Design of a Target System for an e-Linac-Based 6 MeV SS-ADS Neutron Source

Abstract

This research aims to identify the optimal target design for generating neutrons using a 6 MeV electron linear accelerator (e-Linac) within the Small Scale - Accelerator Driven System (SS-ADS) experimental facility of ⁹⁹Mo isotope production. The methodology employs particle transport simulations using the Particle and Heavy Ion code Transport System (PHITS), combined with Response Surface Methodology (RSM) for statistical optimization. With a beam radius of 0.1 cm, the optimal target system for the 6 MeV e-Linac incorporates an iridium pitcher and a beryllium catcher (Ir-Be) configuration. The optimal radius and thickness dimensions of the pitcher are 0.1 cm and 0.21 cm respectively, while the catcher should have a radius and thickness of 1 cm each. This Ir-Be target system configuration design can produce a total neutron flux of 3.85 10⁶ n/cm².s.µA. Since the external neutron source requirement for experimental SS-ADS is on the order of 10⁸ n/cm2.s, the design plan of 6 MeV e-Linac should have an electron current of 0.1 mA.