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1989 Fiscal Year Final Research Report Summary

Improvement of Spheromak-Plasma Confinement

Research Project

Project/Area Number 63580003
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionThe University of Tokyo

Principal Investigator

KANEKO Shobu  Faculty of Engineering, The University of Tokyo; Professor, 工学部, 教授 (70010717)

Co-Investigator(Kenkyū-buntansha) TAGUCHI Masayoshi  Faculty of Engineering, The University of Tokyo; Assistant, 工学部, 助手 (30154959)
Project Period (FY) 1988 – 1989
KeywordsSpheromak / Plasma / Stability / Confinement / Current Drive / High Frequency Wave / Plasma Rotation / Magnetic Diffusion
Research Abstract

This research program aims to improve the plasma confinement of the spheromak device, CTCC-II, at Osaka University. Through this study, we expect to increase our physical knowledge on the spheromak and plasma physics. We have investigated the following five subjects.
1. Stability analysis by the TSC (Princeton Tokamak Simulation Code). 2. Effects, of the central conducting pole and the choking current on the spheromak plasma with flux hole. 3. Effects of the plasma rotation on the plasma equilibrium quantities. 4. Equilibrium and stability of the flux-core spheromak with the pressure gradient. 5. Effects of the current drive using the electron cyclotron resonance absorption.
The main results obtained on the above subjects are the following. 1. The spheromak is shown to be stable against the axially symmetric resistive MHD perturbations. The values of the diffusion coefficient and the thermal conductivity should be about 100 times larger than those of the classical (Spitzer's) values to explain experimental results. 2. The stability effects of the central conducting pole depend on the plasma-current distribution. This explains the experimental result on the plasma life time. The plasma confinement is sharply enhanced when the flux hole is generated. The maximum values of beta ratio on the magnetic axis, under which the Mercier criterion is satisfied, is at most 6%. This value is evaluated by use of the optimized pressure distribution. 3. There is a small difference between experimental and theoretical results on the poloidal and toroidal magnetic fields. We can show this difference is qualitatively explained by considering the plasma rotation about its symmetric axis. We have investigated basic problems on the current drive in the subjects 4. and 5.
From the above investigations, we have surely achieved the purpose of the research program mentioned above.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Atsushi Kamitani: "Stability of Spheromak against Current Driven Modes-Effects of Flux Hole on Stability" Journal of the Physical Society of Japan. 57. 3809-3819 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shobu Kaneko: "Improvement on plasma Confinement of Spheromak" Proc.of 10th US-Japan Workshop in Compact Toroids,hakone,1988. 37-40 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yusi Kato: "Spheromak Confinement in Perfectly Closed Magnetic Surfaces near Entrance Hole of Flux Conserver" Proc.of the 12th Int.Conf.Plasma Physics and Controlled Nuclear fusion Research,Nice,1988. 2. 727-735 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masayoshi Taguchi: "ECRH Current Drive in Tokamak Plasmas" Plasma Phys.Contr.Fusion. 31. 241-254 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Masayoshi Taguchi: "Neoclassical Effects on Current Drive" Kakuyugo Kenkyu. 62. 369-375 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shobu Kaneko: "Effects of Central Conducting Pole and Choking Current on Confinement of Spheromak with Flux Hole" Journal of the Physical Society of Japan. 59. 553-561 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Atsusi Kamitani: "Stability of Spheromak against Current Driven Modes -Effects of Flux Hole on Stability-" J. Phys. Soc. Jpn. 57, 3809-3819 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shobu Kaneko: "Improvement on Plasma Confinement of Spheromak" Proc. of 10th US-Japan Workshop on Compact Toroids, p. 37-40, Hakone (1988).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yusi Kato: "Spheromak Confinement in Perfectly Closed Magnetic Surfaces near Entrance Hole of Flux Conserver" Proc. of the 12th Int. Conf. Plasma Physics and Controlled Nuclear Fusion Research, Nice, 2, 727-735 (1988).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masayoshi Taguchi: "ECRH Current Drive in Tokamak Plasmas" Plasma Phys. Contr. Fusion 31, 241-254 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Masayoshi Taguchi: "Neoclassical Effects on Current Drive" Kakuyugo Kenkyu 62, 369 (1989).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shobu Kaneko: "Effects of Central Conducting Pole and Choking Current on Confinement of Spheromak with Flux Hole" J. Phys. Soc. Jpn. 59, 553-561 (1990).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-26  

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