Abstract
The sciences of laser produced neutron sources, including the laser-fusion, the laser photonuclear
neutron generation, the neutron generation via p-Li or p-Be reaction by using laser accelerated protons,
require neutron diagnostic tools which were specifically designed for a hard X-ray background
environment. Especially in the kJ class ultra-intense laser facility such as LFEX, the X-ray energy
exceeds tens of MeV. They create a large number of photonuclear neutron from the surrounding
constructions such as vacuum chamber. In this paper the development of neutron time of
flight(TOF)detector is described. The neutron detector is constructed with a fast response liquid
scintillator and a gated-photomultiplier tube, and they are shielded from background neutrons by means
of a concrete collimator.
