For the Linac Coherent Light Source II (LCLS-II) project at SLAC, a 1.3 GHz superconducting rf (SRF) linac is being constructed that will generate 4 GeV electron bunches high repetition rate to drive x-ray free lasers. The LCLS-II source, which comprises first three meters of injector, includes two normal-conducting, continuous-wave cavities: one-cell, 185.7 MHz gun and two-cell, buncher. It al...

The production of high spectral brilliance radiation from electron beam sources depends critically on the qualities. One must obtain very brightness, implying simultaneous peak current and low emittance. These attributes are enabled through use field acceleration in a radio-frequency (rf) photoinjector source. Despite fields currently utilized, there is limit achievable brightness operation, ra...