A HIGH GRADIENT 17 GHz RF GUN FOR THE PRODUCTION OF HIGH BRIGHTNESS ELECTRON BEAMS
نویسندگان
چکیده
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 πmm-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.
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