Title :
Emittance studies of the BNL/SLAC/UCLA 1.6 cell photocathode RF gun
Author :
Palmer, D.T. ; Wang, X.J. ; Miller, R.H. ; Babzien, M. ; Ben-Zvi, I. ; Pellegrini, C. ; Sheehan, J. ; Skaritka, J. ; Winick, H. ; Woodle, M. ; Yakimenko, V.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
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 ATF. 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 MV/m, and the guns normal operating field is 130 MV/m. The maximum rf pulse length is 3 μs. 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, ε 0, of the copper cathode has been measured
Keywords :
accelerator RF systems; electron guns; electron sources; particle beam diagnostics; particle beam dynamics; photocathodes; 1.6 cell; BNL/SLAC/UCLA; S-band; beam dynamics; electron bunch length; emittance; emittance compensation solenoid magnet; free electron laser; photocathode RF gun; rf pulse length; space charge bunch lengthening; thermal emittance; transverse emittance; Acceleration; Cathodes; Collaboration; Copper; Electron emission; Laser beams; Life estimation; Radio frequency; Solenoids; Test facilities;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.752732
