Improvement of ECH-driven plasma current startup by control of pitch angles of fast tail electrons

• Project/Area Number: 23360411
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Kyoto University
• Principal Investigator: MAEKAWA Takashi 京都大学, エネルギー科学研究科, 教授 (20127137)
• Co-Investigator(Kenkyū-buntansha): TANAKA Hitoshi 京都大学, エネルギー科学研究科, 准教授 (90183863) ; UCHIDA Masaki 京都大学, エネルギー科学研究科, 助教 (90322164)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000); Fiscal Year 2013: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2012: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2011: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
• Keywords: ECH/ECCD / 電子バーンスタイン波 / 無誘導磁気面形成 / プラズマ電流立ち上げ / 電流立ち上げ / 磁気面形成 / 摂動磁場

Research Abstract

One of issues to realize fusion power plant is reduction of the construction cost. While low aspect ratio torus plasma with a slim center solenoid is promising for cost reduction, non-inductive alternative to start up the plasma current is required. Among various methods of non-inductive start up the ECH/ECCD method is promising since it needs no structure in the vicinity of the plasma. It has been theoretically and experimentally shown that X wave mode-converted upon mirror reflection on the inboard wall from the oblique O wave injected from the lower field side is useful for the start up in large fusion devices. It has been also shown in a small device of the Low Aspect ratio Torus Experiment device that Electron Bernstein waves mode-converted at the upper hybrid resonance layer is useful to start up the plasma current.

Research Products

• [Journal Article] (2013)
  • Author(s): Y.Noguchi, M.Hibino, M.Uchida, H.Tanaka, T.Maekawa
  • Journal Title: Plasma Phys. Control. Fusio Volume: Vol.55 Issue: 12 Pages: 125005-125005
  • DOI: 10.1088/0741-3335/55/12/125005
  • Peer Reviewed
• [Journal Article] Improvement of EC-Driven Spherical Tokamak Discharge by a Radial Magnetic Perturbation on Energetic Trapped Electrons (2012)
  • Author(s): F.Watanabe, M.Uchida, H.Tanaka, T.Maekawa
  • Journal Title: Plasma and Fusion Research Volume: 7 Pages: 1202005-1202005
  • DOI: 10.1585/pfr.7.1202005
  • NAID: 130002059609
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): T.Maekawa, T.Yoshinaga, M.Uchida, F.Watanabe, H.Tanaka
  • Journal Title: Nuclear Fusion Volume: Vol.52
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): K.Kuroda, M.Uchida, H.Tanaka, T.Maekawa
  • Journal Title: Plasma and Fusion Research Volume: Vol.7
  • Peer Reviewed
• [Journal Article] (2012)
  • Author(s): M.Uchida, T.Maekawa, H.Tanaka, F. Watanabe, Y. Noguchi, K. Kuroda, S. Omi,T. Fukunaga, R. Hayashi, T. Kanemitsu, J. Katsuma, H. Mizogami
  • Journal Title: Proc. 24th IAEA Fusion Energy Conf. San Diego
  • Peer Reviewed
• [Journal Article] Noninductive Formation of Spherical Tokamak at 7 Times the Plasma Cutoff Density by Electron Bernstein Wave Heating and Current Drive on LATE (2012)
  • Author(s): Masaki Uchida
  • Journal Title: Proc. 24th IAEA Fusion Energy Conf. San Diego, 2012 (Vienna: IAEA) Volume: EX/P6-18 Pages: 1-8
  • Peer Reviewed
• [Journal Article] (2011)
  • Author(s): T.Maekawa, T.Yoshinaga, H. Tanaka, M.Uchida, F. Watanabe
  • Journal Title: Plasma Science and Technology Volume: Vol.13 Issue: 3 Pages: 342-346
  • DOI: 10.1088/1009-0630/13/3/13
  • Peer Reviewed
• [Journal Article] Generation of initial closed flux surfaces by ECH at a conventional aspect ratio of R/a~ 3 : experiments on the LATE device and JT-60U tokamak (2011)
  • Author(s): M. Uchida, T. Maekawa, H. Tanaka, S. Ide, Y. Takase, F. Watanabe, S. Nishi
  • Journal Title: Nucl. Fusion Volume: Vol.51 Issue: 6 Pages: 63031-63031
  • DOI: 10.1088/0029-5515/51/6/063031
  • Peer Reviewed
• [Presentation] Non-inductive Current Start-up by Electron Cyclotron Heating and Current Drive in KSTAR (2014)
  • Author(s): H.Tanaka, M.Uchida, T.Maekawa, Y-S. Bae, M. Joung, J. H. Jeong
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
• [Presentation] Noninductive formation of an extremely overdense spherical tokamak by electron Bernstein wave heating and current drive on LATE (2014)
  • Author(s): M.Uchida, T.Maekawa, H.Tanaka, Y. Noguchi
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
• [Presentation] Non-inductive Current Start-up by Electron Cyclotron Heating and Current Drive in KSTAR (2014)
  • Author(s): H. Tanaka, M. Uchida, T. Maekawa, Y-S. Bae, M. Joung, J. H. Jeong
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
  • Place of Presentation: Nara Prefectural New Public Hall
• [Presentation] Noninductive formation of an extremely overdense spherical tokamak by electron Bernstein wave heating and current drive on LATE (2014)
  • Author(s): M. Uchida, T. Maekawa, H. Tanaka, Y. Noguchi
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
  • Place of Presentation: Nara Prefectural New Public Hall,
• [Presentation] Fast magnetic activity accompanied with plasma ejection across last closed flux surface in an EC started up plasma in the LATE device (2013)
  • Author(s): T.Maekawa, R.Hayashi, F.Watanabe, H.Tanaka, M.Uchida
  • Organizer: 17th International Spherical Torus Workshop
  • Place of Presentation: York Plasma Institute, York, UK
• [Presentation] Recent Progress in ECH/ECCD Experiments on LATE (2013)
  • Author(s): T.Maekawa
  • Organizer: 9th Asian Plasma and Fusion Association Conference
  • Place of Presentation: Hotel Hilton, Gyeongju City, Korea
• [Presentation] CS-less Tokamak Start-up by ECH/ECCD in KSTAR (2013)
  • Author(s): H.Tanaka
  • Organizer: 9th Asian Plasma and Fusion Association Conference
  • Place of Presentation: Hotel Hilton, Gyeongju City, Korea
• [Presentation] プラズマ波動とモード変換の物理 (2013)
  • Author(s): 前川孝
  • Organizer: 日本物理学会秋の大会
  • Place of Presentation: 徳島大学工学部
• [Presentation] Recent Progress in ECH/ECCD Experiments on LATE (TP-89) (2013)
  • Author(s): T. Maekawa
  • Organizer: 9th Asian Plasma and Fusion Association Conference
  • Place of Presentation: Hotel Hilton, Gyeongju City, Korea
• [Presentation] CS-less Tokamak Start-up by ECH/ECCD in KSTAR (TP-88) (2013)
  • Author(s): H. Tanaka
  • Organizer: 9th Asian Plasma and Fusion Association Conference
  • Place of Presentation: Hotel, Hilton, Gyeongju City, Korea
• [Presentation] プラズマ波動とモード変換の物理 (2013)
  • Author(s): 前川 孝
  • Organizer: 日本物理学会 秋の大会
  • Place of Presentation: 徳島大学工学部
  • Invited
• [Presentation] 磁場を横切る両極性電位 : トロイダルECRプラズマにおける流れの調整役 (2012)
  • Author(s): 前川孝, 黒田賢剛
  • Organizer: プラズマ核融合学会
  • Place of Presentation: クローバープラザ(福岡県春日市)
  • Year and Date: 2012-11-29
• [Presentation] LATE での遮断密度の10 倍の電子密度領域での 球状トカマク形成 (2011)
  • Author(s): 打田正 樹,田中仁, 前川孝, 他10名
  • Organizer: Plasma Conference 2011
  • Place of Presentation: 金沢市石川県立音楽堂
  • Year and Date: 2011-11-22
• [Presentation] 磁場を横切る高速通過電子群による初期磁気面形成 (2011)
  • Author(s): 前川孝, 田中仁, 打田正樹, 渡辺文武, 吉永智一
  • Organizer: Plasma Conference 2011
  • Place of Presentation: 金沢市石川県立音楽堂
  • Year and Date: 2011-11-22
• [Presentation] LATEでの遮断密度の10倍の電子密度領域での球状トカマク形成 (2011)
  • Author(s): 打田正樹, 他12名
  • Organizer: Plasma Conference 2011
  • Place of Presentation: 金沢市石川県立音楽堂
  • Year and Date: 2011-11-22
• [Presentation] Production of High Energy Tail Electrons by Electron Bernstein Waves during the Current Start-up Discharges in the LATE Device (2011)
  • Author(s): H.Tanaka, M.Uchida, F.Watanabe, Y. Noguchi and T.Maekawa
  • Organizer: 19th Topical Conference on Radio Frequency Power in Plasmas
  • Place of Presentation: Newport, Rhode Island, USA
• [Presentation] Initiation of closed flux surfaces and subsequent current ramp-up by ECH/ECCD in the LATE device (2011)
  • Author(s): H.Tanaka, T.Maekawa, M.Uchida, F. Watanabe, Y. Noguchi
  • Organizer: The 8th International Workshop "Strong Microwaves and Terahertz Waves : Sources and Applications"
  • Place of Presentation: Nizhny Novgorod, Russia
• [Presentation] Formation of spherical tokamak at ～10 times the plasma cutoff density by electron Bernstein wave in the LATE device (2011)
  • Author(s): M.Uchida, T.Maekawa, H.Tanaka, F. Watanabe, Y.Noguchi
  • Organizer: 36th EPS Conference on Plasma Physics
  • Place of Presentation: Strasbourg, France
• [Presentation] 磁場を横切る両極性電位： トロイダルＥＣＲプラズマにおける流れの調整役
  • Author(s): 前川孝
  • Organizer: プラズマ核融合学会
  • Place of Presentation: クローバープラザ（福岡県春日市）
• [Remarks] Title: Electron cyclotron wave can startup tokamak
  • URL: http://iopscience.iop.org/0029-5515/labtalk-article/46687
• [Remarks] Electron cyclotron wave can startup tokamak
  • URL: http://iopscience.iop.org/0029-5515/labtalk-article/46687