Effects of cathode non-uniformity on emittance of an S-band photocathode RF gun
The need for a high brightness electron beam for the proposed Linac Coherent Light Source (LCLS) project at SLAC has led to the development of the Gun Test Facility (GTF) at SSRL. The design requirements for the LCLS are 1 nC of charge in a micro-bunch of 10 ps or less with a normalized rms emittance of 1pi mm mrad. Simulations of the GTF using a 1 nC bunch with 10 ps flat top temporal and uniform transverse distribution produce a simulated beam that meets the LCLS requirements. Initial measurements at the GTF with a micro-bunch containing 1 nC of charge with Gaussian longitudinal and transverse distributions, have shown that lengthening the laser pulse from 5 ps to 8 ps FWHM led to a reduction in the normalized emittance. In this paper, brief details of recent drive laser upgrades and results of emittance measurements--for which the photoemission from a Cu cathode is very non-uniform--are presented.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 753236
- Report Number(s):
- SLAC-PUB-8307; TRN: US0001861
- Resource Relation:
- Other Information: PBD: 14 Dec 1999
- Country of Publication:
- United States
- Language:
- English
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