Progress on a cryogenically cooled RF gun polarized electron source

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RF guns have proven useful in multiple accelerator applications. An RF gun capable of producing polarized electrons is an attractive electron source for the ILC or an electron-ion collider. Producing such a gun has proven elusive. The NEA GaAs photocathode needed for polarized electron production is damaged by the vacuum environment in an RF gun. Electron and ion back bombardment can also damage the cathode. These problems must be mitigated before producing an RF gun polarized electron source. In this paper we report continuing efforts to improve the vacuum environment in a normal conducting RF gun by cooling it with ... continued below

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3 pages

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Fliller, R. P., III & Edwards, H. August 1, 2006.

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RF guns have proven useful in multiple accelerator applications. An RF gun capable of producing polarized electrons is an attractive electron source for the ILC or an electron-ion collider. Producing such a gun has proven elusive. The NEA GaAs photocathode needed for polarized electron production is damaged by the vacuum environment in an RF gun. Electron and ion back bombardment can also damage the cathode. These problems must be mitigated before producing an RF gun polarized electron source. In this paper we report continuing efforts to improve the vacuum environment in a normal conducting RF gun by cooling it with liquid nitrogen after a high temperature vacuum bake out. We also report on a design of a cathode preparation chamber to produce bulk GaAs photocathodes for testing in such a gun. Future directions are also discussed.

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3 pages

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  • Presented at 2006 Linear Accelerator Conference (LINAC 06), Knoxville, Tennessee, 21-25 Aug 2006

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  • Report No.: FERMILAB-CONF-06-273-AD
  • Grant Number: AC02-07CH11359
  • Office of Scientific & Technical Information Report Number: 897047
  • Archival Resource Key: ark:/67531/metadc891116

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  • August 1, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 26, 2017, 6:37 p.m.

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Fliller, R. P., III & Edwards, H. Progress on a cryogenically cooled RF gun polarized electron source, article, August 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc891116/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.