Efficient expulsion of magnetic flux in superconducting radiofrequency cavities for high Q 0 applications

Posen, S.; Checchin, M.; Crawford, A. C.; Grassellino, A.; Martinello, M.; Melnychuk, O. S.; Romanenko, A.; Sergatskov, D. A.; Trenikhina, Y.

doi:10.1063/1.4953087

Title: Efficient expulsion of magnetic flux in superconducting radiofrequency cavities for high Q ₀ applications

Journal Article · Tue Jun 07 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4953087· OSTI ID:1255462

Posen, S.; Checchin, M.;

; Grassellino, A.; Martinello, M.; Melnychuk, O. S.; Romanenko, A.;

; Trenikhina, Y.

Even when cooled through its transition temperature in the presence of an external magnetic field, a superconductor can expel nearly all external magnetic flux. This Letter presents an experimental study to identify the parameters that most strongly influence flux trapping in high purity niobium during cooldown. This is critical to the operation of superconducting radiofrequency cavities, in which trapped flux degrades the quality factor and therefore cryogenic efficiency. Flux expulsion was measured on a large survey of 1.3 GHz cavities prepared in various ways. It is shown that both spatial thermal gradient and high temperature treatment are critical to expelling external magnetic fields, while surface treatment has minimal effect. For the first time, it is shown that a cavity can be converted from poor expulsion behavior to strong expulsion behavior after furnace treatment, resulting in a substantial improvement in quality factor. In conclusion, future plans are described to build on this result in order to optimize treatment for future cavities.

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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:: Contract No. DE-AC02-07CH11359; AC02-07CH11359

OSTI ID:: 1255462

Alternate ID(s):: OSTI ID: 1325210; OSTI ID: 1421084

Report Number(s):: arXiv:1509.03957; FERMILAB-PUB-16-366-TD

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Vol. 119 Journal Issue: 21; ISSN 0021-8979

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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Cited By (5)

Two different origins of the $Q$ -slope problem in superconducting niobium film cavities for a heavy ion accelerator at CERN Miyazaki, A.; Delsolaro, W. Venturini Physical Review Accelerators and Beams, Vol. 22, Issue 7 https://doi.org/10.1103/physrevaccelbeams.22.073101	journal	July 2019
Effect of interstitial impurities on the field dependent microwave surface resistance of niobium Martinello, M.; Grassellino, A.; Checchin, M. Applied Physics Letters, Vol. 109, Issue 6 https://doi.org/10.1063/1.4960801	journal	August 2016
The importance of the electron mean free path for superconducting radio-frequency cavities Maniscalco, J. T.; Gonnella, D.; Liepe, M. Journal of Applied Physics, Vol. 121, Issue 4 https://doi.org/10.1063/1.4974909	journal	January 2017
Magnetometric mapping of superconducting RF cavities Schmitz, B.; Köszegi, J.; Alomari, K. Review of Scientific Instruments, Vol. 89, Issue 5 https://doi.org/10.1063/1.5030509	journal	May 2018
Theory of RF superconductivity for resonant cavities Gurevich, Alex Superconductor Science and Technology, Vol. 30, Issue 3 https://doi.org/10.1088/1361-6668/30/3/034004	journal	January 2017

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