Shielding Superconductors with Thin Films as Applied to rf Cavities for Particle Accelerators
Abstract
Determining the optimal arrangement of superconducting layers to withstand large-amplitude ac magnetic fields is important for certain applications such as superconducting radio-frequency cavities. In this paper, we evaluate the shielding potential of the superconducting-film–insulating-film–superconductor (SIS') structure, a configuration that could provide benefits in screening large ac magnetic fields. After establishing that, for high-frequency magnetic fields, flux penetration must be avoided, the superheating field of the structure is calculated in the London limit both numerically and, for thin films, analytically. For intermediate film thicknesses and realistic material parameters, we also solve numerically the Ginzburg-Landau equations. As a result, it is shown that a small enhancement of the superheating field is possible, on the order of a few percent, for the SIS' structure relative to a bulk superconductor of the film material, if the materials and thicknesses are chosen appropriately.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1224722
- Alternate Identifier(s):
- OSTI ID: 1234892
- Report Number(s):
- FERMILAB-PUB-15-547-TD
Journal ID: ISSN 2331-7019; PRAHB2; 044019
- Grant/Contract Number:
- SC0002329; SC0008431; AC02-07CH11359
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Applied
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2331-7019
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Posen, Sam, Transtrum, Mark K., Catelani, Gianluigi, Liepe, Matthias U., and Sethna, James P. Shielding Superconductors with Thin Films as Applied to rf Cavities for Particle Accelerators. United States: N. p., 2015.
Web. doi:10.1103/PhysRevApplied.4.044019.
Posen, Sam, Transtrum, Mark K., Catelani, Gianluigi, Liepe, Matthias U., & Sethna, James P. Shielding Superconductors with Thin Films as Applied to rf Cavities for Particle Accelerators. United States. https://doi.org/10.1103/PhysRevApplied.4.044019
Posen, Sam, Transtrum, Mark K., Catelani, Gianluigi, Liepe, Matthias U., and Sethna, James P. Thu .
"Shielding Superconductors with Thin Films as Applied to rf Cavities for Particle Accelerators". United States. https://doi.org/10.1103/PhysRevApplied.4.044019.
@article{osti_1224722,
title = {Shielding Superconductors with Thin Films as Applied to rf Cavities for Particle Accelerators},
author = {Posen, Sam and Transtrum, Mark K. and Catelani, Gianluigi and Liepe, Matthias U. and Sethna, James P.},
abstractNote = {Determining the optimal arrangement of superconducting layers to withstand large-amplitude ac magnetic fields is important for certain applications such as superconducting radio-frequency cavities. In this paper, we evaluate the shielding potential of the superconducting-film–insulating-film–superconductor (SIS') structure, a configuration that could provide benefits in screening large ac magnetic fields. After establishing that, for high-frequency magnetic fields, flux penetration must be avoided, the superheating field of the structure is calculated in the London limit both numerically and, for thin films, analytically. For intermediate film thicknesses and realistic material parameters, we also solve numerically the Ginzburg-Landau equations. As a result, it is shown that a small enhancement of the superheating field is possible, on the order of a few percent, for the SIS' structure relative to a bulk superconductor of the film material, if the materials and thicknesses are chosen appropriately.},
doi = {10.1103/PhysRevApplied.4.044019},
journal = {Physical Review Applied},
number = 4,
volume = 4,
place = {United States},
year = {Thu Oct 29 00:00:00 EDT 2015},
month = {Thu Oct 29 00:00:00 EDT 2015}
}
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https://doi.org/10.1103/PhysRevApplied.4.044019
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