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2003 Fiscal Year Final Research Report Summary

Development of a Novel Ion-Current Semiconductor Detector for Distinguishing Incident Ions and Electrons

Research Project

Project/Area Number 14580512
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionUniversity of Tsukuba

Principal Investigator

HIRATA Mafumi  University of Tsukuba, Institute of Physics, Assistant Professor, 物理学系, 講師 (70222247)

Co-Investigator(Kenkyū-buntansha) NAKASHIMA Yousuke  University of Tsukuba, Institute of Physics, Associate Professor, 物理学系, 助教授 (00188939)
KOHAGURA Junko  University of Tsukuba, Institute of Physics, Assistant Professor, 物理学系, 講師 (60302345)
CHO Teruji  University of Tsukuba, Institute of Physics, Professor, 物理学系, 教授 (80171958)
Project Period (FY) 2002 – 2003
KeywordsTandem Mirror Plasma / Potential Confinement / Potential Formation Mechanisms / Semiconductor ion Detector / Semiconductor Response Theory / End-Loss Ion Currents / Ion Diagnostics / Plasma Confining Potential
Research Abstract

For the purpose of end-loss-ion energy analyzes in open-field plasmas, a newly developed electrostatic ion-energy spectrometer is proposed on the basis of a "self-collection" principle for secondary electron emission from a metal collector. The ion-energy spectrometer is designed with multiple grids for analyzing incident ion energies, and a set of parallelized placed metal plates with respect to lines of ambient magnetic forces in an open-ended device. One of the most important characteristic properties of this spectrometer is the use of our proposed principle of a "self-collection" mechanism due to E×B drifts for secondary electrons emitted from the grounded metal-plate collector by the use of no further additional magnetic systems except the ambient open-ended fields B. The proof-of-principle and characterization experiments are carried out by the use of a test-ion-beam line along with an additional use of a Helmholtz coil system for the formation of open magnetic fields similar to those in the GAMMA 10 end region. The applications of the developed ion-energy spectrometer for end-loss-ion diagnostics in the GAMMA 10 plasma experiments are demonstrated under the conditions with simultaneous incidence of energetic electrons produced by electron-cyclotron heatings for end-loss-plugging potential formation, since these electrons have contributed to disturb these ion signals from conventional end-loss-ion detectors.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] M.Hirata et al.: "A Novel Electrostatic Ion-Current Absolute-Value Detector under Circumstances with Simultaneous Electron Incidence by the Use of a Proposed "Self-Collection" Method for Secondary Electron Emission"Transactions of Fusion Science and Technology. Vol.43. 262-264 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yoshida et al.: "Relation of the Spatial Profile of Ion Confining Potentials with the Improvement in Plasma Confinement Using Novel Ion-Energy Spectrometer Arrays in GAMMA 10"Transactions of Fusion Science and Technology. vol.43. 289-291 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hirata et al.: "A novel electrostatic ion-energy spectrometer by the use of a proposed "self-collection" method for secondary-electron emission from a metal collector"Review of Scientific Instruments. Vol.74. 1913-1916 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Yoshida et al.: "Spatial Profile Measurements of Ion-Confining Potentials Using Novel Position-Sensitive Ion-Energy Spectrometer Arrays"Nuclear Instruments and Methods in Physics Research A. Vol.513. 99-102 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Cho et al.: "Extended Consolidation of Scaling Laws of Potential Formation and Effects Covering the Representative Tandem Mirror Operations in GAMMA 10"Nuclear Fusion. Vol.43. 293-298 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Cho et al.: "Sheared Radial Electric-Field Effects on Turbulence Suppression due to Doubly Advanced Potential-Height Formation"Journal of Plasma and Fusion Research. Vol.80. 81-82 (2004)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hirata et al.: "A Novel Electrostatic Ion-Current Absolute-Value Detector under Circumstances with Simultaneous Electron Incidence by the Use of a Proposed "Self-Collection" Method for Secondary Electron Emission"Transactions of Fusion Science and Technology. Vol.43. 262-264 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yoshida et al.: "Relation of the Spatial Profile of Ion Confining Potentials with the Improvement in Plasma Confinement Using Novel Ion-Energy Spectrometer Arrays in GAMMA 10"Transactions of Fusion Science and Technology. Vol.43. 289-291 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hirata et al.: "A novel electrostatic ion-energy spectrometer by the use of a proposed "self-collection" method for secondary-electron emission from a metal collector"Review of Scientific Instruments. Vol.74. 1913-1916 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yoshida et al.: "Spatial Profile Measurements of Ion-Confining Potentials Using Novel Position-Sensitive Ion-Energy Spectrometer Arrays"Nuclear Instruments and Methods in Physics Research A. Vol.513. 99-102 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Cho et al.: "Extended Consolidation of Scaling Laws of Potential Formation and Effects Covering the Representative Tandem Mirror Operations in GAMMA 10"Nuclear Fusion. Vol.43. 293-298 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Cho et al.: "Sheared Radial Electric-Field Effects on Turbulence Suppression due to Doubly Advanced Potential-Height Formation"Journal of Plasma and Fusion Research. Vol.80. 81-82 (2004)

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

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Published: 2005-04-19  

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