A source for polarized positron beams at the Continuous Electron Beam
Accelerator Facility (CEBAF) at Jefferson Lab is being designed. The Polarized
Electrons for Polarized Positrons (PEPPo) concept is used to produce polarized
e+e−-pairs from the bremsstrahlung radiation of a longitudinally
polarized electron beam interacting within a high-Z conversion target. The
scheme under consideration includes a 4 mm thick tungsten target that absorbs
17 kW deposited by a 1 mA continuous-wave electron beam with an energy of 120
MeV. The concept of a rotating tungsten rim mounted on a water-cooled copper
disk was explored. The results of ANSYS thermal and mechanical analyses are
discussed together with FLUKA evaluations of the radiation damages.Comment: 14th International Particle Accelerator Conference (IPAC'23