DIAMOND AMPLIFIER FOR PHOTOCATHODES.

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We report a new approach to the generation of high-current, high-brightness electron beams. Primary electrons are produced by a photocathode (or other means) and are accelerated to a few thousand electron-volts, then strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The secondary electrons drift through the diamond under an electric field and emerge into the accelerating proper of the ''gun'' through a Negative Electron Affinity surface of the diamond. The advantages of the new approach include the following: (1) Reduction of the ... continued below

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13 pages

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RAO,T.; BEN-ZVI,I.; BURRILL,A.; CHANG,X.; HULBERT,S.; JOHNSON,P. D. et al. June 21, 2004.

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Description

We report a new approach to the generation of high-current, high-brightness electron beams. Primary electrons are produced by a photocathode (or other means) and are accelerated to a few thousand electron-volts, then strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The secondary electrons drift through the diamond under an electric field and emerge into the accelerating proper of the ''gun'' through a Negative Electron Affinity surface of the diamond. The advantages of the new approach include the following: (1) Reduction of the number of primary electrons by the large SEY, i.e. a very low laser power in a photocathode producing the primaries. (2) Low thermal emittance due to the NEA surface and the rapid thermalization of the electrons. (3) Protection of the cathode from possible contamination from the gun, allowing the use of large quantum efficiency but sensitive cathodes. (4) Protection of the gun from possible contamination by the cathode, allowing the use of superconducting gun cavities. (5) Production of high average currents, up to ampere class. (6) Encapsulated design, making the ''load-lock'' systems unnecessary. This paper presents the criteria that need to be taken into account in designing the amplifier.

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13 pages

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  • 11TH AAC WORKSHOP, STONY BROOK, NY (US), 06/21/2004--06/26/2004

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  • Report No.: BNL--73169-2004-CP
  • Grant Number: AC02-98CH10886
  • DOI: 10.1016/j.diamond.2003.11.052 | External Link
  • Office of Scientific & Technical Information Report Number: 15009620
  • Archival Resource Key: ark:/67531/metadc1412395

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Office of Scientific & Technical Information Technical Reports

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  • June 21, 2004

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  • Jan. 23, 2019, 12:54 p.m.

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RAO,T.; BEN-ZVI,I.; BURRILL,A.; CHANG,X.; HULBERT,S.; JOHNSON,P. D. et al. DIAMOND AMPLIFIER FOR PHOTOCATHODES., article, June 21, 2004; (https://digital.library.unt.edu/ark:/67531/metadc1412395/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.