Title :
Results of the SLAC LCLS gun high-power RF tests
Author :
Dowell, D.H. ; Jongewaard, E. ; Limborg-Deprey, C. ; Schmerge, J. ; Li, Z. ; Xiao, L. ; Wang, J. ; Lewandowski, J. ; Vlieks, A.
Author_Institution :
SLAC, Menlo Park
Abstract :
The beam quality and operational requirements for the Linac coherent light source (LCLS) currently being constructed at SLAC are exceptional, requiring the design of a new RF photocathode gun for the electron source. Based on operational experience at SLAC´s GTF and SDL and ATF at BNL as well as other laboratories, the 1.6 cell s-band (2856 MHz) gun was chosen to be the best electron source for the LCLS, however a significant re-design was necessary to achieve the challenging parameters. Detailed 3-D analysis and design was used to produce near-perfect rotationally symmetric rf fields to achieve the emittance requirement. In addition, the thermo-mechanical design allows the gun to operate at 120 Hz and a 140 MV/m cathode field, or to an average power dissipation of 4 kW. Both average and pulsed heating issues are addressed in the LCLS gun design. The first LCLS gun is now fabricated and has been operated with high-power RF. The results of these high-power tests are presented and discussed.
Keywords :
accelerator RF systems; electron accelerators; electron beams; electron sources; linear accelerators; particle beam diagnostics; photocathodes; 3-D analysis; LCLS gun; SDL; SLAC GTF; beam quality; electron source; emittance requirement; frequency 120 Hz; high-power RF tests; linac coherent light source; photocathode; rotationally symmetric RF fields; thermo-mechanical design; Cathodes; Electron sources; Heating; Laboratories; Light sources; Linear particle accelerator; Power dissipation; Radio frequency; Testing; Thermomechanical processes;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4441061
