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arXiv · 2610.28870

Development of a Prototype Superconducting Radio-Frequency Multicell Cavity for Compact, Conduction-Cooled Accelerators

J. Vennekate·J. Armstrong·G. Ciovati·K. Harding·A. O'Brien·P. Owen·U. Pudasaini·D. Packard·D. Vollmer·T. Schultheiss
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Abstract

Jefferson Lab and General Atomics are jointly advancing compact, high-power irradiation systems capable of delivering electron-beam powers in the hundreds of kilowatts based on superconducting radio-frequency (SRF) technology. A critical step toward deploying SRF accelerators in industrial environments is replacing traditional liquid-helium cryogenic systems with conduction-cooled cryomodules powered by commercial cryocoolers. This paper reports recent progress in the design, fabrication, and testing of a prototype three-cell SRF cavity developed at Jefferson Lab and evaluated in a dedicated horizontal test cryostat at General Atomics. Peak surface magnetic fields up to 18.4\,mT, corresponding to accelerating gradients of approximately 4.3\,MV/m, were achieved in one of the cells. The results provide key insights into cavity preparation, thin-film coating, mechanical robustness, and cryogenic integration, offering guidance for the continued maturation of compact, conduction-cooled SRF accelerators for industrial irradiation applications.

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J. Vennekate, J. Armstrong, G. Ciovati, K. Harding, A. O'Brien, P. Owen, U. Pudasaini, D. Packard, D. Vollmer, T. Schultheiss. 2026-10-20. Development of a Prototype Superconducting Radio-Frequency Multicell Cavity for Compact, Conduction-Cooled Accelerators. https://doi.org/10.1109/tasc.2026.3732991

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