Neutron Detectors Array System for ICF Experiments

A very Sensitive Neutron Spectrometer (SNS) is designed for SG-III prototype laser facility in China. The spectrometer consists of a 960 channel single-neutron-interaction detector array placed 16.67m from the Inertial Confinement Fusion (ICF) target. Each detector channel has a plastic scintillator coupled to a photomultiplier tube followed by a discriminator, shaper, TDC and ADC to allow the measurement of neutron arrival time as well as pulse amplitude. The array is capable of measuring yields as low as 4¥105 neutrons (100 detected hits) with resolution of1.0 ns (90keV for 14-MeV neutrons with 16.67m flight path). Details of design and testing will be presented.