RF Guns for Generation of Polarized Electron Beams

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Several accelerators, including the SLC, JLAB, Mainz, Bates/MIT, and Bonn have successfully operated for medium and high energy physics experiments using polarized electron beams generated by dc-biased guns employing GaAs photocathodes. Since these guns have all used a bias on the order of 100 kV, the longitudinal emittance of the extracted bunch is rather poor. Downstream rf bunching systems increase the transverse emittance. An rf gun with a GaAs photocathode would eliminate the need for separate rf bunchers, resulting in a simpler injection system. In addition, the thermal emittance of GaAs-type cathodes is significantly lower than for other photocathode materials. ... continued below

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5 pages

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Clendenin, J.E.; Brachmann, A.; Dowell, D.H.; Garwin, E.L.; Ioakeimidi, K.; Kirby, R.E. et al. November 9, 2005.

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Several accelerators, including the SLC, JLAB, Mainz, Bates/MIT, and Bonn have successfully operated for medium and high energy physics experiments using polarized electron beams generated by dc-biased guns employing GaAs photocathodes. Since these guns have all used a bias on the order of 100 kV, the longitudinal emittance of the extracted bunch is rather poor. Downstream rf bunching systems increase the transverse emittance. An rf gun with a GaAs photocathode would eliminate the need for separate rf bunchers, resulting in a simpler injection system. In addition, the thermal emittance of GaAs-type cathodes is significantly lower than for other photocathode materials. The environmental requirements for operating activated GaAs photocathodes cannot be met by rf guns as currently designed and operated. These requirements, including limits on vacuum and electron back bombardment, are discussed in some detail. Modifications to actual and proposed rf gun designs that would allow these requirements to be met are presented.

Physical Description

5 pages

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  • Invited talk at 36th ICFA Advanced Beam Dynamics Workshop (NANOBEAM 2005), Kyoto, Japan, 17-21 Oct 2005

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  • Report No.: SLAC-PUB-11526
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878019
  • Archival Resource Key: ark:/67531/metadc880475

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  • November 9, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 9:37 p.m.

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Clendenin, J.E.; Brachmann, A.; Dowell, D.H.; Garwin, E.L.; Ioakeimidi, K.; Kirby, R.E. et al. RF Guns for Generation of Polarized Electron Beams, article, November 9, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc880475/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.