GROWTH AND CHARACTERIZATION OF BIALKALI PHOTOCATHODES FOR CORNELL ERL INJECTOR

The requirements for high quantum efficiency in the visible spectral range and an increased lifetime as compared to cesiated GaAs can be met by multi-alkali photocathodes, either CsKSb or NaKSb. In this paper we detail the procedures that allow the growth of these thin films suitable for the ERL photoinjector operating at Cornell University. Quantum efficiency, spectral response, and surface characterization of deposited samples are presented. A load-locked multi-alkali cathode growth system is also described.