Demonstration of CW accelerating gradients on a cryogen-free, cryocooler conduction-cooled SRF cavity

Conduction-cooling of superconducting radiofrequency (SRF) cavities using closed-cycle 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) accel...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 755; no. 1; pp. 12136 - 12143
Main Authors Dhuley, R C, Geelhoed, M I, Zhao, Y, Terechkine, I, Alvarez, M, Prokofiev, O, Thangaraj, J C T
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.03.2020
Subjects
Accelerators
Aluminum
Conduction cooling
Continuous radiation
Helium
Holes
Linear accelerators
Liquid helium
Niobium
Radio frequency
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Summary:Conduction-cooling of superconducting radiofrequency (SRF) cavities using closed-cycle 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 aluminum 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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/755/1/012136