Beam Dump Design for the In-flight Fragment Separator Using High-power Beam*

The beam dump is a critical component for the in-flight fragment separator using high-power primary beams at the rare isotope science project (RISP) in Korea. The maximum beam power is planned to be 400 kW, and a third of the primary beam power deposits at the isotope production target and the rest are dissipated at the beam dump. The beam dump is designed to be a rotating water drum, which is movable in the perpendicular direction to the beam to select the isotope beam of interest. The main primary ion beam is U, and its range at the energy of 200 MeV/u is only a couple of mm after passing through the shell structure of the drum. This short range requires its internal structure to confine water flow on the wall and to keep high-pressure. Some detailed thermo-mechanical and thermo-fluid analysis has been done using ANSYS and other codes.