2002/05/03 by J.E. Clendenin, J. E. Clendenin, R. E. Kirby +6
Engineering · Medicine · Physics and Astronomy · #Accelerator Physics (physics.acc-ph) #FOS: Physical sciences #Gyrotron and Vacuum Electronics Research #Photocathodes and Microchannel Plates #Radiation Therapy and Dosimetry #physics.acc-ph
paper · pdf · doi:10.48550/arxiv.physics/0205009
14 pages, 5 figures, to be submitted to PRST-AB
arxiv created 2002/05/03 · openalex publication_date 2002/05/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.