定常化球状トカマクの突発事象を支配するメゾスケール物理とマクロ系制御

2010 Fiscal Year Annual Research Report

• Project/Area Number: 21246139
• Research Institution: Kyushu University
• Principal Investigator: 図子 秀樹 九州大学, 応用力学研究所, 教授 (20127096)
• Co-Investigator(Kenkyū-buntansha): 四竈 泰一 京都大学, 工学研究科, 講師 (80456152)
• Keywords: メゾスケール / blob / fast camera

Research Abstract

本研究は高ベータトカマクプラズマの定常化にむけた研究課題として"突発事象を支配するメゾスケール物理解明とマクロ系制御"という観点で、"開放磁場配位から閉磁気面の独立"、"2つの閉磁気面の接触"、"閉磁気面と開放磁気面の接触"という状況下での磁気再結合によるマクロ構造形成過程とその制御性を調べることを目的とする。H22年度には(1)非誘導方式での閉じ込め配位の形成過程に関して、特にヘリカル状のフィラメント構造の発現、成長、伝播過程を高速カメラで観測し、ミクロ揺動から、メゾスケールのプラズマ塊と成長し、それのマクロ空間の伝播という観点で、主として統計解析の手法で研究を行った。統計解析により揺らぎの成長を支配する偶然力の実験的定義、揺動の確率密度分布の物理的位置づけに関して研究を進め、これらがPearson systemに属することを明らかにし、確率微分方程式の実験的決定に関して成果を上げることができた。こうした研究の特徴は揺動における非線形項ならびに非線形偶然力を区別して理解する手法として近年注目されている揺らぎの高次モーメントを解析し、特に、3,4次モーメント間に簡単なパラボリックな関係が広範囲に観測されることを明らかにした点である。さらにこの観測が特定の領域で強く強調される様子を明らかにした。その結果は2つの国際会議で発表し、査読雑誌1ならびに投稿中論文として公表した。さらに関連する高速電子の挙動のX線計測、金属中の水素粒子の拡散過程の解析などを平行して実施した。

Research Products

• [Journal Article] Study of the plasma driven permeation of hydrogen through a nickel membrane in RF and ohmic plasmas in the spherical tokamak QUEST (2010)
  • Author(s): S. K. Sharma, H. Zushi, et.al
  • Journal Title: Journal of Plasma and Fusion Research Series Volume: 9 Pages: 142-146
  • Peer Reviewed
• [Journal Article] Hard X-ray measurement during the current startup phase in QUEST (2010)
  • Author(s): S. Tashima, H. Zushi, et.al
  • Journal Title: Journal of Plasma and Fusion Research Series Volume: 9 Pages: 316-321
  • Peer Reviewed
• [Journal Article] Measurement of hydrogen permeation due to atmic flux using permeation probe in the spherical tokamak QUEST (2010)
  • Author(s): SanjieevK Sharma, Hideki Zushi, Ikuji Takagi, Yuki Hisano, Mizuki Aakamoto, Yuta Higashizono, Taichi Shikama, Sigeru Morita, Tetsuo Tanabe, Naoaki Yoshida, Kazuaki Hanada, Makoto Hasegawa, Osamu Mitarai, Kazuo Nakamura, Hiroshi Idei, Kohnosuke N Sato, Shoji Kawasaki, Hisatoshi Nakashima, Aki Higashijima, Yousuke Nakashima, Nobuyuki Nishino, Yuji Hatano, Akira Sagara, Yukio Nakamura, Naoka Ashikawa, Takashi Maekawa
  • Journal Title: Fusion Engineering and Design Volume: 85 Pages: 950-955
  • Peer Reviewed
• [Journal Article] Acceleration of Blob driven by Helcal Instability In a Simple Magnetic Configuration in QUEST (2010)
  • Author(s): H.Zushi, N.Nishino, K.Hanada, H.Honma, H.Q.Liu Y.Higashizono, M Sakamoto, Ogata, S.Tashima, T.Ryoukai, QUEST group
  • Journal Title: Journal of Nuclear Materials Volume: (online) Pages: 1-4
  • Peer Reviewed
• [Journal Article] Analysis of the footprint traces on first walls of the compact plasma wall interaction device CPD using surface analysis and electron orbit calculations (2010)
  • Author(s): S.K.Sharma, H.Zushi, M.Osakabe, Y.Takeiri, N.Yoshida, M.Hasegawa, T.Yoshinaga, K.Hanada, H.Idei, M.Sakamoto, K.Nakamura, K.N.Sato, CPD Group
  • Journal Title: Nuclear Fusion Volume: 50 Pages: 025017(11)
  • Peer Reviewed
• [Journal Article] The correlation analysis between electron density fluctuation and RF stray power in the CPD electron cyclotron plasma (2010)
  • Author(s): T.Ryoukai, H.Zushi, T.Morisaki, H.Idei, K.Hanada, T.Mutoh, S.Kubo, K.Nagasaki, CPD experiment group
  • Journal Title: Journal of Plasma and Fusion Research Series Volume: 9 Pages: 310-315
  • Peer Reviewed
• [Journal Article] Calculation of a magnetic field effect on emission spectra of light diatomic molecules for diagnostic application to fusion edge plasmas (2010)
  • Author(s): T.Shikama, K.Fujii, K.Mizushiri, M.Hasuo, S.Kado, H.Zushi
  • Journal Title: Plasma Physics and Controlled Fusion Volume: 51 Pages: 122001(9)
  • Peer Reviewed
• [Presentation] Plasma polarization spectroscopy of atomic and molecular emission from magnetically confined plasmas (2010)
  • Author(s): T.Shikama, K.Fujii, S.Kado, H.Zushi, M.Sakamoto, A.Iwamae, M.Goto, S.Morita, M.Hasuo
  • Organizer: 10th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas
  • Place of Presentation: Berkeley, California U.S.A.
  • Year and Date: 20100803-20100807
• [Presentation] Wall pumping studies in spherical tokamak QUEST using permeation measurements and a static gas balance method (2010)
  • Author(s): S.K.Sharma, H.Zushi, I.Takagi, Y.Hisano, T.Shikama, S.Morita, T.Tanabe, N.Yoshida, M.Sakamoto, Y.Higashizono, K.Hanada, M.Hasegawa, O.Mitarai, K.Nakamura, H.Idei, K.N.Sato, S.Kawasaki, H.Nakashima, A.Higashijima, Y.Nakashima, N.Nishino, Y.Hatano, A.Sagara, Y.Nakamura, N.Ashikawa, T.Maekawa, Y.Kishimoto, Y.Tasase, QUEST group
  • Organizer: 19th International Conference on Plasma Surface Interactions
  • Place of Presentation: San Diego, U.S.A
  • Year and Date: 20100524-20100528
• [Presentation] Acceleration of Blob driven by Helcal Instability In a Simple Magnetic Configuration in QUEST (2010)
  • Author(s): H.Zushi, N.Nishino, K.Hanada, H.Honma, H.Q.Liu Y.Higashizono, M Sakamoto, Ogata, S.Tashima, T.Ryoukai, QUEST group
  • Organizer: 19th International Conference on Plasma Surface Interactions
  • Place of Presentation: San Diego, U.S.A
  • Year and Date: 20100524-20100528
• [Presentation] Hydrogen Permeation and Recombination in Ni Membrane Place on Spherical Tokamak QUEST (2010)
  • Author(s): I.Takagi, H.Zushi, R.Imade, T.Komura, S.K.Sharma, Y.Hisano, Y.Hatano, Y.Nakamura, A.Sagara, N.Ashikawa
  • Organizer: 19th International Conference on Plasma Surface Interactions
  • Place of Presentation: San Diego, U.S.A
  • Year and Date: 20100524-20100528
• [Presentation] Hydrogen Permeation Measurements in the Spherical Tokamak QUEST and its Numerical Modeling (2010)
  • Author(s): S.K.Sharma, H.Zushi, I.Takagi, Y.Hisano, T.Shikama, S.Morita, T.Tanabe, N.Yoshida, M.Sakamoto, Y.Higashizono, K.Hanada, M.Hasegawa, O.Mitarai, K.Nakamura, H.Idei, K.N.Sato, S.Kawasaki, H.Nakashima, A.Higashijima, Y.Nakashima, N.Nishino, Y.Hatano, A.Sagara, Y.Nakamura, N.Ashikawa, T.Maekawa, Y.Kishimoto, Y.Takase, QUEST Group
  • Organizer: The 9th International Conference on Tritium Science and Technology (TRITIUM 2010)
  • Place of Presentation: Nara
  • Year and Date: 2010-10-25
• [Presentation] Study of Edge Turbulence from the Open to Closed Magnetic Field Configuration during the Current Ramp-up Phase in QUEST (2010)
  • Author(s): H.Zushi, N.Nishino, the QUEST team
  • Organizer: 23rd IAEA Fusion Energy Conference
  • Place of Presentation: 韓国
  • Year and Date: 2010-10-12
• [Presentation] QUESTにおける非誘導電流駆動時の硬X線計測による高速電子解析 (2010)
  • Author(s): 田島西夜, 図子秀樹, 磯部光孝, 岡村昇一, 出射浩, 花田和明, 長谷川真, 了戒智文, 石黒正貴
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-26
• [Presentation] QUESTプラズマ SOL揺動pdfの高次メーメントの空間構造について (2010)
  • Author(s): 図子秀樹、西野信博、花田和明、長谷川真、石黒正貴、田島西夜、中村一男、藤澤彰英、出射浩、坂本瑞樹、川崎昌二、中島寿年、東島亜紀、江尻晶、高瀬雄一、前川孝、御手洗修、福山敦
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学
  • Year and Date: 2010-09-24
• [Presentation] Steady State Operation of ST Tokamak : QUEST (2010)
  • Author(s): H.Zushi
  • Organizer: The 5th Japan-Korea Seminar on Advanced Diagnostics for Steady-State Fusion Plasma
  • Place of Presentation: 九州大学
  • Year and Date: 2010-08-26
• [Presentation] The role of fast electrons on the non-inductive current ramp-up in QUEST (2010)
  • Author(s): S.Tashima, H.Zushi, M.Isobe, S.Okamura, H.Idei, K.Hanada, S.K.Sharma, T.Ryoukai, M.Ishiguro, H.Liu, the QUEST group
  • Organizer: 37th EPS Conference on Plasma Physics
  • Place of Presentation: Dublin
  • Year and Date: 2010-06-25