Speaker
Description
In this work, we report simulation results for the positron yield and polarization of polarized electron beams incident on GaInSn and PbBi liquid metal targets. One of the proposed upgrades to 12 GeV CEBAF is the use of a continuous wave polarized positron beam for physics experiments. Because of their heat dissipation capabilities, high-Z liquid metal jets are excellent candidates for positron production targets. Polarized positron beams can be generated from a primary electron beam incident on thick high-Z targets through circular polarized bremsstrahlung conversion to linearly polarized pair production. This polarization transfer from the primary electron beam has been previously demonstrated at JLab in the PEPPo experiment with a solid target and low energy. Here we report GEANT4 simulations for 10 and 120 MeV electron beams incident on GaInSn and PbBi liquid metal targets. These simulations are compared to simulations with a solid tungsten target, as well as with the PEPPo results and with unpolarized simulations using MCNP6.
