none12An RF gun with a laser-triggered photocathode is a very
attractive as an injector for linear accelerators since it can
produce a low-emittance high-current electron beam with
originally short pulse length. A GaAs photocathode can
generate a polarized electron beam. The time response of
GaAs photocathode is very important for RF gun operation
if it is comparable with RF period. An experirnental
facility has been fabricated to measure the length of
electron bunch extracted from GaAs photocathode illuminated
by laser pulse of 98 ps (FWHM). The method of
hunch length measurement using circular scanning in RF
cavity was developed. We use 50 kV DC gun for beam
extraction. The minimum measured bunch duration was
106 +/- 20 ps (FWHM) for 4.5. 10^8 electrons per pulse. In
this report we describe the experimental setup and obtained
results.noneP. V. Logatchev; A. V. Aleksandrov; M. S. Avilov; N. S. Dikansky; A. V. Novokhatski; G. Ciullo; G. Lamanna; B. Yang; R. Calabrese; V. Guidi; P. Lenisa; L. TecchioP. V., Logatchev; A. V., Aleksandrov; M. S., Avilov; N. S., Dikansky; A. V., Novokhatski; Ciullo, Giuseppe; G., Lamanna; B., Yang; Calabrese, Roberto; Guidi, Vincenzo; Lenisa, Paolo; L., Tecchi
