PSD10: 10th International Conference on Position Sensitive Detectors

Evaluation of two-dimensional multiwire neutron detector with individual line readout under pulsed neutron irradiation

11 Sept 2014, 14:00

1h 40m

University of Surrey

Poster Presentation Detectors for Neutron facilities Session 13: Posters 2 (Astrophysics, Synchroton and other Applications)

Speaker

Dr Kentaro Toh (Japan Atomic Energy Agency)

Description

A multiwire-type two-dimensional neutron detector system using individual line readout and optical signal transmission method is developed for use in the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J=PARC). The sensitive area was 128 × 128 mm² with a pitch of 1 mm in both directions (x and y), and the 256 signal lines are individually readout by signal-processing electronics. First irradiation experiments using pulsed neutrons are performed at the J-PARC/MLF. The developed detector could determine time-of-flight spectra and time-resolved two-dimensional images accurately with time range from 0 to 40 ms that arise from 25-Hz pulsed neutrons. The detector system exhibits a gamma-ray signals of 3.27 × 10^-3 counts/pulse/(sensitive area), a deviation of position linearity less than 0.5%, and a spatial response of 1.8 mm full width at half-maximum. Finally, the validity of the detector system is confirmed by a neutron reflectometry using Ni/Ti multilayer.