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Description
Multi-alkali antimonide photocathodes have emerged as promising photoemissive materials for electron sources in high-repetition-rate free-electron laser (FEL) applications due to their low thermal emittance and high quantum efficiency in the green wavelength region. To evaluate their feasibility for operation in high-gradient RF guns, a collaborative effort between DESY-PITZ and INFN-LASA was initiated to develop and characterize multi-alkali photocathode materials under operative condition. As part of this effort, a NaKSb(Cs) photocathode belonging to the multi-alkali antimonide family was grown on a molybdenum substrate using a sequential deposition method in the new preparation system at INFN-LASA. A thermal degradation study of this photocathode was conducted, and its behavior was compared with a KCsSb film. This contribution presents the experimental results of the NaKSb(Cs) photocathode, focusing on its thermal degradation behavior and comparative analysis with the KCsSb photocathode.
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