PHOTOCATHODES FOR FREE-ELECTRON LASERS

Authors
KONG SH KINROSSWRIGHT J NGUYEN DC SHEFFIELD RL
Citation
Sh. Kong et al., PHOTOCATHODES FOR FREE-ELECTRON LASERS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 358(1-3), 1995, pp. 272-275
Citations number
19
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
358
Issue
1-3
Year of publication
1995
Pages
272 - 275
Database
ISI
SICI code
0168-9002(1995)358:1-3<272:PFFL>2.0.ZU;2-3
Abstract
Many different photocathodes have been used as electron sources for FE Ls and other electron accelerator systems. In choosing one, a compromi se between lifetime and quantum efficiency has been unavoidable. High quantum efficiency photocathodes such as K2CsSb, Cs3Sb, and cesiated G aAs have short operational lifetimes and require an ultrahigh-vacuum e nvironment. Long lifetime photocathodes such as LaB6, Cu, and Y have r elatively low quantum efficiencies. However, recently, cesium tellurid e was found to be an exception. Initial results from CERN and now at L os Alamos have shown that Cs2Te is reasonably rugged with a high quant um efficiency below 270 nm. Further studies carried out at Los Alamos have determined that its performance as an electron source for the Los Alamos Advanced FEL is excellent.