CHARACTERIZATION OF THE SPARC PHOTO-INJECTOR WITH THE MOVABLE EMITTANCE METER∗

As a first stage of the commissioning of SPARC accel-erator a complete characterization of the photo-injector is planned. The objective is the optimization of the RF-gun setting that best matches the design working point and, generally, a detailed study of the emittance compensation process providing the optimal value of emittance at the end of the linac. For this purpose a novel beam diagnos-tic, the emittance-meter, consisting of a movable emittance measurement system, was conceived and built. This pa-per presents the results of the first measurements with the emittance-meter showing the characteristics and the perfor-mance at the SPARC photo-injector