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Description
For the SRF Gun-II at HZDR, the use of a molybdenum (Mo) photocathode plug is not feasible due to the large mismatch in thermal expansion coefficients between the Mo plug and it Cu holder. As a result, the standard plugs for Cs₂Te photocathodes are made of Cu in last years. However, Mo remains a more suitable substrate than Cu for high-quality Cs₂Te photocathodes. To overcome this limitation, we are developing a Mo-coated Cu substrate that maintains mechanical compatibility with the gun assembly while providing a pure Mo surface for Cs₂Te growth. This contribution presents the preparation and treatment procedures for the Cu plugs, the Mo coating process, and subsequent Cs₂Te deposition. Surface characterization of the coated plugs, along with initial photocathode performance measurements on the new Mo-coated Cu substrates, will be reported. The results will demontrate a promising path toward improved photocathode stability and efficiency for SRF Gun-II.
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