Rf photoelectron gun experimental performance

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Free-electron lasers require electrons beams of high peak brightness. In this paper, we describe the performance of a compact high-brightness electron source for driving short-wavelength free-electron lasers. The experiment uses a laser-illuminated photoemitter located in the first rf cavity of a two-cavity linac. The photocathode source and associated hardware are described. The doubled ND:YAG laser (532 nm), which is used to drive the photocathode, produces 75-ps micropulses at a 108-MHz repetition rate and peak powers of approximately 300 kW. Diagnostics include a pepper-pot emittance analyzer, a magnetic spectrometer, and a <4-ps resolution streak camera. Present experiments give the following results: ... continued below

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Pages: 3

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Sheffield, R.L.; Cornelius, W.D.; Nguyen, D.C.; Springer, R.W.; Lamartine, B.C.; Gray, E.R. et al. January 1, 1988.

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Description

Free-electron lasers require electrons beams of high peak brightness. In this paper, we describe the performance of a compact high-brightness electron source for driving short-wavelength free-electron lasers. The experiment uses a laser-illuminated photoemitter located in the first rf cavity of a two-cavity linac. The photocathode source and associated hardware are described. The doubled ND:YAG laser (532 nm), which is used to drive the photocathode, produces 75-ps micropulses at a 108-MHz repetition rate and peak powers of approximately 300 kW. Diagnostics include a pepper-pot emittance analyzer, a magnetic spectrometer, and a <4-ps resolution streak camera. Present experiments give the following results: micropulse current amplitudes of 10 mA to 400 A, 75% beam emittances ranging from 10 /center dot/ mm /center dot/ mrad to 40 /center dot/ mm /center dot/ mrad and peak current densities of >600 A/cmS. Results on photocathode lifetime will be presented. Future plans for applications of the photoinjector at Los Alamos National Laboratory are discussed. 7 refs., 4 figs., 2 tabs.

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Pages: 3

Notes

NTIS, PC A02/MF A01 - OSTI; 1.

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  • Linear accelerator conference, Williamsburg, VA, USA, 3 Oct 1988

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  • Other: DE89005442
  • Report No.: LA-UR-88-3325
  • Report No.: CONF-881049-59
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 6790093
  • Archival Resource Key: ark:/67531/metadc1193650

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1988

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  • July 2, 2018, 10:52 p.m.

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  • Oct. 25, 2018, 3:24 p.m.

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Sheffield, R.L.; Cornelius, W.D.; Nguyen, D.C.; Springer, R.W.; Lamartine, B.C.; Gray, E.R. et al. Rf photoelectron gun experimental performance, article, January 1, 1988; United States. (digital.library.unt.edu/ark:/67531/metadc1193650/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.