A 90-GHz Photoinjector

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Photocathode rf guns depend on mode locked laser systems to produce an electron beam at a given phase of the rf. In general, the laser pulse is less than {sigma}{sub z} = 10{sup o} of rf phase in length and the required stability is on the order of {Delta}{phi} = 1{sup o}. At 90 GHz (W-band), these requirements correspond to {sigma}{sub z} = 333 fsec and {Delta}{phi} = 33 fsec. Laser system with pulse lengths in the fsec regime are commercially available, the timing stability is a major concern. We propose a multi-cell W-band photoinjector that does not require a ... continued below

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Palmer, D.T.; Hogan, M.J.; /SLAC; Ferrario, M.; Serafini, L. & /Frascati /INFN, Milan September 12, 2005.

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Photocathode rf guns depend on mode locked laser systems to produce an electron beam at a given phase of the rf. In general, the laser pulse is less than {sigma}{sub z} = 10{sup o} of rf phase in length and the required stability is on the order of {Delta}{phi} = 1{sup o}. At 90 GHz (W-band), these requirements correspond to {sigma}{sub z} = 333 fsec and {Delta}{phi} = 33 fsec. Laser system with pulse lengths in the fsec regime are commercially available, the timing stability is a major concern. We propose a multi-cell W-band photoinjector that does not require a mode locked laser system. Thereby eliminating the stability requirements at W-band. The laser pulse is allowed to be many rf periods long. In principle, the photoinjector can now be considered as a thermionic rf gun. Instead of using an alpha magnet to compress the electron bunch, which would have a detrimental effect on the transverse phase space quality due to longitudinal phase space mixing, we propose to use long pulse laser system and a pair of undulators to produce a low emittance, high current, ultra-short electron bunch for beam dynamics experiments in the 90 GHz regime.

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  • Contributed to IEEE Particle Accelerator Conference (PAC 99), New York, 29 Mar - 2 Apr 1999

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  • Report No.: SLAC-PUB-11476
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878446
  • Archival Resource Key: ark:/67531/metadc877134

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  • September 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 1:38 p.m.

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Palmer, D.T.; Hogan, M.J.; /SLAC; Ferrario, M.; Serafini, L. & /Frascati /INFN, Milan. A 90-GHz Photoinjector, article, September 12, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877134/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.