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Formation of Plasma Structures Due to Local Production of Huge Negative Ions

Research Project

Project/Area Number 09480088
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

HATAKEYAMA Rikizo  Tohoku Univ.Grad.Sch.Engrg, Prof., 大学院・工学研究科, 教授 (00108474)

Co-Investigator(Kenkyū-buntansha) HIRATA Takamichi  Tohoku Univ.Grad.Sch.Engrg, Research Asso., 大学院・工学研究科, 助手 (80260420)
ISHIGURO Seiji  National Insti.Fusion Sci.Asso.Prof., 助教授 (10193301)
IIZUKA Satoru  Tohoku Univ.Grad.Sch.Engrg, Asso.Prof., 大学院・工学研究科, 助教授 (20151227)
SATO Noriyoshi  Tohoku Univ.Grad.Sch.Engrg, Prof., 大学院・工学研究科, 教授 (40005252)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥13,700,000 (Direct Cost: ¥13,700,000)
Fiscal Year 1998: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1997: ¥10,700,000 (Direct Cost: ¥10,700,000)
KeywordsPlasma / Huge Ion / Local Production / Structure Formation / Solitary Pulse / 孤立波
Research Abstract

Huge negative ions are locally produced by introducing "Buckminsterfullerene, C_<60>" particles into a low-temperature potassium plasma column confined by a strong magnetic field. Concerning phenomena parilel to the magnetic-field lines it is experimentally found that a mechanism of reflecting a part of the electrons and ions flowing along the plasma flow exists around the region of negative ion production, and that solitary pulses with negative potential are intermittently excited, propagating downstream at an acoustic speed of the negative ions. This result is also confirmed by means of a one-dimensional electrostatic particle simulation. The plasma becomes unstable for a large rate of negative ion production, being accompanied by a double-layer formation generating the solitary pulse.
Concernig phenomena perpendicular to the magnetic-field lines positive inos are experimentally observed to strongly diffuse in the radial direction with a diffusion coefficient ten times larger than that in the absence of negative ion production. Much stronger diffusion of the negative ions is observed around the downstream exit of the region of the negative ion production. As a result, the negative ions are radially localized in the periphery region of the plasma column. A new-type drift-wave instability originating from a combination of positive and negative ions is excited around that region described just above, a radial amplitude profile of which is dominated by the negative ion profile, and which propagates in the direction of the positive-ion diamagnetic drift with the mode number 1 or 2. This drift wave excitation and the radial plasma diffusion are confirmed to be closely related.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] W.Oohara: "Electrostatic Potential Modibication Due to C^-_<60> Produetion" Proc.of 5th Sympo.on Double Layers-Potential Formation and Related Nonlinear Phenomena in Plasmas. 149-154 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] K.Furuta: "Low-Freguency bnstabilities under a Cross-Field Electric Field in a K^+-C^-_<60> Plasma" Proc.of 5th Sympo.on Double Layers-Potential Formation and Related Nonlinear Phenomena in Plasmas. 300-305 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Ishikawa: "Probe Measurements in a Negative Ion Plasma" J.Phys.Soc.Jpn.67. 158-162 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Kaneko: "Potential Structure Modified by Electron Cyclotron Resonence in a Plasma Flowalong Magnetic Field Lines with Mirror Conbiguration" Phys.Rev.Lett.80. 2602-2605 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] W.Oohara: "Plasma-Structure Formation Due to a Local Production of Huge Negative Ions" Proc.of 1998 Int.Cong.on Plasma Physics. 22C. 2419-2422 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] S.Sasaki: "Spatial Structure of K-Fullerene Plasma" Proc.of 1998 Int.Cong.on Plasma Physics. 22C. 2537-2540 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] OOHARA,Wataru: "Electrostatic Potential Modification Due to C_<60>-Production." Proc.of 5th Sympo.on Double Layers-Potntial Formation and Related Nonlinear Phenomena in Plasmas. 149-154 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] FURUTA,Kazuki: "Low-Frequency Instabilities under a Cross-Field Electric Field in a K^+-C_<60>^-Plasma." Proc.of 5th Sympo.on Double Layers-potntial Formation and Related Nonlinear Phenomena in Plasmas. 300-305 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] ISHIKAWA,Itsuo: "Probe Measurements in a Negative Ion Plasma." J.Phys.Soc.Jpn.Vol.67, No.1. 158-162 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] KANEKO,Toshiro: "Potential Structure Modified by Elec-tron Cyclotron Resonance in a Plasma Flowing along Mag-netic Field Lines with Mirror Configuration." Phys.Rev.Lett.Vol.80, No.12. 2602-2605 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] OOHARA,Wataru: "Plasma-Structure Formation Due to a Local Production of Huge Negative Ions" Proc.of 1998 Int.Cong.on Plasma Physics. Vol.22C. 2419-2422 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] SASAKI,Satoshi: "Spatial Structure of K-Fullerene Plasma." Proc.of 1998 Int.Cong.on Plasma Physics. Vol.22C. 2537-2540 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Kaneko: "Potential Structure Modified by Electron Cyclotron Resonance in a Plasma Flow along Magnetic Field Lines with Minor Configuration" Phys.Rev.Lett.80・12. 2602-2605 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大原渡: "巨大負イオンの局所生成に伴う自己励起プラズマ揺動" 電気学会プラズマ研究会資料. EP-98-24. 25-30 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] W.Oohara: "Plasma-Structure Formation Due to a Local Production of Huge Negative Ions" Proc.of 1998 Int.Cong.on Plasma Physics. 22C. 2419-2422 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Sasaki: "Spatial Structure of K-Fullerene Plasma" Proc.of 1998 Int.Cong.on Plasma Physics. 22C. 2537-2540 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] R.Hatakeyama: "Plasma Potential Formation and Particle Acceleration Due to ECRH in Diverging magnetic Field Lines" Trans.Fusion Technol.35・1T. 325-329 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Kaneko: "Formation of Plasma-Flow Dike Potential Due to Local ECR along Converging magnetic-Field Lines" Trans.Fusion Technol.35・1T. 335-339 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Kaneko: "Potential formation duets ECR under mirror configurations of magnetic field" Plasma Phys.Control.Fusion. 39・5A. A129-A136 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Sasaki: "Production of K-fullerene plasmas using a new-type sublimation oven" Proc.of 1996 Int.Conf.on Plasma Physics. 2. 1990-1993 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] R.Hatakeyama: "Measurements on rolating ion cyclotron range of freguencies induced particle fluxes in axiaymmetaic mirrer plasmas" Phys.Plasmas. 4・8. 2947-2954 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Ishiguro: "V-shaped DC patential staucture cansed by current-drigen electrostatic ion-cyclotron instebility" Phys.Rev.Lett.78・25. 4761-4764 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] W.Oohara: "Electrostatic potential modification due to Coo production" Proc.of 5th Sympo.on Dousle Layers-Potential formation and related nonlinear phonomenain plasmms. 149-154 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] K.Furuta: "Low-frequency instabilities under a cross-field electric field in a K^+-C_<60>^- plasma" Proc.of 5th Sympo.on Double Layers-potential formation and related nonliuea planoinea in plasmas. 300-305 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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