Concepts of 220-MeV microtron for non-destructive nuclear material detection system

A nuclear material detection system (NMDS) based on neutron/γ-ray hybrid approach has been proposed for the container inspection at sea ports [1, 2]. While neutron is to be used for a fast pre-screening, quasi-monochromatic γ-ray beam from the laser Compton scattering (LCS) source will be used for an isotope identification on the precise inspection of the cargoes. Nuclear resonance fluorescence method is going to be employed for the isotope identification because of its superiority in high selectivity and in high penetration capability through the shielding objects. In the system a high energy electron beam of good quality is required for LCS. Racetrack microtron (RTM) is one of the most promising candidates as an electron source for such the practical use. Some design parameters suitable for such RTM are shown together with the expected output beam qualities.