Development of a cryocooler conduction-cooled 650 MHz SRF cavity operating at ~10 MV/m cw accelerating gradient

Dhuley, R. C.; Posen, S.; Geelhoed, M. I.; Thangaraj, J. C.T.

doi:10.1088/1757-899x/1240/1/012147

Development of a cryocooler conduction-cooled 650 MHz SRF cavity operating at ~10 MV/m cw accelerating gradient

Journal Article · Sun May 01 00:00:00 EDT 2022 · IOP Conference Series. Materials Science and Engineering

DOI:https://doi.org/10.1088/1757-899x/1240/1/012147· OSTI ID:1831966

Dhuley, R. C. ^[1]; Posen, S. ^[1]; Geelhoed, M. I. ^[1]; Thangaraj, J. C.T. ^[1]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

SRF cavities for particle acceleration are conventionally operated immersed in a bath of liquid helium at 4.2 K and below. Although this cooling configuration is practically and economically viable for large scientific accelerator installations, it may not be so for smaller accelerators intended for industrial applications such as the treatment of wastewater, sludge, flue gases, etc. In this paper, we describe a procedure to operate SRF cavities without liquid helium that can be used to construct electron-beam sources for industrial applications of electron irradiation (1-10 MeV electron energy). In this procedure, an elliptical single-cell 650 MHz niobium-tin coated niobium cavity is coupled to a closed-cycle 4.2 K cryocooler using high purity aluminum thermal links. The cryocooler conductively extracts heat (RF dissipation) from the cavity without requiring liquid helium around the cavity. We present construction details of this cryocooler conduction-cooling technique and systematic experiments that have demonstrated ~10 MV/m cw gradient on the cavity. By straightforward scaling up the cavity length and number of cryocoolers, the technique will provide the complete range of 1-10 MeV electron energy for industrial applications.

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1831966

Report Number(s):: FERMILAB-CONF-21-350-DI-TD; arXiv:2108.09397; oai:inspirehep.net:1909287

Journal Information:: IOP Conference Series. Materials Science and Engineering, Journal Name: IOP Conference Series. Materials Science and Engineering Journal Issue: 1 Vol. 1240; ISSN 1757-8981

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

References (9)

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