Introduction of a Dual Injection Tube for the Design of a 20 MW Lead-Bismuth Target System

Abstract

A spallation target system is a key component in the development of an accelerator-driven system (ADS). It is known that a 15-25 MW spallation target is required for a practical 1 000 MWth ADS. The design of a 20 MW spallation target is very challenging because more than 60% of the beam power is deposited as heat in a small volume of the target system. In the present work, a numerical design study was performed to obtain the optimal design parameters of a 20 MW spallation target for a 1 000 MWth ADS. A dual injection tube was proposed for the reduction of the LBE flow rate at the target channel. The results of the present study show that a 30-cm wide proton beam with a uniform beam distribution should be adopted for the spallation target of a 20 MW power. When the dual LBE injection tube is employed, the LBE flow rate is reduced by a factor of four without reducing the maximum allowable beam current.