High-Yield Metal Materials for Photocathode RF Gun

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Significant progress has been made in both improving the quantum efficiency and understanding the physics process of photoemission of metal photocathode materials under high electric field. Metal material, copper and magnesium were installed on the photocathode RF gun, and experimentally investigated using frequency quadrupled Nd:Yag laser (266 nm). A systemic procedure was developed for preparing cathode; this involves diamond polishing, ultrasonic cleaning and high temperature vacuum bake out. Using laser cleaning and explosive electron emission cleaning, the highest quantum efficiency measured for copper and magnesium are 0.02% and 0.3%, respectively. The Schottky effect was experimental investigated, the quantum efficiency of ... continued below

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6 p.

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Wang, X. J.; Ben-Zvi, I.; Smedley, J.; Srinivasan-Rao, T.; Woodle, M.; Palmer, D. T. et al. November 1997.

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Description

Significant progress has been made in both improving the quantum efficiency and understanding the physics process of photoemission of metal photocathode materials under high electric field. Metal material, copper and magnesium were installed on the photocathode RF gun, and experimentally investigated using frequency quadrupled Nd:Yag laser (266 nm). A systemic procedure was developed for preparing cathode; this involves diamond polishing, ultrasonic cleaning and high temperature vacuum bake out. Using laser cleaning and explosive electron emission cleaning, the highest quantum efficiency measured for copper and magnesium are 0.02% and 0.3%, respectively. The Schottky effect was experimental investigated, the quantum efficiency of the Cu is dominated by the Schottky effect since the work function of the copper is almost equal to the photon energy used (4.66 eV). The quantum efficiency of the magnesium is significant enhanced by the Schottky effect.

Physical Description

6 p.

Notes

OSTI as DE98002640

Medium: P; Size: 6 p.

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  • FEL `97: international free electron laser conference and 4. free electron laser users` workshop, Beijing (China), 18-22 Aug 1997

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  • Other: DE98002640
  • Report No.: BNL--65002
  • Report No.: CONF-970885--
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 629299
  • Archival Resource Key: ark:/67531/metadc693177

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  • November 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 13, 2017, 12:41 p.m.

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Wang, X. J.; Ben-Zvi, I.; Smedley, J.; Srinivasan-Rao, T.; Woodle, M.; Palmer, D. T. et al. High-Yield Metal Materials for Photocathode RF Gun, article, November 1997; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc693177/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.