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Experimental investigation of quasi-steady current driving for spheromak plasmas by means of magnetic helicity injection.

Research Project

Project/Area Number 02452135
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 電力工学
Research InstitutionTHE UNIVERSITY OF TOKYO

Principal Investigator

KATSURAI Makoto  Univ.Tokyo, Dept.Electrical Engrn., Professor, 工学部, 教授 (70011103)

Co-Investigator(Kenkyū-buntansha) ITAGAKI Toshifumi  Univ.Tokyo, Dept.Electrical Engrn., Assistant, 工学部, 助手
ONO Yasushi  Univ.Tokyo, Dept.Electrical Engrn., Associate Professor, 工学部, 助教授 (30214191)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1992: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1990: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsNuclear fusion research / Plasma science / Magnetic confinement / Toroidal confinement / Compact toroids / Spheromak plasmas / Current driving / Magnetic Helicity / 磁気プラズマ閉じ込め / フフェロマック / 可視光トモグラフィー / トカマク / コンパクトト-ラス / 磁気ヘリシティ- / 可視光トモグラフィ- / コンパクト・ト-ラス / 磁気リコネクション / 磁力線再結合
Research Abstract

External drive of the plasma current of spheromak plasmas has been performed to demonstrate the feasibility of sustaining their magnetic configurations by the magnetic helicity injection method. The both of the conductive type and the inductive type of the helicity injection have been examined in the Tokyo University spheromak machine TS-3. Under appropriate current driving conditions. the spheromak configuration is maintained three to five times longer than non-driving conditions. A visible light computer tomography system has been developed to observe unstable plasma motions in the pasmas. In this measurement, the time evolutions of two dimensional emission profile of visible light on the mid-plane of plasmas have been observed by a newly developed three-direction ten-channel computer tomography system. This system can reconstruct the emission profile by the Cormack method based on the Fourier-Bessel-Neumann expansions. From reconstructed images, the relaxation is found to be caused by the inverse-cascade phenomena, in which instabilities with higher toroidal mode numbers are excited first, followed by the energy transmission to those with lower mode numbers. Magnetic measurements have also been performed and the flux conversion from poloidal to toroidal associated with the inverse-cascade phenomena is observed. Three dimensional magnetohydrodynamic computer simulations have also been carried out to examine the dynamic behaviors of the spheromak configuration in helicity injection periods. It is found that a magnetic relaxation cycle, consisting of the current peaking phase and the subsequent MHD relaxation phase, plays very important roles in the magnetic flux conversion from poloidal to toroidal. The nonlinear coupling of the current driven MHD instabilities with mode numbers of n=2 and n=3 takes place in the flux conversion. These findings are qualitatively consistent with the tomographic observations of the MHD activities.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] 森田,小野,桂井: "トロイダル電流駆動方式磁気ヘリシティー注入法によるコンパクトトーラスプラズマの長時間配位維持実験" 電気学会誌. (投稿予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Amemiya, A.Morita, M.Katsurai: "Experiments of Axial Compression of Flux-Core Spherowak" J.P.S.J.62. 1552-1561 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 森田,早川,桂井: "回転楕円体容器中におけるフラックスコアースフェロマックの平衡配位" 電気学会論文誌A. 112-A. 706- (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Ono, M.Katsurai: "Three-Dimensional Numerical Simulation of the Multi-Helicity Magnetohydrodynamic Relaxation Process in Low-q Spheromaks" Nuclear Fusion. 31. 233-244 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Amemiya,A.Hayakawa,M.Katsurai: "Formation of Free-Boundary Flux-Core Spheromaks" J.P.S.J.60. 2632-2644 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 桂井,雨宮,早川: "円筒容器内フラックスコアースフェロマックの平衡解とその特性" 核融合研究. 64. 262-275 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Morita, Y.Ono, M.Katsurai: "Experiments of long pulse operation of compact torus plasmas by means of magnetic helicity injection through toroidal current driving" Trans.I.E.E.Japan. (to be submitted.).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Amemiya, A.Morita, M.Katsurai: "Experiments of axial compression of flux-core spheromak" J.P.S.J.62-5. 1552 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] A.Morita, A.Hayakawa, M.Katsurai: "Equilibrium analysis of flux-core spheromaks in a spheroidal conductive vessel" Trans.I.E.E.Japan. 112A-8. 706 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.Ono, M.Katsurai: "Three-dimensional numerical simulation of the multi-helicity magnetohydrodynamic relaxation process in low-q spheromaks" Nuclear Fusion. 31-2. 233 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Amemiya, H.Hayakawa, M.Katsurai: "Formation of free-boundary flux-core spheromaks" J.P.S.J.60-8. 2632 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.Katsurai, N.Amemiya, A.Hayakawa: "Equilibrium studies on the magnetic configuration of flux-core spheromaks in a finite-length cylindrical vessel" J.Plasma and Fusion Res.64-4. 262 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 森田,早川,桂井: "回転楕円体導体容器中におけるフラックスコア-スフェロマックの平衡配位" 電気学会論文誌. 112-A. 706-712 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] S.Kogoshi,M.Katsurai et.al.: "Helical Heliac Coil Reconstraction by Higher Harmonic Modulation on L=1 Helical Coil" J.P.S.J. 61. 4267-4270 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 顧,小野,桂井: "コンパクトトーラスプラズマ実験装置TS-3内で生成される極低アスペクト比トーラスプラズマの平衡解" 電気学会論文誌.

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Ono,A.Morita M.Katsurai: "Merging of Two Spheromaks and its Application to Slow Formation of FRC" Proc.14th Int.Cnf on Plasma Phys and Controlled Nuclear Fasin Res.IAEA-CN. IAEA-CN-56 C-4-4 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Ono,A.Morita M.Katsurai,M.Yamada: "Exporimental Investigation of Fhree Dimensional Magnetic Reconnection by use of Two Colliding Spheromaks" Physics of Fluido.

    • Related Report
      1992 Annual Research Report
  • [Publications] N.Amemiya M.Katsurai: "Axial Compresstion of Flux-Core-Spheromaks in an Extirnal Equlibuisn Field" J.P.S.J.

    • Related Report
      1992 Annual Research Report
  • [Publications] 雨宮 他: "Formation of FreeーBoundary FluxーCare Spherewaks" Journal of the Physica Society of Japan. 60. 2632-2644 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 桂井: "自分で自分を閉じ込めるプラズマ" パリティ-. 6. 22-29 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 森田 他: "回転楕円体導体容器中におけるフラックスコア-・スフェロマックの平衡配位" 電気学会論文誌.

    • Related Report
      1991 Annual Research Report
  • [Publications] 桂井 誠: "フラックスコア-・スフェロマックの無力配位状態における近似モデルとその解析" 核融合研究. 64. 212-224 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 桂井 誠,他: "円筒容器内フラックスコア・スフェロマックの平解とその特性" 核融合研究. 64. 362-375 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Uyama,他: "Equilibrium Property and Approach to High Magnetic Field in Spheromak" Proc.13th Int.Conf.on Plasma Physics and Controlled Nuclear Fusion Research. IAEAーCNー531Cー4ー2ー1. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Yamada,他: "Experimental Investigation of Helicity Effect on Magnetic Reconnection" Proc.13th Int.Conf.on Plasma Physics and Controlled Nuclear Fusion Research. IAEAーCNー531Cー4ー2ー2. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Yamada,他: "Magnetic Reconnection of Plasma Toroids with cohelicity and Counterhelicity" Physical Review Letters. 65. 721-724 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Yamada,他: "Initial Results from Investigation of 3ーD Magnetic Reconnection in a Laboratory Plasma" Physics of Fluids.

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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