A 500 kV Photoemission Electron Gun for the CEBAF FEL

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The proposed FELs at CEBAF require an electron source delivering 120 pC bunches at a repetition rate of 7.485 MHz, corresponding to an average current of 0.9 mA. To meet this requirement we will employ a 500 kV DC photoemission electron gun to produce nominal 100 psec bunches of modest peak current. The subsequent injector system will bunch and accelerate this beam, producing 60 A, 2 psec bunches for the FELs. The photoemission gun will use a negative electron affinity GaAs photocathode, which provides good quantum efficiency and an adequate temporal response. The optical beam will be provided by a ... continued below

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page(s) 410

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Sinclair, Charles August 1, 1991.

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The proposed FELs at CEBAF require an electron source delivering 120 pC bunches at a repetition rate of 7.485 MHz, corresponding to an average current of 0.9 mA. To meet this requirement we will employ a 500 kV DC photoemission electron gun to produce nominal 100 psec bunches of modest peak current. The subsequent injector system will bunch and accelerate this beam, producing 60 A, 2 psec bunches for the FELs. The photoemission gun will use a negative electron affinity GaAs photocathode, which provides good quantum efficiency and an adequate temporal response. The optical beam will be provided by a frequency doubled Nd:YLF laser system, actively mode locked to a subharmonic of the fundamental accelerator frequency. The principal technical difficulties associated with an electron source of this type involve the operating lifetime of the photocathode, and the operation of a high voltage gun in the presence of the alkali metals necessary to produce the photocathode. Various design a

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page(s) 410

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  • Report No.: CEBAF-PR-91-35
  • Grant Number: AC05-84ER40150
  • DOI: 10.2172/954225 | External Link
  • Office of Scientific & Technical Information Report Number: 954225
  • Archival Resource Key: ark:/67531/metadc934727

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Creation Date

  • August 1, 1991

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 2, 2016, 6:49 p.m.

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Sinclair, Charles. A 500 kV Photoemission Electron Gun for the CEBAF FEL, report, August 1, 1991; [Newport News, Virginia]. (digital.library.unt.edu/ark:/67531/metadc934727/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.