First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients

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

doi:10.1088/1361-6668/ab82f0

Title: First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients

Journal Article · Mon Apr 20 00:00:00 EDT 2020 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/ab82f0· OSTI ID:1832068

;

; Geelhoed, M. I.; Prokofiev, O.; Thangaraj, J. C. T.

Abstract We demonstrate practical accelerating gradients on a superconducting radiofrequency (SRF) accelerator cavity with cryocooler conduction cooling, a cooling technique that does not involve the complexities of the conventional liquid helium bath. A design is first presented that enables conduction cooling an elliptical-cell SRF cavity. Implementing this design, a single cell 650 MHz Nb ₃ Sn cavity coupled using high purity aluminum thermal links to a 4 K pulse tube cryocooler generated accelerating gradients up to 6.6 MV m ⁻¹ at 100% duty cycle. The experiments were carried out with the cavity-cryocooler assembly in a simple vacuum vessel, completely free of circulating liquid cryogens. We anticipate that this cryocooling technique will make the SRF technology accessible to interested accelerator researchers who lack access to full-stack helium cryogenic systems. Furthermore, the technique can lead to SRF based compact sources of high average power electron beams for environmental protection and industrial applications. A concept of such an SRF compact accelerator is presented.

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

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1832068

Alternate ID(s):: OSTI ID: 1596040

Report Number(s):: arXiv:2001.07821; FERMILAB-PUB-20-011-DI-LDRD-TD

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Vol. 33 Journal Issue: 6; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Cited by: 10 works

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References (11)

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Thermal Link Design for Conduction Cooling of SRF Cavities Using Cryocoolers Dhuley, Ram C.; Kostin, Roman; Prokofiev, Oleg IEEE Transactions on Applied Superconductivity, Vol. 29, Issue 5 https://doi.org/10.1109/TASC.2019.2901252	journal	August 2019
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