Study on the electrostatic potential in the formation of closed magnetic configuration

2013 Fiscal Year Final Research Report

• Project/Area Number: 23340174
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plasma science
• Research Institution: Kyoto University
• Principal Investigator: TANAKA Hitoshi 京都大学, エネルギー科学研究科, 准教授 (90183863)
• Co-Investigator(Kenkyū-buntansha): MAEKAWA Takashi 京都大学, 大学院・エネルギー科学研究科, 教授 (20127137) ; UCHIDA Masaki 京都大学, 大学院・エネルギー科学研究科, 助教
• Project Period (FY): 2011-04-01 – 2014-03-31
• Keywords: 磁気再結合 / 閉磁気面形成 / 静電ポテンシャル形成 / 電子サイクロトロン共鳴加熱 / 重イオンビームプローブ / 電位計測

Research Abstract

In the Low Aspect-ratio Torus Experiment (LATE) device, there observed a spontaneous formation of closed configuration of magnetic field when a electron cyclotron (EC) resonance plasma is produced under a weak vertical field superimposed on a toroidal field. A heavy ion beam probe (HIBP) system has been developed to measure the electrostatic potential which may play an important role on the transition of the magnetic topology. It is observed at the first time that the electrostatic potential is negative at -20 ~ -30V on the midplane near the EC resonance layer when the closed magnetic field configuration is formed. The result is completely different from the open field configuration case where the electrostatic potential is positive in the entire region. This result suggests that the electrostatic potential changes drastically through the transition from the open field configuration to the closed one.

Research Products

• [Journal Article] Development of an Ion Beam Probe System for Potential Measurement in the Low Aspect-Ratio Torus Experiment Device (2012)
  • Author(s): H.Tanaka, S.Omi, J.Katsuma, Y.Yamamoto, M.Uchida, T.Maekawa, H.Iguchi
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: Vol.132 No.7 Pages: 567-573
• [Presentation] LATEプラズマにおけるイオンビームプローブによる空間電位計測の試み (2013)
  • Author(s): 重村樹, 田中仁, 打田正樹, 前川孝, 井口春和
  • Organizer: プラズマ・核融合学会第30回年会
  • Place of Presentation: 東京工業大学,東京都目黒区
  • Year and Date: 2013-12-05
• [Presentation] LATEプラズマの電位計測用イオンビームプローブの開発 : エネルギー分析 (2012)
  • Author(s): 田中仁, 勝間淳, 重村樹, 打田正 樹,前川孝, 井口春和
  • Organizer: プラズマ・核融合学会第29回年会
  • Place of Presentation: クローバープラザ,福岡県春日市
  • Year and Date: 2012-11-30
• [Presentation] LATEプラズマの電位計測用イオンビームプローブの開発 : 電位計測位置の設定と制御 (2012)
  • Author(s): 勝間淳, 田中仁, 重村樹, 打田正樹, 前川孝, 井口春和
  • Organizer: プラズマ・核融合学会第29回年会
  • Place of Presentation: クローバープラザ,福岡県春日市
  • Year and Date: 2012-11-30
• [Presentation] Development of ion beam probe for the LATE plasma (2011)
  • Author(s): S . Omi , H . Tanaka , J . Katsuma , T.Kanemitsu, R.Hayashi, T.Fukunaga, H.Mizogami, Y.Noguchi, F.Watanabe, M.Uchida, T.Maekawa, H.Iguchi
  • Organizer: Plasma Conference 2011
  • Place of Presentation: 石川県立音楽堂,石川県金沢市
  • Year and Date: 2011-11-22
• [Presentation] Ion beam probe system for potential measurement in the Low Aspect-Ratio Torus Experiment device (2011)
  • Author(s): H . Tanaka , S. Om i , J . Katsuma , M.Uchida, T.Maekawa, H.Iguchi
  • Organizer: 16th International Workshop on Spherical Torus
  • Place of Presentation: 核融合科学研究所,岐阜県土岐市
  • Year and Date: 2011-09-28
  • Invited
• [Presentation] Preliminary Result of Space Potential Measurement by a Heavy Ion Beam Probe in LATE
  • Author(s): T.Shigemura, H.Tanaka, M.Uchida, T.Maekawa, H.Iguchi
  • Organizer: The Second A3 Foresight Workshop on Spherical Torus
  • Place of Presentation: Tsinghua University, Beijing, China
• [Remarks]
  • URL: http://plasma47.energy.kyoto-u.ac.jp/index.html