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Title: Multi-metallic conduction cooled superconducting radio-frequency cavity with high thermal stability

Journal Article · · Superconductor Science and Technology
ORCiD logo [1];  [2];  [3];  [2]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Old Dominion Univ., Norfolk, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
+ Show Author Affiliations

Superconducting radio-frequency cavities are commonly used in modern particle accelerators for applied and fundamental research. Such cavities are typically made of high-purity, bulk Nb and with cooling by a liquid helium bath at a temperature of ~2 K. The size, cost and complexity of operating a particle accelerator with a liquid helium refrigerator make the current cavity technology not favorable for use in industrial-type accelerators. We have developed a multi-metallic 1.495 GHz elliptical cavity conductively cooled by a cryocooler. The cavity has a ~2 µm thick layer of Nb3Sn on the inner surface, exposed to the rf field, deposited on a ~3 mm thick bulk Nb shell and a bulk Cu shell, of thickness $$\geqslant\! 5$$ mm deposited on the outer surface by electroplating. A bolt-on Cu plate 1.27 cm thick was used to thermally connect the cavity equator to the second stage of a Gifford-McMahon cryocooler with a nominal capacity of 2 W at 4.2 K. The cavity was tested initially in liquid helium at 4.3 K and reached a peak surface magnetic field of ~36 mT with a quality factor of 2 × 109. The cavity cooled by the cryocooler achieved a peak surface magnetic field of ~29 mT, equivalent to an accelerating gradient of 6.5 MV m–1. The conduction-cooled cavity could be operated in continuous-wave with as high as 5 W dissipation in the cavity for 1 h without any thermal breakdown, because of the Cu outer layer with high thermal conductivity. This result represents a paradigm shift in the technology of superconducting accelerator cavities.

Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-06OR23177
OSTI ID:
1642701
Report Number(s):
DOE-OR--23177-5009; JLAB-ACC--20-3141; arXiv:2001.10924
Journal Information:
Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 7 Vol. 33; ISSN 0953-2048; ISSN 1361-6668
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (7)

RF Superconductivity book March 2009
Review of ingot niobium as a material for superconducting radiofrequency accelerating cavities
  • Kneisel, P.; Ciovati, G.; Dhakal, P.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 774 https://doi.org/10.1016/j.nima.2014.11.083
journal February 2015
Low temperature tensile and fracture characteristics of high purity niobium
  • Walsh, R. P.
  • ADVANCES IN CRYOGENIC ENGINEERING: Proceedings of the International Cryogenic Materials Conference - ICMC, AIP Conference Proceedings https://doi.org/10.1063/1.1472542
conference January 2002
Nb 3 Sn superconducting radiofrequency cavities: fabrication, results, properties, and prospects journal January 2017
Fundamental origin of the large impact of strain on superconducting Nb 3 Sn journal September 2018
Thermal interface material characterization for cryogenic electronic packaging solutions journal December 2017
Design of a cw, low-energy, high-power superconducting linac for environmental applications journal September 2018

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