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Fast neutron-gamma discrimination on neutron emission profile measurement on JT-60U
K Ishii1, K Shinohara, M Ishikawa
1Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan. keiichi.ishii@ppl2.qse.tohoku.ac.jp
Abstract:
A digital signal processing (DSP) system is applied to stilbene scintillation detectors of the multichannel neutron emission profile monitor in JT-60U. Automatic analysis of the neutron-γ pulse shape discrimination is a key issue to diminish the processing time in the DSP system, and it has been applied using the two-dimensional (2D) map. Linear discriminant function is used to determine the dividing line between neutron events and γ-ray events on a 2D map. In order to verify the validity of the dividing line determination, the pulse shape discrimination quality is evaluated. As a result, the γ-ray contamination in most of the beam heating phase was negligible compared with the statistical error with 10 ms time resolution.
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