Quantum efficiency measurements of a copper photocathode in an RF electron gun
- 30 December 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 2976-2978
- https://doi.org/10.1109/pac.1993.309524
Abstract
A 4.5 MeV photocathode RF gun has been commissioned at UCLA. A photo-injector drive laser produces sub 2 ps pulses of UV (/spl lambda/=266 nm) light with up to 200 /spl mu/J/pulse, and illuminates a copper cathode. The photoelectrons are accelerated to an energy of 3.5 MeV within the gun. The electron beam charge is measured as a function of laser energy using an integrating current transformer (ICT). We present measurements of quantum efficiency as a function of laser polarization for injection angles of 2/spl deg/ and 70/spl deg/ with respect to the cathode normal. At 70/spl deg/ incidence a 50% enhancement in quantum efficiency (>10/sup -4/) is observed for p-polarized light over s-polarized light.<>Keywords
This publication has 5 references indexed in Scilit:
- Photoemission studies on metals using picosecond ultraviolet laser pulsesJournal of Applied Physics, 1991
- Design of the laser-driven RF electron gun for the BNL accelerator test facilityIEEE Transactions on Electron Devices, 1988
- Simple laser-driven, metal-photocathode electron sourceApplied Physics Letters, 1986
- Generation of relativistic photoelectrons induced by excimer laser irradiationApplied Physics Letters, 1984
- Vectorial Photoelectric Effect in Clean Molybdenum*Journal of the Optical Society of America, 1964