The multi-physics field analysis of a dual-beam drift tube linac

Abstract

Abstract An 81.25 MHz dual-beam drift tube linac (DB-DTL) is being designed to prove the feasibility of multi-beam type linac. The beam dynamics design and electromagnetic calculation have been completed [1]. The following step is the multi-physics field analysis of the DB-DTL, including RF electromagnetic simulation, thermal simulation and structural simulation, which is very important for the DB-DTL safe operation. The RF power dissipation will make the cavity temperature rise and cause cavity resonance frequency shifts due to the deformation of cavity structure. The distributions of cavity deformation and stress are calculated according to the cavity temperature map. All the simulation results, including cavity temperature rise, deformation and stress and the frequency shifting, should be within an acceptable range. In this paper, the detailed multi-physics analysis of the DB-TL will be presented.