Speaker
Description
Nuclear physics experiments requiring highly spin polarized positron beams are now proposed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory (JLab). To achieve this, a new polarized positron injector is imagined, where the positron beam polarization is derived from the bremsstrahlung of an intense continuous-wave (CW) spin polarized electron beam produced by strained super-lattice GaAs/GaAsP photocathodes in a high voltage DC photo gun.
This presentation describes the polarized positron injector and its integration to CEBAF 12 GeV, in particular the three important stages of positron beam delivery: polarized electron injector, positron target and collection beam line, and positron injection and transport within CEBAF. The requirements on the polarized electron source sustaining high ~mA beam intensity and on the positron conversion target operating >50 kW are especially demanding. The collection and compression of a CW positron beam will be unique.
Acknowledgement
Notice: Authored by Jefferson Science Associates under U.S. DOE Contract No. DE-AC05-84ER40150. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for U.S. Government purposes.
| Category | Polarized Sources |
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