Measurement of the UCLA/URLS/INFN hybrid gun

The hybrid photoinjector is a high current, low emittance photoinjector/accelerator that is under design with collaboration from Roma University La Sapienza, INFN - Laboratori Nazionali di Frascati and the UCLA Particle Beam Physics Lab. The hybrid standing wave-traveling wave photoinjector uses a coupling cell to divide power between a high gradient 1.6 cell standing wave photoinjector, for electron emission and collection, and a lower gradient traveling wave accelerator, for acceleration to desired energies at low emittances. Simulation results show promising beam properties of less than 4 mm-mrad emittance, energy spreads of 1.5 percent, and currents as high as 1.2 kA at energies of 21 MeV. We report on the progress of RF design and results of cold test RF measurements at the UCLA Pegasus Laboratory, including methods for measurements and difficulties arising in the transition from simulation to physical measurements.