The Los Alamos Photoinjector Program

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Description

Free-electron lasers (FELS) require electron beams of high peak brightness. In this presentation, we describe the design of a compact high-brightness electron source for driving short-wavelength FELs. The experiment uses a laser-illuminated Cs/sub 3/Sb photoemitter located in the first rf cavity of an injector linac. The photocathode source and associated hardware are described. The doubled YAG laser (532 nm), which is used to drive the photocathode, produces 75-ps micropulses at 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 ... continued below

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Pages: 18

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Sheffield, R.L.; Gray, E.R. & Fraser, J.S. September 1, 1987.

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Description

Free-electron lasers (FELS) require electron beams of high peak brightness. In this presentation, we describe the design of a compact high-brightness electron source for driving short-wavelength FELs. The experiment uses a laser-illuminated Cs/sub 3/Sb photoemitter located in the first rf cavity of an injector linac. The photocathode source and associated hardware are described. The doubled YAG laser (532 nm), which is used to drive the photocathode, produces 75-ps micropulses at 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 amplitude of 100 mA to 400 A, beam emittances ranging from 10 n.mm.mrad to 40 n.mm.mrad, an energy spread of +-3%, and peak current densities of 600 A/cm/sup 2/. A brief discussion on the possible applications of this very bright and compact electron source is presented. 16 refs., 5 figs., 1 tab.

Physical Description

Pages: 18

Notes

NTIS, PC A02/MF A01; 1.

Source

  • 9. international free-electron laser conference, Williamsburg, VA, USA, 14 Sep 1987

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  • Other: DE88000531
  • Report No.: LA-UR-87-3036
  • Report No.: CONF-8709110-5
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5983106 | External Link
  • Office of Scientific & Technical Information Report Number: 5983106
  • Archival Resource Key: ark:/67531/metadc1102629

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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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  • September 1, 1987

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 23, 2018, 12:25 p.m.

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Sheffield, R.L.; Gray, E.R. & Fraser, J.S. The Los Alamos Photoinjector Program, report, September 1, 1987; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1102629/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.