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Description
A 280-MeV electron linear accelerator has been designed to expand the research capabilities and applications of high-energy electron beams in Thailand. For commissioning and energy verification, two dedicated beam dumps are positioned downstream of the bending magnet. This work presents the simulation-based design and optimization of these beam dumps using the PHITS Monte Carlo radiation transport code. Different material configurations and geometries were evaluated to reduce prompt radiation and suppress secondary particle leakage. A multilayer structure combining high-Z and low-Z materials was found to provide effective energy absorption while confining photon and neutron secondaries within the shielding volume. The resulting radiation field in the tunnel meets all applicable safety criteria and regulatory limits. These results establish the validated baseline design for the beam dumps and support their transition to detailed engineering and fabrication.
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