Speaker
Description
Fast and precise beam polarimeters are crucial for both accelerator tuning and spin-observable extraction. The statistical precision of a polarimeter is dominated by the figure-of-merit (FOM), i.e. the cross section multiplied by the physical asymmetry squared, of its reference reaction. The High Intensity heavy-ion Accelerator Facility (HIAF) and the polarized Electron Ion collider in China (EicC) are future large-scale scientific facilities being constructed and planned by the Chinese physics community. Spin-polarized physics programs are planned at both the facilities. The maximum proton beam energies at HIAF and EicC are 26 GeV/c and 9.3 GeV/c respectively. In this energy range, the FOM of the proton-electron (pe) elastic scattering is much larger than that of the proton-proton elastic scattering, which has been widely used for proton beam polarimetry. In addition, all observables of the pe scattering can be calculated exactly with QED. These two features make the pe elastic scattering perfect for beam polarimeters at the HIAF and EicC. This talk will report our feasibility study and design of a beam polarimeter based on double polarized pe elastic scattering.
