Diamond Amplified Photocathode at BNL
Diamond amplified photocathode
Brookhaven National Laboratory, New York
Result of NP research:
Electron cooling R&D for RHIC
Application currently being supported by:
DOD - ONR
Impact/benefit to spin-off field:
Highly efficient, hermetically sealed photocathode.
A new approach to generate high average, high-brightness electron beams from a laser photocathode RF gun is being developed at BNLfffd;s Collider-Accelerator Department. The principle of this device is based on the generation of a large number of secondary electrons in diamond. The primary electrons are generated by a conventional photocathode and accelerated towards the diamond by a voltage of a few thousand volts.
The secondary electrons, which can be more numerous than the primary electrons by one to two orders of magnitude, drift through the high-quality synthetic diamond and exit on the other side. The emission into vacuum is made possible by hydrogenation of the diamondfffd;s surface. The diamond amplified photocathode may improve the performance of laser-photocathode RF guns by providing a robust, high quantum-efficiency, low thermal-emittance cathode.
In the figure above Schematic diagram of a diamond amplified photocathode.
Last modified: 6/15/2011 1:43:01 PM