Design of 100 Mev Proton Beam Irradiation Facility for the Pefp 100 Mev Linac *

The Proton Engineering Frontier Project (PEFP) will install a 100-MeV proton linear accelerator at Gyeong-ju site. For the beam commissioning of 100 MeV proton linac, the two target rooms (TR 103, TR 23) will be prepared as a starter among 10 target room. To design the irradiation equipment in TR 103, we have investigated general propagation shape and spatial distribution of proton beam, when 100 MeV proton beam extracted from vacuum in the beam lines through beam window by Monte carlo method. On the basis of this result, we have designed beam irradiation components and their configuration. The beam irradiation facility consist of beam window, beam dump, support frame, sample support and beam current monitor. To minimize residual radioactivity induced by incident proton beam, the pure aluminum was selected as the material of beam dump and the aluminum alloy was selected as material of other irradiation equipment. This residual radioactivity of equipment was estimated by Monte carlo method. In this paper, the details of this irradiation equipment design are presented. INTRODUCTION The PEFP 100-MeV proton linear accelerator has been developed and will be installed at Gyeong-ju site [1-2]. The 20-MeV or 100-MeV proton beam will be supplied to users who want to utilize proton beams for their own research and development. To meet user’s demand, the PEFP will construct a ten target rooms which each of them have own characteristics. But, for the beam commissioning of 100-MeV proton linac, the two target rooms (TR 103, TR 23) will be prepared as a starter among 10 target rooms. The TR 103 target room will be used for 100 MeV proton beam commissioning at the early stage of the accelerator operation. Therefore, the design of irradiation equipment in the target room was focused on the radiation safety, the beam observation and the beam current monitoring.specification The layout of two target room is shown as figure 1. Two target rooms have 4 × 4 × 3 m space, they are enclosed the concrete shielding wall. The most of the construction work of the target room was completed, but the remaining construction works are still conducting. Figure 2 shows the construction status of the target room. The proton beams are transported though the beamline to the target room, they are spread out by the octupole magnet up to 300 mm in the target room to provide the large and uniform proton beams to users. Table 1 shows the general specification of the target room. Figure 1: Layout of 100 MeV proton linac. Table 1: Specification of Target Room