Optimization of spherical tokamak merging start-up by using outer poloidal field coils

2010 Fiscal Year Final Research Report

• Project/Area Number: 21760688
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Nuclear fusion studies
• Research Institution: The University of Tokyo
• Principal Investigator: YAMADA Takuma 東京大学, 大学院・新領域創成科学研究科, 助教 (90437773)
• Project Period (FY): 2009 – 2010
• Keywords: 炉心プラズマ

Research Abstract

On UTST, spherical tokamak start-up was demonstrated by merging two initial plasmas, which were generated inside the vessel by using the magnetic field coils located outside the vessel. To optimize the discharge, toroidal field was enhanced and equilibrium field was generated by electric double layer capacitors and IGBTs. Doppler spectroscopy measured the acceleration of the ions in the outflow region, and triple Langmuir probe measured the localized electron heating at the merging X-point.

Research Products

• [Journal Article] Magnetic Helicity Injection Mechanism for Double-Null Startup of the UTST Spherical Tokamak Plasmas (2011)
  • Author(s): T. G. Watanabe, Y. Ono, T. Yamada, S. Kamio, Q. H. Cao, N. Suzuki, K. Ishiguchi and M. Inomoto
  • Journal Title: Plasma Fusion Res. Volume: 6 Pages: 1202131
  • Peer Reviewed
• [Journal Article] Multipoint Spectroscopy of Spherical Tokamak Heating by Magnetic Reconnection in UTST (2011)
  • Author(s): S. Kamio, Q. H. Cao, K. Abe, M. Sakumura, N. Suzuki, T. G. Watanabe, K. Ishiguchi, R. Imazawa, T. Yamada, M. Inomoto, Y. Takase and Y. Ono
  • Journal Title: Plasma Fusion Res. Volume: 6 Pages: 2402033
  • Peer Reviewed
• [Journal Article] UTSTにおける外部コイルを用いた球状トカマク合体実験 (2011)
  • Author(s): 山田琢磨
  • Journal Title: 日本物理学会第66回年次大会講演資料 Pages: 27pGY-4
• [Journal Article] Development of effective power supply using electric double layer capacitor for static magnetic field coils in fusion plasma experiments (2011)
  • Author(s): M. Inomoto, K. Abe, T. Yamada, A. Kuwahata, S. Kamio, Q. H. Cao, M. Sakumura, N. Suzuki, T. Watanabe and Y. Ono
  • Journal Title: Rev. Sci. Instrum. Volume: 82 Pages: 033503
  • Peer Reviewed
• [Journal Article] 電気二重層キャパシタのパルスコイル電源への応用 (2011)
  • Author(s): 阿部圭太, 井通暁, 山田琢磨, 桑波田晃弘, 神尾修治, 作村守央, 曹慶紅, 今澤良太, 小野靖
  • Journal Title: 電学論A Volume: 131 Pages: 55-56
  • Peer Reviewed
• [Journal Article] Observation of Quasi-Two-Dimensional Nonlinear Interaction in a Drift-Wave Streamer (2010)
  • Author(s): T. Yamada, S.-I. Itoh, S. Inagaki, Y. Nagashima, N. Kasuya, K. Kamataki, H. Arakawa, T. Kobayashi, M. Yagi, A. Fujisawa and K. Itoh
  • Journal Title: Phys. Rev. Lett. Volume: 105 Pages: 225002
  • Peer Reviewed
• [Journal Article] Study of Amplitude Correlation Technique in a Cylindrical Magnetized Plasma (2010)
  • Author(s): T. Yamada, S.-I. Itoh, S. Inagaki, Y. Nagashima, K. Kamataki, H. Arakawa, M. Yagi, A. Fujisawa and K. Itoh
  • Journal Title: J. Phys. Soc. Jpn. Volume: 79 Pages: 085001
  • Peer Reviewed
• [Journal Article] Merging Startup Experiments on the UTST Spherical Tokamak (2010)
  • Author(s): T. Yamada, R. Imazawa, S. Kamio, R. Hihara, K. Abe, M. Sakumura, Q. H. Cao, T. Oosako, H. Kobayashi, T. Wakatsuki, B. I. An, Y. Nagashima, H. Sakakita, H. Koguchi, S. Kiyama, Y. Hirano, M. Inomoto, A. Ejiri, Y. Takase and Y. Ono
  • Journal Title: Plasma Fusion Res. Volume: 5 Pages: S2100
  • Peer Reviewed
• [Journal Article] Nonlinear Mode Couplings in a Cylindrical Magnetized Plasma (2010)
  • Author(s): T. Yamada, S.-I. Itoh, S. Inagaki, Y. Nagashima, S. Shinohara, N. Kasuya, K. Terasaka, K. Kamataki, H. Arakawa, M. Yagi, A. Fujisawa and K. Itoh
  • Journal Title: Plasma Fusion Res. Volume: 5 Pages: S2016
  • Peer Reviewed
• [Journal Article] Two-dimensional bispectral analysis of drift wave turbulence in a cylindrical plasma (2010)
  • Author(s): T. Yamada, S.-I. Itoh, S. Inagaki, Y. Nagashima, S. Shinohara, N. Kasuya, K. Terasaka, K. Kamataki, H. Arakawa, M. Yagi, A. Fujisawa and K. Itoh
  • Journal Title: Phys. Plasmas Volume: 17 Pages: 052313
  • Peer Reviewed
• [Presentation] Merging startup experiments in UTST and MAST (2011)
  • Author(s): T. Yamada
  • Organizer: Joint Meeting of the 5th IAEA Technical Meeting on Spherical Tori and the 16th International Workshop on Spherical Torus
  • Place of Presentation: NIFS, Toki, Japan
  • Year and Date: 2011-09-29
• [Presentation] Experimental investigation of streamers (2011)
  • Author(s): T. Yamada
  • Organizer: Workshop on Electric Fields, Turbulence and Self-Organisation in Magnetized Plasmas 2011
  • Place of Presentation: Strasbourg, France
  • Year and Date: 2011-07-04
• [Presentation] Observation of a streamer in drift wave turbulence (2011)
  • Author(s): T. Yamada
  • Organizer: 1st Asia Pacific Transport Working Group International Conference
  • Place of Presentation: NIFS, Toki, Japan
  • Year and Date: 2011-06-14
• [Presentation] Magnetic reconnections studies on MAST (2010)
  • Author(s): T. Yamada
  • Organizer: US-Japan Workshop on Magnetic Reconnection 2010
  • Place of Presentation: Hotel Nikko Nara, Nara, Japan
  • Year and Date: 2010-12-07
• [Presentation] Double null merging start-up experiments on UTST (2010)
  • Author(s): T. Yamada
  • Organizer: 52nd Annual Meeting of the American Physical Society Division of Plasma Physics
  • Place of Presentation: Chicago, USA
  • Year and Date: 2010-11-08
• [Presentation] Double Null Merging Start-up Experiments in the University of Tokyo Spherical Tokamak (2010)
  • Author(s): T. Yamada
  • Organizer: 23rd IAEA Fusion Energy Conference
  • Place of Presentation: Daejeon, Rep. of Korea
  • Year and Date: 2010-10-12
• [Presentation] Merging Start-up and Sustainment Experiments on the UTST Spherical Tokamak (2009)
  • Author(s): T. Yamada
  • Organizer: 19th International Toki Conference
  • Place of Presentation: Ceratopia Toki, Toki, Japan
  • Year and Date: 2009-12-09
• [Presentation] Nonlinear mode couplings in a cylindrical magnetized plasma (2009)
  • Author(s): T. Yamada
  • Organizer: 19th International Toki Conference
  • Place of Presentation: Ceratopia Toki, Toki, Japan
  • Year and Date: 2009-12-08
• [Presentation] UTST実験における球状トカマクの合体立ち上げと維持 (2009)
  • Author(s): 山田琢磨
  • Organizer: プラズマ・核融合学会第26回年会
  • Place of Presentation: 京都市国際交流会館, 京都
  • Year and Date: 2009-12-04
• [Presentation] Spherical tokamak start-up and sustainment experiments on UTST (2009)
  • Author(s): T. Yamada
  • Organizer: 51st Annual Meeting of the American Physical Society Division of Plasma Physics
  • Place of Presentation: Atlanta, USA
  • Year and Date: 2009-11-04
• [Presentation] Merging Start-up and Sustainment Experiments on UTST (2009)
  • Author(s): T. Yamada
  • Organizer: International Spherical Torus Workshop 2009
  • Place of Presentation: Madison, USA
  • Year and Date: 2009-10-22