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

Abstract

Here, 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 3Sn 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.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1596040
Report Number(s):
arXiv:2001.07821; FERMILAB-PUB-20-011-DI-LDRD-TD
Journal ID: ISSN 0953-2048; oai:inspirehep.net:1777197
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 33; Journal Issue: 6; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Dhuley, R. C., Posen, S., Geelhoed, M. I., Prokofiev, O., and Thangaraj, J. C. T. First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients. United States: N. p., 2020. Web. doi:10.1088/1361-6668/ab82f0.
Dhuley, R. C., Posen, S., Geelhoed, M. I., Prokofiev, O., & Thangaraj, J. C. T. First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients. United States. doi:10.1088/1361-6668/ab82f0.
Dhuley, R. C., Posen, S., Geelhoed, M. I., Prokofiev, O., and Thangaraj, J. C. T. Mon . "First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients". United States. doi:10.1088/1361-6668/ab82f0.
@article{osti_1596040,
title = {First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients},
author = {Dhuley, R. C. and Posen, S. and Geelhoed, M. I. and Prokofiev, O. and Thangaraj, J. C. T.},
abstractNote = {Here, 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.},
doi = {10.1088/1361-6668/ab82f0},
journal = {Superconductor Science and Technology},
issn = {0953-2048},
number = 6,
volume = 33,
place = {United States},
year = {2020},
month = {4}
}

Journal Article:
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Works referenced in this record:

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