LINAC2026 - 33rd Linear Accelerator Conference

Development and First Beam Generation of A Conduction Cooled SRF Photogun

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC1.A02 Electron and ion sources, guns, photo injectors, charge breeders Poster Session

Speaker

Chunguang Jing (Euclid Techlabs (United States))

Description

We report the first beam produced by the world’s first conduction-cooled superconducting radio-frequency (SRF) photogun. Euclid has developed a 1.5-cell, conduction cooled Nb3Sn SRF photogun operating at 1.3 GHz. The primary objective of this effort is to demonstrate ultra-stable electron beams for ultrafast electron microscopy and diffraction (UEM/UED) applications. 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. It 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.