Experimental evaluation of bulk-ion heating by energetic particle driven instabilities

• Project/Area Number: 24656561
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: OSAKABE Masaki 核融合科学研究所, ヘリカル研究部, 教授 (90280601)
• Co-Investigator(Kenkyū-buntansha): IDO Takeshi 核融合科学研究所, へリカル研究部, 准教 授 (50332185) ; TOKUZAWA Tokihiko 核融合科学研究所, へリカル研究部, 准教 授 (90311208) ; SHIMIZU Akihiro 核融合科学研究所, へリカル研究部, 助教 (00390633)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: GAM / 高速イオン励起不安定性 / イオン異常加熱 / αチャンネリング / fast ion / alpha channeling

Research Abstract

On the Large Helical Device, the excitation of energetic particle driven instability, whose toroidal mode number is zero, and the increase in ion temperature being associated with the activity of the instabilities is observed when energetic particle beams are injected to very low density micro-wave sustained plasmas. From a theoretical analysis based on experimental observation, the instability was evaluated to be Geodesic Acoustic Mode (GAM). From the correlation analysis between the activity of the mode and the ion temperature behaviors, it was concluded the anomalous heating of bulk-ions is the most probable mechanism to explain the increase in the ion temperatures.

Research Products

• [Journal Article] Identification of Energetic-particle Driven Geodesic Acoustic Mode in the LHD Plasmas (2013)
  • Author(s): T.Ido, M. Osakabe, A.Shimizu, M.Nishiura, T.Watari, K.Toi, Y.Yoshimura, and S.Kato
  • Journal Title: Annual Report of National Institute for Fusion Science Volume: April 2012-March 2013 Pages: 104-104
• [Journal Article] Observation of Clump and Hole Formation in the Energetic-ion Spectra by GAM Burst Activities (2013)
  • Author(s): M.Osakabe, T.Ido, K.Toi, A.Shimizu, T.Tokuzawa, K.Ogawa, M.Isobe and LHD experiment group
  • Journal Title: Annual Report of National Institute for Fusion Science Volume: April 2012-March 2013 Pages: 128-128
• [Presentation] Large electrostatic potential fluctuation associated with energetic-particle driven geodesic acoustic mode in LHD (2013)
  • Author(s): T. Ido, A. Shimizu, M. Osakabe, 他
  • Organizer: 23rd International Toki Conference
  • Place of Presentation: Toki (Japan)
  • Year and Date: 2013-11-18
• [Presentation] Indication of anomalous ion-heating associated with energetic particle driven Geodesic Acoustic Mode(GAM) on LHD (2013)
  • Author(s): M.Osakabe, T.Ido, K.Ogawa, A.Shimizu, 他
  • Organizer: 13^<th> IAEA Technical Meeting on Energetic Particle
  • Place of Presentation: Beijing (China)
• [Presentation] Characteristics of EGAM and influence on ion energy spectra in the LHD plasmas (2013)
  • Author(s): T. Ido, M. Osakabe, A. Shimizu, 他
  • Organizer: 3rd Asia Pacific Transport Working Group International Conference
  • Place of Presentation: Jeju (Korea)
• [Presentation] Measurement of ion mass density by GAM spectroscopy (2013)
  • Author(s): T. Tokuzawa, S. Inagaki, K. Itoh, S.-I. Itoh, K. Ida, T. Ido, A. Shimizu, A. Fujisawa, H. Yamada, K. Toi, K. Ogawa, M. Isobe, M. Osakabe, 他
  • Organizer: 3rd Asia Pacific Transport Working Group International Conference
  • Place of Presentation: Jeju (Korea)
• [Presentation] Indication of anomalous ion-heating associated with energetic particle driven Geodesic Acoustic Mode(GAM) on LHD (2013)
  • Author(s): M.Osakabe, T.Ido, K.Ogawa, A.Shimizu, M.Yokoyama, M.Isobe, K.Toi, S.Kubo, D.A.Spong, K.Nagaoka, Y.Takeiri and LHD-group
  • Organizer: 高エネルギー粒子に関わるIAEA技術専門家会合
  • Place of Presentation: Beijin,China
  • Invited
• [Presentation] Characteristics of EGAM and influence on ion energy spectra in the LHD plasmas (2013)
  • Author(s): T. Ido, M. Osakabe, A. Shimizu, M. Nishiura, T. Itoh, T. Watari, K.Itoh, Y. Yoshimura, K. Toi, K. Ogawa, S. Satake, and the LHD experiment group
  • Organizer: 3rd Asia Pacific Transport Working Group International Conference
  • Place of Presentation: Jeju, Korea
• [Presentation] Large electrostatic potential fluctuation associated with energetic-particle driven geodesic acoustic mode in LHD (2013)
  • Author(s): T. Ido, A. Shimizu, M. Osakabe, M. Nishiura, M. Kurachi, S. Kato, S.Satake, K. Itoh, T. Watari, and LHD experiment group
  • Organizer: 23rd International Toki Conference
  • Place of Presentation: Toki, Japan
• [Presentation] Measurement of ion mass density by GAM spectroscopy (2013)
  • Author(s): T. Tokuzawa, S. Inagaki, K. Itoh, S.-I. Itoh, K. Ida, T. Ido, A. Shimizu, A. Fujisawa, H. Yamada, K. Toi, K. Ogawa, M. Isobe, M. Osakabe, K. Tanaka, I. Yamada, S. Morita, M. Goto, S. Sakakibara, Y. Nagayama a, K. Kawahata, and LHD Experiment Group
  • Organizer: 3rd Asia Pacific Transport Working Group (APTWG) International conference
  • Place of Presentation: Jeju, Korea
• [Presentation] Interaction between energetic particle driven n=0 mode and bulk-ions on LHD (2012)
  • Author(s): 長壁正樹、井戸毅、他
  • Organizer: プラズマ核融合学会年会
  • Place of Presentation: クローバープラザ（福岡県・春日市）
• [Presentation] Observation of a new energy channel from energetic particles to bulk ions through geodesic acoustic mode (2012)
  • Author(s): 井戸毅、長壁正樹、他
  • Organizer: IAEA Fusion Energy Conference 2012
  • Place of Presentation: ヒルトン(米国・カリフォルニア・サンディエゴ）