Thumbnail
Access Restriction
Open

Author Herrera-Gomez, A. ♦ Vergara, G. ♦ Spicer, W. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ PARTICLE ACCELERATORS ♦ GALLIUM ARSENIDES ♦ PHOTOCATHODES ♦ STANFORD LINEAR ACCELERATOR CENTER ♦ ELECTRON SOURCES ♦ LINEAR ACCELERATORS ♦ SPACE CHARGE ♦ LASER RADIATION ♦ PULSES ♦ AFFINITY ♦ PHOTOEMISSION ♦ SPACE CHARGES ♦ NS RANGE
Abstract GaAs negative electron affinity cathodes are used as high-intensity, short-time electron source at the Stanford Linear Accelerator Center. When the cathodes are illuminated with high-intensity laser pulses draw peak currents that are extremely high, typically of tens of Amperes. Because of the high currents, some nonlinear effects are present. Very noticeable is the so-called charge limit (CL) effect, which consists of a limit on the total charge in each pulse; that is, the total bunch charge stops increasing as the light pulse intensity increases. The CL effect is directly related to a photovoltage built up in the surface as a consequence of the photoelectrons coming from the bulk. We discuss possible ways to minimize the formation of the surface photovoltage. {copyright} {ital 1996 American Institute of Physics.}
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Department Stanford Linear Accelerator Center
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 79
Issue Number 9
Organization Stanford Linear Accelerator Center


Open content in new tab

   Open content in new tab