Jefferson Lab IR demo FEL photocathode quantum efficiency scanner
Conference
·
OSTI ID:954830
Jefferson Laboratory's Free Electron Laser (FEL) incorporates a cesiated gallium arsenide (GaAs) DC photocathode gun as its electron source. By using a setof scanning mirrors, the surface of the GaAs wafer is illuminated with a 543.5nm helium-neon laser. Measuring the current flow across the biased photocathodegenerates a quantum efficiency (QE) map of the 1-in. diameter wafer surface. The resulting QE map provides a very detailed picture of the efficiency of thewafer surface. By generating a QE map in a matter of minutes, the photocathode scanner has proven to be an exceptional tool in quickly determining sensitivityand availability of the photocathode for operation.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 954830
- Report Number(s):
- JLAB-ACC-01-47; TRN: US1004609
- Resource Relation:
- Conference: Talk compiled for 22nd International Free Electron Laser Conference And 7th FEL Users Workshop, 13-18 Aug 2000, Durham, North Carolina
- Country of Publication:
- United States
- Language:
- English
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