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B&A Seminars
Development of A Conduction Cooled SRF Photogun and Its First Beam Generation
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America/Chicago
Description
Abstract: We are excited to report on the first beam produced by the world’s first conduction cooled SRF photogun. Over the past five years, Euclid, working in collaboration with Fermilab and Argonne National Laboratory, has been developing a continuous-wave (CW), 1.5-cell, MeV-scale, conduction-cooled SRF photogun operating at 1.3 GHz. The primary objective of this effort is to demonstrate ultra-stable electron beams for UEM/UED applications, enabled by the exceptional shot-to-shot stability achievable with SRF technology compared to room-temperature RF photoguns. Although SRF systems were historically too costly for industrial deployment, two recent advancements: Nb₃Sn coatings and conduction cooling, have dramatically reduced system complexity and operating costs. This SRF photogun can deliver true CW operation while dissipating only ~2 W of RF power, eliminating the need for a high-power RF system and significantly reducing facility footprint. This SRF photogun is also featured with a raised Nb3Sn backwall serving as the photocathode, removing the need for an external cathode insert. In this talk, we present the development process of the cavity and cryostat, along with its cooldown performance, Q-slope behavior, synchronization characteristics, and the first beam generation.