skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: DIAMOND AMPLIFIER FOR PHOTOCATHODES.

Conference ·

We report a new approach to the generation of high-current, high-brightness electron beams. Primary electrons are produced by a photocathode (or other means) and are accelerated to a few thousand electron-volts, then strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The secondary electrons drift through the diamond under an electric field and emerge into the accelerating proper of the ''gun'' through a Negative Electron Affinity surface of the diamond. The advantages of the new approach include the following: (1) Reduction of the number of primary electrons by the large SEY, i.e. a very low laser power in a photocathode producing the primaries. (2) Low thermal emittance due to the NEA surface and the rapid thermalization of the electrons. (3) Protection of the cathode from possible contamination from the gun, allowing the use of large quantum efficiency but sensitive cathodes. (4) Protection of the gun from possible contamination by the cathode, allowing the use of superconducting gun cavities. (5) Production of high average currents, up to ampere class. (6) Encapsulated design, making the ''load-lock'' systems unnecessary. This paper presents the criteria that need to be taken into account in designing the amplifier.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
DOE/OFFICE OF SCIENCE (US)
DOE Contract Number:
AC02-98CH10886
OSTI ID:
15009620
Report Number(s):
BNL-73169-2004-CP; R&D Project: KA-04-04; PO-24; TRN: US200429%%1594
Resource Relation:
Conference: 11TH AAC WORKSHOP, STONY BROOK, NY (US), 06/21/2004--06/26/2004; Other Information: PBD: 21 Jun 2004
Country of Publication:
United States
Language:
English

Similar Records

Diamond Amplifier For Photocathodes
Journal Article · Tue Dec 07 00:00:00 EST 2004 · AIP Conference Proceedings · OSTI ID:15009620

Measurements and Studies of Secondary Electron Emission of Diamond Amplified Photocathode
Technical Report · Wed Oct 01 00:00:00 EDT 2008 · OSTI ID:15009620

DIAMOND AMPLIFIED PHOTOCATHODES.
Conference · Mon Nov 26 00:00:00 EST 2007 · OSTI ID:15009620