CEBAF 200 kV Inverted Electron Gun

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Two DC high voltage GaAs photoguns have been built at Jefferson Lab based on a compact inverted insulator design. One photogun provides the polarized electron beam at CEBAF and operates at 130 kV bias voltage. The other gun is used for high average current lifetime studies at a dedicated test facility and has been operated at bias voltage up to 225 kV. The advantages of higher DC voltage for CEBAF include reduced space-charge emittance growth and the potential for prolonged photocathode lifetime. However, a consequence of operating at higher voltages is the increased likelihood of field emission or breakdown, both ... continued below

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J.M. Grames, P.A. Adderley, J. Clark, J. Hansknecht, M. Poelker, M.L. Stutzman, R. Suleiman, K.E.L. Surles-Law March 1, 2011.

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Two DC high voltage GaAs photoguns have been built at Jefferson Lab based on a compact inverted insulator design. One photogun provides the polarized electron beam at CEBAF and operates at 130 kV bias voltage. The other gun is used for high average current lifetime studies at a dedicated test facility and has been operated at bias voltage up to 225 kV. The advantages of higher DC voltage for CEBAF include reduced space-charge emittance growth and the potential for prolonged photocathode lifetime. However, a consequence of operating at higher voltages is the increased likelihood of field emission or breakdown, both of which are unacceptable. Highlights of the R&D studies leading toward a production 200keV GaAs photogun for CEBAF will be presented.

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  • 2011 Particle Accelerator Conference (PAC'11), New York, NY, 28 Mar - 1 Apr 2011

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  • Report No.: JLAB-ACC-11-1328
  • Report No.: DOE/OR/23177-1609
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1032458
  • Archival Resource Key: ark:/67531/metadc835518

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  • March 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:18 p.m.

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J.M. Grames, P.A. Adderley, J. Clark, J. Hansknecht, M. Poelker, M.L. Stutzman, R. Suleiman, K.E.L. Surles-Law. CEBAF 200 kV Inverted Electron Gun, article, March 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc835518/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.