Ion-induced gamma-ray detection of fast ions escaping from fusion plasmasa

A 12 × 12 pixel detector has been developed and used in a laboratory experiment for lost fast-ion diagnostics. With gamma rays in the MeV range originating from nuclear reactions 9Be(α, nγ)12C, 9Be(d, nγ)12C, and 12C(d, pγ)13C, a high purity germanium (HPGe) detector measured a fine-energy-resolved...

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Bibliographic Details
Published in:Review of scientific instruments 2014-11, Vol.85 (11)
Main Authors: Nishiura, M, Doi, K, Taniike, A, Matsuki, T, Shimazoe, K, Mushiake, T, Yoshino, M, Nagasaka, T, Fujimoto, Y, Fujioka, K, Tanaka, T, Kisaki, M, Yamaoka, H, Matsumoto, Y, Wada, M
Format: Article
Language:English
Subjects:
Background radiation
Carbon 12
Collimation
Energy measurement
Energy spectra
Food irradiation
Gamma rays
Image reconstruction
Nuclear reactions
Pixels
Scientific apparatus & instruments
Sensors
Shape recognition
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Summary:A 12 × 12 pixel detector has been developed and used in a laboratory experiment for lost fast-ion diagnostics. With gamma rays in the MeV range originating from nuclear reactions 9Be(α, nγ)12C, 9Be(d, nγ)12C, and 12C(d, pγ)13C, a high purity germanium (HPGe) detector measured a fine-energy-resolved spectrum of gamma rays. The HPGe detector enables the survey of background-gamma rays and Doppler-shifted photo peak shapes. In the experiments, the pixel detector produces a gamma-ray image reconstructed from the energy spectrum obtained from total photon counts of irradiation passing through the detector's lead collimator. From gamma-ray image, diagnostics are able to produce an analysis of the fast ion loss onto the first wall in principle.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4886764