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
| Project/Area Number |
11480111
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | University of Tsukuba |
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Principal Investigator |
CHO Teruji Univ.Tsukuba, Institute of Physics, Professor, 物理学系, 教授 (80171958)
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| 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)
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| Project Period (FY) |
1999 – 2000
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| Keywords | Neutron Diagnostics / Neutron Damage / Fusion Produced Neutrons / High Temperature Plasmas / Synchrotron Radiation / Cyclotron Accelerator / Scaling Law / Semiconductor Detector |
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| 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.
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