Study of edge MHD instabilities in torus plasmas using fast soft X-ray camera

2008 Fiscal Year Final Research Report

• Project/Area Number: 17360446
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: OHDACHI Satoshi National Institute for Fusion Science, 大型ヘリカル研究部, 准教授 (00270489)
• Co-Investigator(Kenkyū-buntansha): TOI Kazuo 核融合科学研究所, 大型ヘリカル研究部, 教授 (20093057) ; SAKAKIBARA Satoru 核融合科学研究所, 大型ヘリカル研究部, 准教授 (90280594) ; TAKECHI Manabu 日本原子力研究開発機構, 核融合研究開発部門 先進プラズマ研究開発ユニット, 研究員 (40370423)
• Project Period (FY): 2005 – 2008
• Keywords: 核融合 / MHD 不安定性 / イメージング計測 / X 線分光

Research Abstract

環状の磁場閉じ込め装置の周辺プラズマの揺動の空間構造を検出する新しいタイプの計測器の開発した。多層膜反射鏡を使った軟X 線領域の反射望遠鏡タイプの計測器を構築し、揺動計測に十分なフレーミングレートでの計測に成功している。大型ヘリカル装置での初期計測では、周辺MHD 揺動に対応する磁力線に平行なモード構造の検出に成功しており、今後、解析プログラムの整備を行って詳細なモードの空間構造とその発展についての研究を行う。

Research Products

• [Journal Article] Development of a High Speed VUV Camera System for2-Dimensional Imaging of Turbulent Structure in LHD (2008)
  • Author(s): M. Takeuchi, S.Ohdachi, et.al
  • Journal Title: Proceeding of 18th International Toki conference 2008 Pages: 2-28
• [Journal Article] MHD study of the reactor-relevant high-beta regime in the Large Helical Device (2008)
  • Author(s): S. Sakakibara, S. Ohdachi, .et. Al.
  • Journal Title: Plasma Phys. Control. Fusion 50, 124014 Pages: 10
• [Journal Article] Tangential SX Imaging for Visualization of Fluctuations in Toroidal Plasmas (2007)
  • Author(s): S. Ohdachi, K. Toi ,et al.
  • Journal Title: Plasma and Fusion Research 2, S1010 Pages: 1-6
• [Journal Article] Soft and Ultra-soft X-ray Detector Array System for Measurement of Edge MHD modes in the Large Helical Device (2007)
  • Author(s): F. Watanabe, K. Toi, S. Ohdachi, et al.
  • Journal Title: Plasma and Fusion Research 2, S1066 Pages: 1-4
• [Journal Article] wo-Dimensional Measurement of Electron Density Profile in the Edge Region of the Large Helical Device Plasma by a Sheet-Shaped Thermal Lithium Beam (2006)
  • Author(s): Y. Takahashi, K. Toi, S. Ohdachi, et.al.
  • Journal Title: Plasma and Fusion Research 1, 013
• [Journal Article] Radial structure of edge MHD modes in LHD plasmaswith L-H transition (2006)
  • Author(s): F. Watanabe, K. Toi, S. Ohdachi, , et.al.
  • Journal Title: Plasma Phys. Control. Fusion 48, A201
• [Journal Article] Effects of Resonant Magnetic Fluctuations on Plasma Confinementin Current Carrying high-β Plasmas of LHD (2006)
  • Author(s): S. Sakakibara, S. Ohdachi, et. Al.
  • Journal Title: Plasma and Fusion Research 1, 003-1
• [Journal Article] Onset of Resistive Interchange Mode in the Large Helical Device (2006)
  • Author(s): S. Sakakibara, S. Ohdachi , et.al.
  • Journal Title: Plasma and Fusion Research 1, 049-1
• [Journal Article] プラズマ計測のためのトモグラフィー解析法 (2006)
  • Author(s): 岩間尚文、大舘暁
  • Journal Title: 核融合学会誌 82, 399
• [Journal Article] Magnetic Islands Observed by a Fast-Framing Tangentially Viewing Soft X-ray Camera on LHD and textor (2006)
  • Author(s): S. Ohdachi, K. Toi, G. Fuchs, TEXTOR TEAMand LHD experimental Team
  • Journal Title: Plasma Science & Technology 8, 45
• [Journal Article] LHD experimental Group Formation of Edge Trasport Barriers by L-H transition and Large Reversed Plasma Current on LHD (2006)
  • Author(s): K. Toi, S. Ohdachi, F. Watanabe, K. Narihara, T. Morisaki, Gao Xiang, M. Goto, K. Ida, S. Masuzaki, K. Miyazawa, S. Morita, S. Sakakibara, K. tanaka, T. Tokuzawa, K. W, Watanabe, Yan Longwen, M. Yoshimura
  • Journal Title: Plasma Science & Technology 8, 5
• [Journal Article] Observation of Internal Structure of Edge MHD Modes in High Beta Plasmas on the Large Helical Device (2005)
  • Author(s): WATANABE Fumitake, OHDACHI Satoshi, TAKAGI Shohji, TOI Kazuo, SAKAKIBARA Satoru, WATANABE Kiyomasa, MORITA Shigeru
  • Journal Title: J. Plasma Fusion Res. 81, 967
• [Journal Article] Observation of the low to high confinement transition in the large helical device (2005)
  • Author(s): K. Toi and S. Ohdachi S. Yamamoto S. Sakakibara, K. Narihara, K. Tanaka, S. Morita, T. Morisaki, M. Goto, and S. Takagi F. Watanabe N. Nakajima, K. Y. Watanabe, K. Ida, K. Ikeda, S. Inagaki, O. Kaneko, K. Kawahata, A. Komori, S. Masuzaki, K. Matsuoka, J. Miyazawa, K. Nagaoka, Y. Nagayama, Y. Oka, M. Osakabe, N. Ohyabu, Y. Takeiri, T. Tokuzawa, K. Tsumori, H. Yamada, I. Yamada, K. Yoshinuma, and LHD Experimental Group
  • Journal Title: Phys. Plasma 12, 020701
• [Journal Article] Effects of global MHD instability onoperational high beta-regime in LHD (2005)
  • Author(s): K.Y.Watanabe, S. Sakakibara, Y. Narushima, H. Funaba, K. Narihara, K. Tanaka, T. Yamaguchi, K. Toi, S. Ohdachi, O. Kaneko, H. Yamada, Y. Suzuki, W.A. Cooper, S. Murakami, N. Nakajima, I. Yamada, K. Kawahata, T. Tokuzawa, A. Komori and LHD experimental group
  • Journal Title: Nuclear Fusion 45 Pages: 1247-1254
• [Presentation] LHD における高密度放電で観測されるMHD 不安定性 (2009)
  • Author(s): 大舘暁, 他
  • Organizer: 第64回日本物理学会年次大会
  • Place of Presentation: 立教大学
  • Year and Date: 2009-03-28
• [Presentation] Two approaches to the reactor-relevant high-beta plasmas with profile control in the Large Helical Device (2008)
  • Author(s): S. Ohdachi, et.al.
  • Organizer: 22nd Fusion Energy Conference(Geneve)
  • Place of Presentation: ジュネーブ(スイス)
  • Year and Date: 20081013-19
• [Presentation] LHD における高中心プラズマ (2008)
  • Author(s): 大舘暁, 他
  • Organizer: 第7回核融合エネルギー連合講演会
  • Place of Presentation: 青森市男女参画プラザAV 多機能ホール
  • Year and Date: 2008-06-09
• [Presentation] LHD におけるIDB プラズマの密度崩壊現象 (2007)
  • Author(s): 大舘暁、東井和夫、榊原悟, 他
  • Organizer: 核融合学会
  • Place of Presentation: 姫路
  • Year and Date: 2007-11-29
• [Presentation] SX imaging for visualization of Tangential SX imaging for visualization of fluctuations in toroidal plasmas fluctuations in toroidal plasmas (2006)
  • Author(s): S. Ohdachi, et.al, Tangential
  • Organizer: 16th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion
  • Place of Presentation: 土岐市
  • Year and Date: 20061205-08
• [Presentation] Two-Dimensional Structure of MHD Instabilities and their Non-Linear Evolution in the Large Helical Device (2006)
  • Author(s): S.Ohdachi, et.al.
  • Organizer: 21th Fusion Energy Conference
  • Place of Presentation: 成都(中 国)
  • Year and Date: 20061016-21