Title :
Injector design for the 4GLS high average current loop
Author :
McKenzie, W. ; Militsyn, B.L. ; Terekhov, A.S.
Author_Institution :
STFC Daresbury Lab., Warrington
Abstract :
The proposed 4th Generation Light Source (4GLS) consists of three electron branches. We present the design of the injector for the High Average Current Loop which feeds spontaneous light sources and a Vacuum Ultraviolet FEL. The injector aims to provide 77 pC bunches at a repetition rate of up to 1.3 GHz which corresponds to an average current of 100 mA. It consists of a 500 kV GaAs based DC photocathode electron gun equipped with a photocathode preparation facility, followed by a normal- conducting buncher cavity and a 10 MeV superconducting RF booster. Simulations are presented which show the injector provides a beam with a normalised rms transverse emittance of less than 3 pi-mm-mrad and a bunch length of about 2 ps.
Keywords :
accelerator RF systems; accelerator cavities; electron guns; free electron lasers; light sources; particle beam bunching; particle beam injection; photocathodes; superconducting devices; 4th Generation Light Source; GaAs DC photocathode; High Average Current Loop; beam dynamics; electron gun; free-electron lasers; injector design; normal-conducting buncher cavity; superconducting RF booster; transverse emittance; vacuum ultra-violet region; Cathodes; Electron beams; Gallium arsenide; Laboratories; Light sources; Radio frequency; Solenoids; Superconducting photodetectors; Superconducting transmission lines; X-ray lasers;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440995
