KAERI, Daejon
BNL, Upton, Long Island, New York
The 100-MeV proton linac of the proton engineering frontier project (PEFP) can be used as an injector of a rapid cycling synchrotron (RCS). The design study of the RCS is in process. The main purpose of the RCS is a spallation neutron source. The initial beam power is 60 kW where the injection and extraction energies are 100 MeV and 1 GeV, respectively. It will be extended to 500 kW through the upgrades of the injection energy to 200 MeV, the extraction energy to 2-GeV, and the repetition rate from 15 Hz to 30 Hz. The slow extraction option is also included in the design for basic and applied science researches. This work summarized the present design status of the PEFP RCS.
KAERI, Daejon
A beam dump for 20 MeV, 4.8mA proton beam had been manufactured in KAERI. The 20 MeV beam dump was made of graphite to reduce radioactivity by the materials around the beam dump as well as the beam dump itself. The beam dump was designed to by placing two plates of 30 cm by 60 cm at an angle of 12 degree. The IG430 graphite and OFHC copper were brazed with TiCuSil filler metal for cooling. The proton beam was assumed to be expanded for the peak heat flux in the graphite to be less than 200 W/cm2. The beam dump designed for maximum temperatures of graphite, copper and cooling water to be less than 223, 146 and 85 celsius degrees, respectively. The activation analysis of the beam dump was also performed with MCNP code. The sensitivity analyses of graphite tensile stresses to optimize the thicknesses of graphite with copper brazing were performed with ANSYS code. The tensile stress of graphite during the brazing process was the smallest around 1 cm thickness of graphite. A 100 MeV proton beam dump was designed with copper. The optimal angles between two copper plates for the minimum peak heat fluxes are 10~20 degrees. The peak heat flux in the copper plates at 15 degree is 333 W/cm2.