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Study on RF Tandem Mirror

Research Project

Project/Area Number 62420051
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionKyoto University

Principal Investigator

ITATANI Ryohei  KYOTO UNIV., ENGINEERING, PROF., 工学部, 教授 (90025833)

Co-Investigator(Kenkyū-buntansha) HOJO Hitoshi  TSUKUBA UNIV., PHYS., ASSOC. PROF., 物理学系, 助教授 (30116660)
KUBO Makoto  KYOTO UNIV., ENGINEERING, TECH., 工学部, 教務職員 (80089127)
YASAKA Yasuyoshi  KYOTO UNIV., ENGINEERING, ASSOC. PROF., 工学部, 助教授 (30109037)
阿部 宏尹  京都大学, 工学部, 講師 (30026140)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥18,400,000 (Direct Cost: ¥18,400,000)
Fiscal Year 1989: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1988: ¥8,000,000 (Direct Cost: ¥8,000,000)
Fiscal Year 1987: ¥7,300,000 (Direct Cost: ¥7,300,000)
KeywordsTandem Mirror / Ion Cyclotron Heating / Helicon Wave / Ion Hybrid Resonance / MHD Stability / Potential / Confinement / Thermal Barrier / タンデムミラー / MHD安定化 / RF安定化
Research Abstract

The main purpose of the RF tandem mirror project is to demonstrate plasma confinement in purely axisymmetric magnetic field configuration by using ICRF power only. We have revealed that the plasma production, MHD-stabilization, ion heating, and plug and thermal barrier potential formation can all be achieved by a combination of the central RF and the plug RF.
The highest peak density produced by the helicon/fast wave excited by the central RF is 1.8X10^<13>cm^<-3> with the beta value of - 10 % for helium plasma. In a two-ion-species plasma, ion temperatures of Ti_1 - 220 eV have been achieved at densities of 0.4x10^<13>cm^<-3>. This heating is due to the mode conversion of the helicon/fast wave into the slow Alfven wave at the hybrid resonance. The plasma is MHD-stable due to the RF ponderomotive effect. The central RF produces the potential dip at the plug midplane. This dip is formed by the sloshing ion distribution created by the minority ion heating in the plug cell. The plug potential phi c of 60- 80V is observed resulting in reduced end loss flux. The axial confinement time is improved by a factor of 2-3. By the additional application of the plug RF, the thermal barrier potential of phi B - 90 V is created with phi c - 100 V. The value of phi B increases with the plug RF power. it is likely that the barrier pumping is provided by the non-ambipolar ion convection driven by the azimuthal ponderomotive force of the plug cell RF.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] Y.YASAKA: "ICRF Heating with Mode Control Provided by a Rotating Field Antenna" Nuclear Fusion. 28. 1765-1770 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 八坂保能: "アドパンストタンデムミラ-の基礎研究" 核融合研究会報告集(核融合特別研究総合総括班). 152-155 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.YASAKA: "Experiments on Effectiveness of Mode Controlled ICRF to both Axisymmetric Mirrors and Tokamaks" Plasma Physics and Controlled Nuclear Fusion Research. 1. 727-732 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.YASAKA: "ICRF Stabilization and Potential Formation in HIEI" 「磁場閉じ込め装置における電場と輸送の制御」研究会報告集. 27-31 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y.YASAKA: "Observation of Ion Cyclotron Heating due to Mode Conversion of Fast Waves in a Simple Mirror" Phys.Fluids B(発表予定).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H.HOJO: "Potential Enhancement due to RF-Induced Parallel Velocity Space Diffusion in a Tandem Mirror" J.Phys.Soc.Jpn. 59. 789-792 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. YASAKA: "ICRF Heating with Mode Control Provided by a Rotating Field Antenna" Nuclear Fusion. Vol.28. 1765-1770 (1988)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. YASAKA: "Basic Experiments on Advanced Tandem Mirror (in Japanese)" Proc. of Workshop on Nucl. Fusion, pp.152-155, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. YASAKA: "Experiments on Effectiveness of Mode Controlled ICRF to both Axisymmetric Mirrors and Tokamaks" Plasma Phys. and Controlled Nucl. Fusion Research, Vol.1 pp.727-732, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. YASAKA: "ICRF Stabilization and Potential Formation in HIEI" Proc. of Workshop on Control of Potential and Transport, pp.27-31, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Y. YASAKA: "Observation of Ion Cyclotron Heating due to Mode Conversion of Fast Waves in a Simple Mirror (in preparation)" Phys. Fluids B.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] H. HOJO: "Potential Enhancement due to RF-Induced Parallel Velocity Space Diffusion in a Tandem Mirror" J. Phys. Soc. Jpn, Vol.59 pp.789-792, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 八坂保能: "アドバンストタンデムミラ-の基礎研究" 核融合研究会報告集. 152-155 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Yasaka: "Experiments on Effectiveness of Mode Controlled ICRF to both Axisymmetric Mirrors and Tokamaks" Plasma Physics and Controlled Nuclear Fusion Research. 1. 727-732 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] R.Itatani: "Experiments in the HIEI Tandem Mirror" Summary Report of Q-115 Workshop on Radial Transport in Tandem Mirrors(U.Wisconsin). (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Yasaka: "ICRF Stabilization and Potential Formation in HIEI" 「磁場閉じ込め装置における電場と輸送の制御」研究会報告集.

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.Yasaka: "Observation of Ion Cyclotron Heating due to Mode Conversion of Fast Waves in a Simple Mirror" Phys.Fluids.

    • Related Report
      1989 Annual Research Report
  • [Publications] Y.YASAKA: Summary Report of US-Japan Workshop on Analysis of Experimental Results from Mirrors(Tsukuba). (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.YASAKA: Proc.12th International Conf.on Plasma Physics and Controlled Nuclear Fusion Research(Nice). CNー50. E-IV-5 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.YASAKA: Nuclear Fusion. 28. 1765-1770 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] Y.YASAKA: Proc.Japan-US Workshop on 14MeV Neutron Source for Material R & D Based on Plasma Devices(Osaka). 361-372 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 八坂保能: 核融合研究会報告書.

    • Related Report
      1988 Annual Research Report
  • [Publications] 竹〓裕正: 高周波電磁場によるプラズマの加熱と制御に関する理論・シミュレーション研究ワークショップ. 51-54 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 八坂保能: プラズマ核融合学会第5回年会講演予稿集. 28-PD2 (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 竹堅裕正: プラズマ核融合学会第5回年会講演予稿集. 28-PD3 (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 竹堅裕正: 日本物理学会第43回年会講演予稿集. 2P-H3-6 (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] Y. Yasaka: Nuclear Fusion. 28. (1988)

    • Related Report
      1987 Annual Research Report
  • [Publications] 北條仁士: プラズマ核融合学会第5回年会講演予稿集. 28-PD4 (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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