The symmetrized 1.6 cell S-band photocathode gun developed by the BNL/SLAC/UCLA collaboration is in operation at the Brookhaven Accelerator Test Facility(ATF). A novel emittance compensation solenoid magnet has also been designed, built and is in operation at the ATE These two subsystems form an emittance compensated photoinjector used for beam dynamics, advanced acceleration and free electron laser experiments at the ATF. The highest acceleration field achieved on the copper cathode is 150 e, and the guns normal operating field is 130 s. The maximum rf pulse length is 3ps. The transverse emittance of the photoelectron beam were measured for various injection parameters. The 1 nC emittance results are presented along with electron bunch length measurements that indicated that at above the 400 pC, space charge bunch lengthening is occurring. The thermal emittance, eo, of the copper cathode has been measured.
Design and operation of a 50 MeV Electron LinearAccelerator utilizing a low emittance ( 7 c -5 to 10 mm-mrad) radio-frequency gun operating at an output energy of 5 MeV and a charge of 1 nC is described.Design calculations and early radio-frequency measurements and operational experience with the electron gun utilizing a dummy copper cathode in place of the proposed photocathode emitter are given.
The initial experimental results of the Brookhaven measurement or beam matching for the experimental tines.There
RF GUN CHARACTERIZATION AND ELECTRON EMISSION MEASUREMENTS
A description is givenlof the microprocessor systems in use at the NSLS, which utilize Intel Multibus* and NSLS-developed printed circuit boards. Ease of manufacturing and Elexibility of developing different systems from a set of NSLS standard components will be emphasized, and the low cost factors of each system and the utilization of off-the-shelf conponents will be indicated.
Operational experience of the emittance compensated photoinjector at the Brookhaven Accelerator Test Facility (ATF) is presented in this paper. The photoinjector has demonstrated the stability and reliability required for UV and X-ray FEL applications. The RF gun has been routinely running at more than 100 MV/m peak acceleration field; the laser system of the photoinjector has achieved 2% peak to peak energy stability, 0.5 % point stability and better than 2 ps timing jitter. The highest measured quantum efficiency of the Cu cathode is 0.05%. The electron beam bunch length was measured to be 10 ps using a linac RF phase scan. The normalized rms emittance for a 0.5 nC charge was measured, to be from 1 to 2 mm-mad, which agrees with PARMELA simulations.
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