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2000 Fiscal Year Final Research Report Summary

Studies of Physics Scaling and the Experimental Verification of the Effects of Fusion-Produced Neutrons on Semiconductor Detectors

Research Project

Project/Area Number 11480111
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

CHO Teruji  Univ.Tsukuba, Institute of Physics, Professor, 物理学系, 教授 (80171958)

Co-Investigator(Kenkyū-buntansha) NAKASHIMA Yousuke  Univ.Tsukuba, Plasma Research Centre/Insti.Physics, Associate Prof., プラズマ研究センター, 助教授 (00188939)
KONDOH Mafumi (HIRATA,MAFUMI)  Univ.Tsukuba, Plasma Research Centre/Insti.Physics, Assistant Prof., プラズマ研究センター, 講師 (70222247)
KOHAGURA Junko  Univ.Tsukuba, Plasma Research Centre/Insti.Physics, Research Associate, プラズマ研究センター, 助手 (60302345)
MAEZAWA Hideki  Photon Factory, KEK, Professor, 放射光実験施設, 教授 (40150015)
YOSHIKAWA Masayuki  Univ.Tsukeba, Plasma Research Centre/Insti. Physics, Assistant Prof., 物理学系, 講師 (00272138)
Project Period (FY) 1999 – 2000
KeywordsNeutron Diagnostics / Neutron Damage / Fusion Produced Neutrons / High Temperature Plasmas / Synchrotron Radiation / Cyclotron Accelerator / Scaling Law / Semiconductor Detector
Research Abstract

The effects of fusion produced neutrons on the x-ray energy responses are investigated for x-ray tomography detector arrays in the GAMMA 10 tandem mirror (p-type silicon) and the Joint European Torus (JET) tokamak (n-type silicon). X-ray energy responses of these detector arrays after neutron exposure are studied using synchrotron radiation from a 2.5 GeV positron storage ring at the Photon Factory. For estimation of neutron effects on x-ray-sensitive depletion thickness, changes in the material properties of the detector arrays are investigated using an impedance analyzer. Well-calibrated neutron-irradiation experiments are performed using a cyclotron accelerator facility so as to simulate the effects of fusion produced neutrons on plasma x-ray detectors. Degradation of the x-ray responses after neutron exposure due to fusion plasma shots in JET as well as cyclotron-produced neutron irradiations are found to have a functional dependence on x-ray energy. Recovery of the x-ray energy response is found with increasing applied bias to a detector. Such properties are well interpreted using our theory in terms of the neutron effects on the diffusion length and the resistivity of detectors.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] T.Cho et al.: "Generalized physics scaling laws of the formation and effects of plasma-confining potentials covering over the representative tandem-mirror operations in GAMMA 10"Physical Review Letters. (Accepted for publication)(印刷中). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Cho et al.: "Summarized Scaling Laws of Potential Confined Plasmas in the GAMMA 10 Tandem Mirror"Transactions of Fusion Technology. 39. 33-40 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Hirata et al.: "Development of Novel Ion-Energy Spectrometer Using a Semiconductor Detector Collector Under a Circumstance of Simultaneously Incident Ions and Electrons with X rays"Transactions of Fusion Technology. 39. 281-284 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Kohagura et al.: "Characterization of X-Ray-Energy Responses of Semiconductor Detectors After Fusion Produced Neutron Exposure"Transactions of Fusion Technology. 39. 159-162 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Cho et al.: "Effects of Neutrons on Semiconductor X-Ray Detectors Including n-Type Joint European Torus and p-Type GAMMA 10 Tomography Detectors"Review of Scientific Instruments. 70. 577-580 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.Kohagura et al.: "Newly Developed Matrix-Type Semiconductor Detector for Temporally and Spatially Resolved X-Ray Analyses Ranging Down to a Few Tens eV Using a Single Plasma Shot"Review of Scientific Instruments. 70. 633-636 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Cho et al.: "Generalized physics scaling laws of the formation and effects of plasma-confining potentials covering over the representative tandem-mirror operations in GAMMA 10"Physical Review Letters. (Accepted for publication). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Cho et al.: "Effects of Neutrons on Semiconductor X-Ray Detectors Including n-Type Joint European Torus and p-Type GAMMA 10 Tomography Detectors"Review of Scientific Instruments. 70. 577-580 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Cho et al.: "Investigations of Electron Behavior in the GAMMA 10 Tandem Mirror on the Basis of X-ray Analyses Using a Novel Theory on Semiconductor Detector Response"Transactions of Fusion Technology. 35. 151-155 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Kohagura et al.: "Newly Developed Matrix-Type Semiconductor Detector for Temporally and Spatially Resolved X-Ray Analyses Ranging Down to a Few Tens eV Using a Single Plasma Shot"Review of Scientific Instruments. 70. 633-636 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.Kohagura et al.: "Characterization of X-Ray-Energy Responses of Semiconductor Detectors After Fusion Produced Neutron Exposure"Transactions of Fusion Technology. 39. 159-162 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Hirata et al.: "Development of Novel Ion-Energy Spectrometer Using a Semiconductor Detector Collector Under a Circumstance of Simultaneously Incident Ions and Electrons with X rays"Transactions of Fusion Technology. 39. 281-284 (2001)

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

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Published: 2002-03-26  

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