Demonstration of CW Accelerating Gradients on a Cryogen-Free Cryocooler Conduction-Cooled SRF Cavity

Conference · Tue Jan 01 04:00:00 EST 2019

OSTI ID:1572517

Dhuley, R. C. ^[1]; Geelhoed, M. I. ^[1]; Zhao, Y. ^[2]; Terechkine, I. ^[1]; Alvarez, M. ^[1]; Prokofiev, O. ^[1]; Thangaraj, J. C.T. ^[1]

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1. Fermilab
2. 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 Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• 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

Related Subjects

43 PARTICLE ACCELERATORS