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Title: Development of a cryocooler conduction-cooled 650 MHz SRF cavity operating at ~10 MV/m cw accelerating gradient

Journal Article · · IOP Conference Series. Materials Science and Engineering
 [1];  [1];  [1];  [1]
  1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
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SRF cavities for particle acceleration are conventionally operated immersed in a bath of liquid helium at 4.2 K and below. Although this cooling configuration is practically and economically viable for large scientific accelerator installations, it may not be so for smaller accelerators intended for industrial applications such as the treatment of wastewater, sludge, flue gases, etc. In this paper, we describe a procedure to operate SRF cavities without liquid helium that can be used to construct electron-beam sources for industrial applications of electron irradiation (1-10 MeV electron energy). In this procedure, an elliptical single-cell 650 MHz niobium-tin coated niobium cavity is coupled to a closed-cycle 4.2 K cryocooler using high purity aluminum thermal links. The cryocooler conductively extracts heat (RF dissipation) from the cavity without requiring liquid helium around the cavity. We present construction details of this cryocooler conduction-cooling technique and systematic experiments that have demonstrated ~10 MV/m cw gradient on the cavity. By straightforward scaling up the cavity length and number of cryocoolers, the technique will provide the complete range of 1-10 MeV electron energy for industrial applications.

Research Organization:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1831966
Report Number(s):
FERMILAB-CONF-21-350-DI-TD; arXiv:2108.09397; oai:inspirehep.net:1909287; TRN: US2216692
Journal Information:
IOP Conference Series. Materials Science and Engineering, Vol. 1240, Issue 1; ISSN 1757-8981
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (9)

Thermal Link Design for Conduction Cooling of SRF Cavities Using Cryocoolers journal August 2019
Demonstration of CW accelerating gradients on a cryogen-free, cryocooler conduction-cooled SRF cavity journal March 2020
A field-enhanced conduction-cooled superconducting cavity for high-repetition-rate ultrafast electron bunch generation
  • Mohsen, O.; Mihalcea, D.; Tom, N.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1005 https://doi.org/10.1016/j.nima.2021.165414
journal July 2021
Parametrization of the niobium thermal conductivity in the superconducting state journal June 1996
Nb 3 Sn superconducting radiofrequency cavities: fabrication, results, properties, and prospects journal January 2017
Thermal resistance of pressed contacts of aluminum and niobium at liquid helium temperatures journal July 2018
Thermal conductance characterization of a pressed copper rope strap between 0.13 K and 10 K journal September 2017
First demonstration of a cryocooler conduction cooled superconducting radiofrequency cavity operating at practical cw accelerating gradients journal April 2020
Electron Accelerators for Environmental Protection journal January 2011

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