Improvement of electron Bernstein wave heating in LHD

• Project/Area Number: 24561029
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: YOSHIMURA Yasuo 核融合科学研究所, ヘリカル研究部, 准教授 (90300730)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: 電子サイクロトロン波 / 電子バーンシュタイン波 / モード変換 / 高密度プラズマ / プラズマ加熱 / カットオフ / 定常プラズマ / プラズマ / LHD / 加熱 / 定常実験 / インターロック / SSO / ECH / EBW / overdense / slow XB / X-B / 遮断密度

Outline of Final Research Achievements

Heating plasmas with the electron density higher than the cut-off density of electron cyclotron (EC) heating waves was realized, by enabling the injection of EC-waves from high magnetic field side so that the EC waves are mode-converted to the electron Bernstein waves.
An interlock system which prevent the possible damage of LHD vacuum vessel caused by non-absorbed high power EC-waves was constructed. The interlock system greatly contributed to the progress of steady state plasma sustainment by EC-waves. In 2014, a high performance plasma with the line average electron density of 1.1×1019 m－3 and the central electron temperature of over 2.5keV was stably sustained by 350kW EC-wave for 39 min.

Research Products

• [Journal Article] Long-pulse Plasma Discharges by Upgraded ECH System in the LHD (2015)
  • Author(s): Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, N. Ashikawa, Y. Ueda, S. Ito, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, Y. Mizuno, K. Okada, S. Ogasawara, R. Makino, I. Yamada, T. Tokuzawa, K. Tanaka, T. Mutoh, H. Yamada, and LHD Experiment Group
  • Journal Title: European Physical Journal Web of Conferences Volume: 87 Pages: 02020-02020
  • DOI: 10.1051/epjconf/20158702020
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD (2013)
  • Author(s): Y. Yoshimura, H. Igami, S. Kubo, T. Shimozuma, H. Takahashi, M. Nishiura, S. Ohdachi, K. Tanaka, K. Ida, M. Yoshinuma, C. Suzuki, S. Ogasawara, R. Makino, H. Idei, R. Kumazawa, T. Muto, H. Yamada
  • Journal Title: Nuclear Fusion Volume: 53 Issue: 6 Pages: 63004-63004
  • DOI: 10.1088/0029-5515/53/6/063004
  • Peer Reviewed
• [Journal Article] High Density Plasma Heating by EC-Waves Injected from High-Field Side for Mode Conversion to Electron Bernstein Waves in LHD (2013)
  • Author(s): Y. Yoshimura, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Ogasawara, R. Makino, T. Mutoh, H. Yamada, A. Komori
  • Journal Title: Plasma Science and Technology Volume: 15 Issue: 2 Pages: 93-96
  • DOI: 10.1088/1009-0630/15/2/02
  • Peer Reviewed
• [Journal Article] Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD (2013)
  • Author(s): Y. Yoshimura, H. Igami, S. Kubo, T. Shimozuma, H. Takahashi, M. Nishiura, S. Ohdachi, K. Tanaka, K. Ida, M. Yoshinuma, C. Suzuki, S. Ogasawara, R. Makino, H. Idei, R. Kumazawa et al.
  • Journal Title: NUCLEAR FUSION Volume: 53
  • Peer Reviewed
• [Journal Article] ECCD Experiment Using an Upgraded ECH System on LHD (2012)
  • Author(s): Y. Yoshimura, 他
  • Journal Title: Plasma and Fusion Research Volume: 7 Issue: 0 Pages: 2402020-2402020
  • DOI: 10.1585/pfr.7.2402020
  • NAID: 130003366257
  • ISSN: 1880-6821
  • Peer Reviewed
• [Presentation] Progress of Long Pulse Discharges by ECH in LHD (2015)
  • Author(s): 吉村泰夫
  • Organizer: 8th Technical Meeting on Steady State Operation of Magnetic Fusion Devices
  • Place of Presentation: 奈良春日野国際フォーラム 甍
  • Year and Date: 2015-05-26 – 2015-05-29
• [Presentation] Progress in High Performance Steady State Plasma Operation in LHD (2014)
  • Author(s): 吉村泰夫
  • Organizer: Plasma Conference 2014
  • Place of Presentation: 新潟コンベンションセンター 朱鷺メッセ
  • Year and Date: 2014-11-18 – 2014-11-21
  • Invited
• [Presentation] Long-Pulse Plasma Discharges by Upgraded ECRH System in LHD (2014)
  • Author(s): 吉村泰夫
  • Organizer: 18th Joint Workshop on ECE and ECRH
  • Place of Presentation: 奈良県新公会堂
  • Year and Date: 2014-04-22 – 2014-04-25
• [Presentation] Long-Pulse Plasma Discharges by Upgraded ECRH System in LHD (2014)
  • Author(s): Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, N. Ashikawa, Y. Uede, S. Ito, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, Y. Mizuno, K. Okada, S. Ogasawara, R. Makino, I. Yamada, C. Suzuki, K. Tanaka, T. Mutoh, H. Yamada
  • Organizer: 18th Joint Workshop on ECE and ECRH
  • Place of Presentation: 奈良県 奈良市
• [Presentation] LHDにおける高性能プラズマ定常維持実験の進展 (2014)
  • Author(s): 吉村泰夫
  • Organizer: Plasma Conference 2014
  • Place of Presentation: 新潟県 新潟市
  • Invited
• [Presentation] Progress in long-pulse plasma sustainment and high-density plasma heating by upgraded ECRH system in LHD (2013)
  • Author(s): Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, et al.
  • Organizer: Joint 19th ISHW and 16th IEA-RFP workshop
  • Place of Presentation: イタリア パドバ
• [Presentation] Long-pulse plasma sustainment and high-density plasma heating by use of electron cyclotron waves in LHD (2013)
  • Author(s): Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, et al.
  • Organizer: The 4th International Symposium of Advanced Energy Science
  • Place of Presentation: 京都府 宇治市
  • Invited
• [Presentation] ECRH system update in LHD (2012)
  • Author(s): Y. Yoshimura, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, S. Ito, Y. Mizuno, K. Okada, S. Ogasawara, R. Makino, T. Mutoh, T. Kariya, R. Minami, T. Imai et al.
  • Organizer: 高周波加熱物理と技術に関する日米欧合同ワークショップ
  • Place of Presentation: 奈良県奈良市
• [Presentation] Electron Bernstein Wave Heating and Electron Cyclotron Current Drive by Use of Upgraded ECH System in LHD (2012)
  • Author(s): Y. Yoshimura, H. Igami, S. Kubo, T. Shimozuma, H. Takahashi, M. Nishiura, S. Ohdachi, S. Sakakibara, G. Motojima, K. Tanaka, K. Ida, M. Yoshinuma, C. Suzuki, S. Ogasawara, R. Makino et al.
  • Organizer: 24th IAEA Fusion Energy Conference
  • Place of Presentation: San Diego, USA