Title :
A high gradient 17 GHz RF gun for the production of high brightness electron beams
Author :
Brown, W.J. ; Kreischer, K.E. ; Pedrozzi, M. ; Shapiro, M.A. ; Temkim, R.J. ; Wan, X.
Author_Institution :
Plasma Sci. & Fusion Center, MIT, Cambridge, MA, USA
Abstract :
We report on the design and construction of a new, tuneable, 1.5 cell 17 GHz RF gun and improved beamline. Emittance compensation in the new beamline is achieved with a 6.5 cm long, 0.5 T solenoid placed immediately after the RF gun. Simulations predict a normalized RMS emittance of 0.5 nmm-mrad for a 1 ps, 0.1 nC, 2.4 MeV beam. Emittance measurement diagnostic slits have also been designed and constructed. This gun will operated with 50 ns, approximately 5 MW, pulses from a 17.13 GHz klystron amplifier built by Haimson Research Corp. Initial cold tests of the new gun have been performed. The on axis field profile of the RF gun has recently been measured using a “bead hang” technique developed at MIT to forgo the need of a hole in the cathode as required by the more conventional “bead pull” measurement. A balanced field profile was obtained
Keywords :
accelerator RF systems; electron accelerators; electron guns; electron sources; klystrons; particle beam diagnostics; 0.5 T; 17 GHz; 2.4 MeV; 5 MW; 6.5 cm; balanced field profile; cold tests; diagnostic slits; emittance compensation; high brightness electron beams production; high gradient RF gun; improved beamline; klystron amplifier; normalized RMS emittance; on axis field profile; solenoid; Brightness; Klystrons; Predictive models; Production; Pulse amplifiers; Radio frequency; Radiofrequency amplifiers; Solenoids; Structural beams; Testing;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795630
