Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 33, Issue 6, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/ab82f0
Keywords
cryogen free; particle accelerator; environmental protection; electron beam; compact accelerator
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-AC02-07CH11359]
- Fermilab Laboratory Directed Research and Development (LDRD)
- Fermilab LDRD
- S. Posen DOE Early Career Award
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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 Nb3Sn 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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