RADIATION TRANSPORT AND PROTECTION CALCULATION FOR THE IN-FLIGHT FRAGMENT SEPARATOR FACILITY OF RARE ISOTOPE SCIENCE PROJECT IN THE REPUBLIC OF KOREA

A rare-isotope accelerator facility is planned to be constructed in the Republicof Korea, named as Rare Isotope Science Project (RISP). The facility containsthree accelerators: a heavy-ion superconducting linear accelerator as the driverfor the in-flight fragment separator (IF) system, a proton cyclotron for theisotope separation on-line (ISOL) system and a superconducting linac forsecondary beam acceleration. The driver accelerator will provide uranium beamfor the IF system up to 200 MeV/u at a maximum beam power of 400 kW, and thecyclotron a 70-MeV proton beam at 70 kW. The IF system consists of pre-and mainseparators. An isotope beam of interest is separated in the pre-separator, andthen purified for identification in the main separator. A main function of pre-separator is to remove the primary and unwanted fragments by stopping them at abeam dump. Due to the high beam power, it is important to evaluate radiationtransport and shielding especially in the pre-separator area. Heat depositionand radiation dose rate in the components of pre-separator have been estimatedusing PHITS.