High-Yield Metal Materials for Photocathode RF Gun
Conference
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OSTI ID:629299
- Brookhaven National Lab., Upton, NY (United States)
- Stanford Linear Accelerator Center, Menlo Park, CA (United States)
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.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 629299
- Report Number(s):
- BNL--65002; CONF-970885--; ON: DE98002640; BR: KA3010000
- Country of Publication:
- United States
- Language:
- English
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