[2L14-16] Fusion Neutronics

[2L14] Development of a pulse shape discrimination using single crystal CVD diamond detector for fast neutron measurement

*Makoto Inami Kobayashi^1,2, Sachiko Yoshihashi³, Kunihiro Ogawa^1,2, Mitsutaka Isobe^1,2, Shuji Kamio¹, Yutaka Fujiwara¹, Siriyaporn Sangaroon¹, Akira Uritani³, Masaki Osakabe^1,2 (1. National Institute for Fusion Science, 2. SOKENDAI, 3. Nagoya Univ.)

Keywords:Neutron, Diamond detector

The single crystal diamond detector is a candidate as a real-time fast neutron monitor in the fusion reactor. However, due to the sensitivity for incident gamma-ray and energetic ions associated with fast neutron, the appropriate discrimination of pulses by fast neutron from those by other radiations is necessary. In this study, a pulse shape discrimination method was developed for a single crystal CVD diamond detector on fast neutron measurement.
The characteristics of pulse shape induced by fast neutron were quantified using pulse-width, total-charge, similarity and Euclid distance to the typical pulse shape. In particular, the event, where the energy of fast neutron deposits at the center of diamond gives a narrow rectangular pulse, was adopted for fast neutron measurement.