Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity
- Fermilab
- Euclid Techlabs, Bolingbrook
Conduction-cooling of superconducting radiofrequency (SRF) cavities using closedcycle cryocoolers can lead to compact linear accelerators by eliminating liquid helium and the associated infrastructure. In this paper, we present the first-ever experimental demonstration of continuous wave (cw) accelerating gradients on a niobium SRF cavity that is cooled without using liquid helium. In a newly developed experimental apparatus, a single-cell, 650 MHz niobium cavity was conductively coupled to a 2 W @ 4.2 K pulse tube cryocooler using a high-purity aluminium thermal link. The cw accelerating gradient slightly exceeded 1.5 MV/m, a limit imposed by our RF power supply. Using simple scaling, we project that the niobium cavity when coated with Nb3Sn and operated on the same experimental setup can produce >10 MV/m cw accelerating gradients.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1572517
- Report Number(s):
- FERMILAB-CONF-19-351-DI-LDRD-TD; oai:inspirehep.net:1761310
- Country of Publication:
- United States
- Language:
- English
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