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Direct Measurement of Bounce Ions and Suppression of Radial Transport by Control of Radial Electric Field

Research Project

Project/Area Number 15360488
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionUniversity of Tsukuba

Principal Investigator

ISHII Kameo  University of Tsukuba, Graduate School of Pure and Applied Science, Associate Professor, 大学院・数理物質科学研究科, 助教授 (10015844)

Co-Investigator(Kenkyū-buntansha) SAITO Teruo  University of Tsukuba, Graduate School of Pure and Applied Science, Associate Professor, 大学院・数理物質科学研究科, 助教授 (80143163)
KATANUMA Isao  University of Tsukuba, Graduate School of Pure and Applied Science, Associate Professor, 大学院・数理物質科学研究科, 助教授 (70134202)
YOSHIKAWA Masayuki  University of Tsukuba, Graduate School of Pure and Applied Science, Associate Professor, 大学院・数理物質科学研究科, 助教授 (00272138)
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2004: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2003: ¥4,400,000 (Direct Cost: ¥4,400,000)
KeywordsPlug Potential Bounce Ion / Potential Confinement / Tandem Mirror / Radial Electrostatic Field / Radial Transport / Charge Exchange Bounce Ion Analyzer / Gold Neutral Beam Probe / Coaxially Divided End-Plates / ピッチ角指定小型高効率エネルギー分析器 / 金中性粒子ビームポローブ / 同軸分離型エンドプレート / バウンスイオン / 端損失イオン / 径方向電場制御 / 径方向電位分布測定 / 径方向電位分布最適化 / 閉じ込め改善
Research Abstract

The purpose of this research is to investigate the transport of ions bouncing between the electrostatic plug potentials or magnetic mirrors passing through the anchor cells having a non-axisymmetric magnetic field configuration. Existence of the bounced ion by the plug potential is essential for improvement of the plasma confinement in the tandem mirror. We observed the bounce ions using two kinds of measurement techniques, that is, we measured the bounce ions as the peaking end-loss ions appeared after switching off the microwave injection into the plug region by use of an end-loss energy component analyzer (ELECA), and we measured the bounce ions by use of a charge exchange bounce ion analyzer of a compact type (CXBIA) located near the inner mirror throat of the plug/barrier cell.
The transport of the bounce ions to the loss region, which was caused by the Alfven ion-cyclotron (AIC) fluctuation excited in the central solenoid and measured using a gold neutral beam probe (GNBP), was in … More vestigated from a view point of the ion diffusion across the loss boundary in the velocity space by measurement of the velocity distribution function of the end-loss ion. We observed the gentle hump structure on the energy distribution function of the end-loss ion, which was measured by the ELECA device, and estimated the enhancement factor. In order to control the radial potential profile of the core plasma, we changed the electrostatic potentials of the coaxially divided end plates, and observed experimentally the effect of the control of the potential profile. The trajectories of the bounced ions by the plug potential were calculated as a function of the width of the radial potential profile on the assumption that the shape of the magnetic flux tube was slightly different from the shape of the equi-potential surface at the mirror throats of the anchor cell. The discrepancy enhanced the radial transport for the bounce ions to flow from the bounce region to the loss region.
We confirmed experimentally and theoretically that the spread type of radial potential profile of the core plasma was effective for the increase of the density of the plasma and also the bounce ions. It is important that the microwave injection for the creation of the plug potential should be considered from this point of view. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (38 results)

All 2005 2004 2003 Other

All Journal Article (34 results) Publications (4 results)

  • [Journal Article] Effect of the Radial Potential Profile on the Transport of the Bounced Ions by the Plug Potential and Radial Potential Control in the Tandem Mirror.2005

    • Author(s)
      K.Ishii, A.Kojima, Y.Miyata, Y.Takemura, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45,No.1T

      Pages: 78-83

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Transport of the Bounced Ion by the Plug Potential Caused by Radial Electric Field in the Tandem Mirror2005

    • Author(s)
      K.Ishii, A.Miyata, A.Kojima, T.Yamaguchi, et al.
    • Journal Title

      Czechoslovak Journal of Physics (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] High Power Electron Heating Experiments at the Plug Region of GAMMA 10.2005

    • Author(s)
      T.Saito, K.Ishii, A.Itakura, M.Ichimura, et al.
    • Journal Title

      Journal of Plasma and Fusion Research (in press)

    • NAID

      110006281930

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The Radial Loss of Ions Trapped in the Thermal Barrier Potential and the Design of Divertor Magnetic Field in GAMMA10.2005

    • Author(s)
      I.Katanuma, T.Ito, H.Saimaru, Y.Sasagawa, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45,No.1T

      Pages: 276-278

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] H□ Measurements in the Plug/Barrier Cells of the Tandem Mirror GAMMA 102005

    • Author(s)
      M.Yoshikawa, M.Saito, Y.Kubota, T.Kobayashi, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45,No.1T

      Pages: 339-341

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Transport of the Bounced Ion by the Plug Potential Caused by Radial Electric Field in the Tandem Mirror.2005

    • Author(s)
      K.Ishii, A.Miyata, A.Kojima, T.Yamaguchi, et al.
    • Journal Title

      Czechoslovak Journal of Physics (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] The Radial Loss of Ions Trapped in the Thermal Barrier Potential and The Design of Divertor Magnetic Field in GAMMA10.2005

    • Author(s)
      I.Katanuma, T.Ito, H.Saimaru, Y.Sasagawa, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45, No.1T

      Pages: 276-278

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Hα Measurements in the Plug/Barrier Cells of the Tandem Mirror GAMMA 10.2005

    • Author(s)
      M.Yoshikawa, M.Saito, Y.Kubota, T.Kobayashi, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45, No.1T

      Pages: 339-341

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Effect of the Radial Potential Profile on the Transport of the Bounced Ions by the Plug Potential and Radial Potential Control in the Tandem Mirror (invited paper).2005

    • Author(s)
      K.Ishii, A.Kojima, Y.Miyata, Y.Takemura, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45, No.1T

      Pages: 78-83

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Radial Electric Field Control for Retardation of Radial Transport of Bounce Ions in the Tandem Mirror.2005

    • Author(s)
      K.Ishii, Y.Takemura, A.Kojima, K.Hagisawa, et al.
    • Journal Title

      Transactions of Fusion Technology in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Transport of the Bounced Ion by the Plug Potential Caused by Radial Electric Field in the Tandem Mirror2005

    • Author(s)
      K.Ishii, A.Miyata, A.Kojima, T.Yamaguchi, et al.
    • Journal Title

      Czechoslovak Journal of Physics in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] High Power Electron Heating Experiments at the Plug Region of GAMMA 10 (invited paper).2005

    • Author(s)
      T.Saito, K.Ishii, A.Itakura, M.Ichimura, et al.
    • Journal Title

      Journal of Plasma and Fusion Research in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] The Radial Loss of Ions Trapped in the Thermal Barrier Potential and the Design of Divertor Magnetic Field in GAMMA10.2005

    • Author(s)
      I.Katanuma, T.Ita, H.Saimaru, Y.Sasagawa, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45, No.1T

      Pages: 276-278

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Ion radial transport due to a non-uniform electrostatic potential in a magnetic mirror.2005

    • Author(s)
      I.Katanuma, H.Saimaru, Y.Tatematsu, et al.
    • Journal Title

      Transactions of Fusion Technology in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Hα Measurements in the Plug/Barrier Cells of the Tandem Mirror GAMMA 102005

    • Author(s)
      M.Yoshikawa, M.Saito, Y.Kubota, T.Kobayashi, et al.
    • Journal Title

      Transactions of Fusion Science and Technology Vol.45, No.1T

      Pages: 339-341

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Study of Impurity Ion radiation intensities using collisional-radiative model in the GAMMA 10 plasma.2005

    • Author(s)
      M.Yoshikawa, K.Sedo, Y.Kubota, T.Kobayashi, et al.
    • Journal Title

      Journal of Plasma and Fusion Research in press

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Radial Electric Field Control for Retardation of Radial Transport of Bounce Ions in the Tandem Mirror.2004

    • Author(s)
      K.Ishii, Y.Takemura, A.Kojima, K.Hagisawa, et al.
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.6

      Pages: 542-545

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Direct Measurements of the Electrostatically and Magnetically Bounced Ions in the Tandem Mirror.2004

    • Author(s)
      K.Ishii, K.Hagisawa, Y.Takemura, A.Kojima, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75,No.10

      Pages: 3619-3621

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Two-dimensional Potential Profile and Density Measurements by Use of an Improved Gold Neutral Beam Probe.2004

    • Author(s)
      Y.Takemura, K.Ishii, A.Kojima, K.Hagisawa, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75,No.10

      Pages: 3649-3651

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Expansion of Scaling Law of Field Aligned Potential Difference with Increased Plug ECRH Power in GAMMA 10.2004

    • Author(s)
      T.Saito, Y.Tatematsu, H.Ikegami, T.Sekine, et al.
    • Journal Title

      Journal of Plasma and Fusion Research Vol.80,No.6

      Pages: 425-426

    • NAID

      110003827703

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ion Measurement of the Edge Plasma in the GAMMA 10 Tandem Mirror Device with an Ion Sensitive Probe.2004

    • Author(s)
      T.Sekine, T.Saito, Y.Tatematsu, T.Yasuoka, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75,No.10

      Pages: 4317-4319

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ion radial transport due to a non-uniform electrostatic potential in a magnetic mirror.2004

    • Author(s)
      I.Katanuma, H.Saimaru, Y.Tatematsu, et al.
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.6

      Pages: 461-464

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Study of Impurity Ion radiation intensities using collisional-radiative model in the GAMMA 10 plasma.2004

    • Author(s)
      M.Yoshikawa, K.Sedo, Y.Kubota, T.Kobayashi, et al.
    • Journal Title

      Journal of Plasma and Fusion Research SERIES Vol.6

      Pages: 685-688

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Absolute calibration for vacuum ultraviolet spectrograph system for plasma diagnostics.2004

    • Author(s)
      M.Yoshikawa, Y.Kubota, T.Kobayashi, M.Saito, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75

      Pages: 4088-4090

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Direct Measurements of the Electrostatically and Magnetically Bounced Ions in the Tandem Mirror.2004

    • Author(s)
      K.Ishii, K.Hagisawa, Y.Takemura, A.Kojima, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75, No.10

      Pages: 3619-3621

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Two-dimensional Potential Profile and Density Measurements by Use of an Improved Gold Neutral Beam Probe.2004

    • Author(s)
      Y.Takemura, K.Ishii, A.Kojima, K.Hagisawa, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75, No.10

      Pages: 3649-3651

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Expansion of Scaling Law of Field Aligned Potential Difference with Increased Plug ECRH Power in GAMMA 10.2004

    • Author(s)
      T.Saito, Y.Tatematsu, H.Ikegami, T.Sekine, et al.
    • Journal Title

      Journal of Plasma and Fusion Research Vol.80, No.6

      Pages: 425-426

    • NAID

      110003827703

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Ion Measurement of the Edge Plasma in the GAMMA 10 Tandem Mirror Devicewith an Ion Sensitive Probe.2004

    • Author(s)
      T.Sekine, T.Saito, Y.Tatematsu, T.Yasuoka, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75, No 10

      Pages: 4317-4319

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Two-dimensional Potential Profile and Density Measurements by Use of an Improved Gold Neutral Beam Probe.2004

    • Author(s)
      Takemura, K.Ishii, A.Kojima, K.Hagisawa, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75, No.10

      Pages: 3649-3651

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Expansion of Scaling Law of Field-Aligned Potential Difference with Increased Plug ECRH Power in GAMMA 10.2004

    • Author(s)
      T.Saito, Y.Tatematsu, H.Ikegami, T.Sekine, et al.
    • Journal Title

      Journal of Plasma and Fusion Research Vol.80, No.6

      Pages: 425-426

    • NAID

      110003827703

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Ion Measurement of the Edge Plasma in the GAMMA 10 Tandem Mirror Device with an Ion Sensitive Probe.2004

    • Author(s)
      T.Sekine, T.Saito, Y.Tatematsu, T.Yasuoka, et al.
    • Journal Title

      Review of Scientific Instruments Vol.75, No.10

      Pages: 4317-4319

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Collision effects on the saturated electrostatic potential along a magnetic field line.2003

    • Author(s)
      I.Katanuma, Y.Tatematsu, K.Ishii, T.Saito, K.Yatsu
    • Journal Title

      Physics of Plasmas Vol.10,No.3

      Pages: 677-682

    • NAID

      120007131801

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Collision effects on the saturated electrostatic potential along a magnetic field line.2003

    • Author(s)
      I.Katanuma, Y.Tatematsu, K.Ishii, T.Saito, K.Yatsu.
    • Journal Title

      Physics of Plasmas Vol.10, NO.3

      Pages: 677-682

    • NAID

      120007131801

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Collision effects on the saturated electrostatic potential along a magnetic field line.2003

    • Author(s)
      I.Katanuma, Y.Tatematsu, K.Ishii, T.Saito, K.Yatsu
    • Journal Title

      Physics of Plasmas Vol.10, No.3

      Pages: 677-682

    • NAID

      120007131801

    • Related Report
      2004 Annual Research Report
  • [Publications] K.Ishii, Y.Takemura, A.Fucki, et al.: "Radial Potential Control for Plasma Confinement in the Tandem Mirror GAMMA 10"Transactions of Fusion Science and Technology. Vol.43, No.1T. 142-146 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] I.Katanuma, Y.Tatematsu, K.Ishii, et al.: "A Single Minimum-B Tandem Mirror"Transactions of Fusion Science and Technology. Vol.43, No.1T. 219-221 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Saito, Y.Tatematsu, Y.Imaizumi, et al.: "Study of the Potential Structure from the Plug-Barrier Cell to the End Plate in GAMMA 10"Transactions of Fusion Science and Technology. Vol.43, No.1T. 167-171 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] M.Yoshikawa, T.Furukara, Y.Kubota.et al.: "Study of Impurity Ions Behavior in the GAMMA 10 Plasma"Transactions of Fusion Science and Technology. Vol.43, No.1T. 189-191 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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