橋裕己, 長壁正樹, 永岡賢一, 中野治久, 時谷政行, 藤井恵介, 村上定義, 竹入康彦, 関哲夫, 齋藤健二, 笠原寛史, 關良輔, 神尾修治, 増﨑貴, 武藤敬, LHD実験グループ
  • Organizer: 21st International Conference on Plasma Surface Interactions
  • Place of Presentation: Kanazawa, Japan
  • Year and Date: 2014-05-26 – 2014-05-30
• [Presentation] Direct measurement of refracted trajectory of transmitting electron cyclotron beam through plasma on the Large Helical Device (2014)
  • Author(s): 高橋裕己, 久保伸, 下妻隆, 伊神弘恵, 吉村泰夫, 伊藤哲, 小林策治, 水野嘉識, 岡田宏太, 神尾修治, 武藤敬, 長壁正樹, 長﨑百伸, Nikolai B. Marushchenko, Yuri Turkin, LHD実験グループ
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission
  • Place of Presentation: Nara, Japan
  • Year and Date: 2014-04-22 – 2014-04-25
• [Remarks] プラズマ加熱物理研究系 _ 核融合科学研究所
  • URL: http://www.nifs.ac.jp/rd/phprd/index.html
• [Remarks] ech.pdf
  • URL: http://www.nifs.ac.jp/rd/phprd/publications/ech.pdf