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1994 Fiscal Year Final Research Report Summary

PLASMA HEAT TRANSPORT ALONG MAGNETIC FIELD UNDER EFFECTS OF POTENTIAL DISTRIBUTION

Research Project

Project/Area Number 05402064
Research Category

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

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionUNIVERSITY OF TSUKUBA

Principal Investigator

TAMANO Teruo  INSTITUTE OF PHYSICS,PROFESSOR, 物理学系, 教授 (80236744)

Co-Investigator(Kenkyū-buntansha) YASAKA Yasuyoshi  FACULTY ENG., KYOTO UNIV., ASSOC.PROFESSOR, 工学部, 助教授 (30109037)
SAITO Teruo  INSTITUTE OF PHYSICS,ASSOC.PROFESSOR, 物理学系, 助教授 (80143163)
KIWAMOTO Yasuhito  INST.OF APPLIED PHYSICS,ASSOC.PROFESSOR, 物理工学系, 助教授 (50018040)
Project Period (FY) 1993 – 1994
KeywordsPLASMA HEAT LOAD / PLASMA POTENTIAL / THERMAL DIKE / MESH BLASING / SECONDARY ELECTRON SUPPRESSION / DIVERTER / ECRH / OPEN MAGNETIC FIELD
Research Abstract

The purpose of this research program is to investigate physical mechanisms of rapid energy transort along magnetic field lines in plasmas under controlled experimental conditions. This type of heat transport is observed in a variety of magnetized plasmas, and it is closely connected with the formation of potential distribution along the open field lines. The experiments are made in the large-scale west end plasma region in the GAMMA10 tandem mirror in PRC,Univ.of Tsukuba. The control knobs, developed for the experiment, are 2.45GHz Electron Cyclotron Resonance Heating (ECRH) system for THERMAL DIKE and MESH BIAS system. Special concern in this study lies in convective heat transport associated with particle exchange of hot electrons that hit end plates with cold electrons abundantly produced via secondary emissions. TD enhances magnetic mirror reflections and MB increases electrostatic reflection of the cold electrons so as to reduce the exchange rate of the two classes of electrons. M … More B deepens the depth of floating potential of the endplates, so that the warm electron flux reaching the endplates decreases to about a half. The effective temperature of the electrons increases with MB.Most of the heat flux is attributed to the convective electron transport because the ion flux remains much smaller than the flux of impinging primary electrons. The reduction of the heat load to the plate is also observed with a thermo-couple arry and with infra-red camera. These results demonstrate the effectiveness of MB in reducing the heat flux in plasmas. But, since the decrement of the temperature-rise is smaller than that evaluated from the particle analyzes, further tests are required on the temperature diagnostics. It may also indicate that other heat channels are active than those watched with the particle analyzers.
TD deepens the endplate potential by about 10% while the primary electron flux does not always decrease. The endplate temperature tends to decrease as a whole, though under some plasma conditions it increases, These observations motivated detailed analyzes of dynamics of primary electrons under ECRH.Using newly developed theoretical tools of a potential model and heating response function, we found that these electrons are transformed to Yushmanov particles subject to multiple heating and partially driven to the endplates, increasing heat-load. Local tailoring of the magnetic field profile at the resonance is found to be effective in increasing the benefit of TD. Less

  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Y.Tatematsu,Y.Kiwamoto,T.Saito,T.Tamano: "Effects of Yushmanov-Trapped Particles and Anisotropy of Velocity Distribution on the Potential Formation in the End Region of a Tandem Mirror" Journal of the Physical Society of Japan. 63. 558-572 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kiwamoto,T.Saito,Y,Tatematsu,I.Katanuma,Y.Yoshimura,T.Tamano: "Electron Cyclotron Resonance Heating by Strong Monochromatic Wave in Nonuniform Magnetic Field" Physics of Plasmas. 1. 834-841 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Kiwamoto,Y,Tatematsu,T.Saito,I.Katanuma,Y.Yoshimura,T.Tamano: "Theoretical Analysis of Thermal Dike Supported by Electron Cyclotron Resonsnce Heating" Physics of Plasmas. 1. 3986-3995 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yasaka,O.Sakai,H.Takeno,H.Hojo: "Selective Ion and Electron Heating and Potential Formation Using Mode Conversions of ICRF Waves in HIEI"," Nuclear Fusion. 34. 1263-1269 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Saito,Y.Kiwamoto,Y,Tatematsu,Y.Yoshimura,M.Inutake,T.Tamano: "Suppression of Secondary Electrons from an Endplate by Use of a Biased Mesh." Physics of Plasmas. 2. 352-354 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y,Tatamatsu,Y.Kiwamoto,T.Saito,Y.Yoshimura,M.Inutake,I.Katanuma,T.Tamano: "Control of Plasma Transport by Active Tailoring of Potential Profile along Open Magnetic Field" Journal of Nuclear Materials. (in press). -5 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Saito, Y.Kiwamoto, K.Kurihara, T.Cho, M.Inutake, S.Miyoshi, T.Tamano, and K.Yatsu: "Scaling Study of Potential in the End region of a Tandem Mirror Based on End Loss Electron Measurement" Physics of Fluids B. Vol.5, No.3. 866-871 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tamano: "Plasma Production in Fusion Devices : Magnetic Confinement" Journal of Plasma and Fusion Research. Vol.69, No.8. 923-927 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Katanuma, Y.Kiwamoto, N.Ohyabu, K.Ishii, K.Yatsu, and T.Tamano: "Electron Confining Potential When the Electrons Have Finite Axial Loss Time" Journal of the Physical Society of Japan. Vol.62, No.10. 3446-3459 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Katanuma, Y.Kiwamoto, L.G.Bruskin, K.Yatsu, and T,Tamano: "On the Continuity of electrostatic potential along a Magnetic Field" Journal of the Physical Society of Japan. Vol.63, No.2. 393-396 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Tatematsu, Y.Kiwamoto, T.Saito, and T.Tamano: "Effects of Yushmanov-Trapped Particles and Anisotropy of Velocity Distribution on the Potential Formation in the End Region of a Tandem Mirror" Journal of the Physical Society of Japan. Vol.63, No.2. 558-572 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kiwamoto, T.Saito, Y.Tatematsu, I.Katanuma, Y.Yoshimura, and T.Tamano: "Electron Cyclotron Resonance Heating by Strong Monochromatic Wave in Nonuniform Magnetic Field" Physics of Plasmas. Vol.1, No.4. 834-841 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Yasaka, O.Sakai, H.Takeno, and H.Hojo: "Selective Ion and Electron Heating and Potential Formation Using Mode Conversions of ICRF Waves in HIEI" Nuclear Fusion. Vol.34, No.9. 1263-1269 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] O.Sakai and Y.Yasaka: "Mode conversion of fast magnetosonic waves and minority ion heating in a longitudinally inhomogeneous magnetic field" Physics of Plasmas. Vol.1, No.12. 3896-3904 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kiwamoto, Y.Tatematsu, T.Saito, I.Katanuma, Y.Yoshimura, and T.Tamano: "Theoretical Analysis of Thermal Dike Supported by Electron Cyclotron Resonance Heating" Physics of Plasmas. Vol.1, No.12. 3986-3955 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Takeno, Y.Yasaka, O.Sakai, and R.Itatani: "High density central cell plasma production and ion heating by helicon wave damping and its mode conversion into a slow Alven wave" Nuclear Fusion. Vol.35, No.1. 75-85 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Saito, Y.Kiwamoto, Y.Tatematsu, Y.Yoshimura, T.Takahashi, M.Inutake, and T.Tamano: "Suppression of Secondary Electrons from an Endplate by Use of a Biased Mesh" Physics of Plasmas. Vol.2, No.2. 352-354 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Tatematsu, Y.Kiwamoto, T.Saito, Y.Yoshimura, T.Takahashi, I.Katanuma, M.Inutake, and T.Tamano: "Control of Plasma Transoprt by Active Tailoring of Potential Profile along Open Magnetic Field" Journal of Nuclear Materials. (in press). 5 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tamano: "Tandem Mirror Experiments in GAMMA10" Physics of Plasmas. Vol.2, No.6. 9 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Tamano, et.al.: "Recent Results of Tandem Mirror Experiments in GAMMA10 and HIEI" Proc.15th Conf.on Plasma Physics and Controlled Nucl.Fusion Res.at Seville, Spain (1994) /IAEA-CN-60/C-I-I.

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

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Published: 1996-04-15  

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