To meet future demands of free electron lasers, reliable and long lasting photocathodes are needed. With current photocathodes lacking a sufficient combination of both lifetime and high quantum efficiency, research continues to explore ways to formulate improved photocathodes. In this work, we investigate the photoemissive and thermal stability properties of CsAu on a porous tungsten substrate. Quantum efficiency (QE) and robustness characterization of evaporatively deposited metal cathodes, such as gold, opens possibilities for future long-lived high QE dispenser photocathodes on both conductive and insulating diffusion barriers.

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