ICONE11-36485 R & D Status of Superconducting Proton Linear Accelerator for ADS at JAERI

An accelerator driven nuclear transmutation system (ADS) requires high intensity proton beam; the energy is about 1GeV and the beam power is several tens MW. A superconducting proton linear accelerator is most promising option to provide the high power proton beam. R&D of the superconducting proton linear accelerator began in 1995 at JAERI in collaboration with High Energy Accelerator Research Organization (KEK). As the first step of the R&D, 600MHz superconducting single-cell and 5-cell cavities of beta (ratio of the beam velocity to the light velocity)=0.5,0.6 and 0.9 were fabricated and tested. Surface peak fields (Esp) of the cavity up to 51 and 40 MV/m were obtained at 2K for the single-cell and 5-cell cavities, respectively. The results are good enough for utilization of a high intensity proton accelerator. As the next step of the R&D work, prototype cryomodule has been fabricated in order to demonstrate the cavity performance in the cryomodule. The cryomodule includes two 5-cell cavities of beta=0.6 and is designed to perform 2K operation. Assembly and installation of the cavities in the cryomodule were carried out in the clean room to avoid dust contamination. The design field strength of Esp=16MV/m were obtained in the preliminary test of the cryomodule. The High Intensity Proton Accelerator Project is promoting by JAERI and KEK. A superconducting proton linear accelerator is planned in the energy range from 400 to 600 MeV. The proton beams of 600 MeV will be delivered to the Transmutation Experimental Facility. System design of the superconducting proton linac has been carried out; a cryomodule includes two 972MHz 9-cell cavities and 11 cryomodules are necessary for the acceleration from 400 to 600 MeV at Esp=30 MV/m. Total length of the superconducting linear accelerator is designed to be 58m.