An activation analysis of the beam dump of KOMAC

The beam dump for the Korea Multipurpose Accelerator Complex (KOMAC) has been designed to reduce its activities through using graphite brazed by copper for a cooling. The residual activities of the beam dump by 20 MeV protons and the secondary neutrons were calculated. The residual activities by the protons were very large initially but they rapidly decreased. The copper activities by the secondary neutrons are dominant after a cooling for 5 h until about six cooling days. The beam dump of the graphite–copper can reduce the activation by more than several hundred times that of the copper beam dump.