Preliminary design of a beam dump for the high-energy proton accelerator of PEFP

The proton energy and the average current of the Korean Multipurpose Accelerator are 100 MeV and 1.6 mA, respectively, for a beam power of 160 kW. To absorb such a high energy, a beam dump should be designed such that the beam is spreaded as widely as possible on a given dump surface area. Also, an efficient cooling system needs to be installed. In this paper, the design concept of a 100 MeV PEFP beam dump to safely absorb a proton beam energy is presented. For a selection of the beam dump material, a 100 MeV proton power density distribution analysis, a stopping range calculation, a neutron and photon yield analysis, and a residual activity analysis were carried out for six different materials: water, graphite, copper, nickel iron, and aluminum. For the structural integrity assessment, an erosion test and a bending test for a nickel-coated surface, as well as a preliminary heat transfer analysis and a thermal stress analysis, were also carried out. The results show that copper is a relatively better material for the 100 MeV beam dump in view of its residual activity and that the designed beam dump is structurally safe.