A Polarized Electron RF Photoinjector Using the Plane-Wave-Transformer (PWT) Design

Details A Polarized Electron RF Photoinjector Using the Plane-Wave-Transformer (PWT) Design A Polarized Electron RF Photoinjector Using the Plane-Wave-Transformer (PWT) Design

2002-05-03

arxiv.org/abs/physics/0205009v1

Physics

Accelerator Physics

14 pages, 5 figures, to be submitted to PRST-AB

Scientific paper

Polarized electron beams are now in routine use in particle accelerators for nuclear and high energy physics experiments. These beams are presently produced by dc-biased photoelectron sources combined with rf chopping and bunching systems with inherently high transverse emittances. Low emittances can be produced with an rf gun, but the vacuum environment has until now been considered too harsh to support a negative electron affinity GaAs photocathode. We propose to significantly improve the vacuum conditions by adapting a PWT rf photoinjector to achieve reasonable cathode emission rates and lifetimes. This adaptation can also be combined with special optics that will result in a flat beam with a normalized rms emittance in the narrow dimension that may be as low as 10-8 m.

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