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Title: Theoretical estimates of maximum fields in superconducting resonant radio frequency cavities: stability theory, disorder, and laminates

Journal Article · · Superconductor Science and Technology
 [1]; ORCiD logo [2];  [3];  [4];  [1];  [1]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Brigham Young Univ., Provo, UT (United States)
  4. Forschungszentrum Julich, Julich (Germany)

Theoretical limits to the performance of superconductors in high magnetic fields parallel to their surfaces are of key relevance to current and future accelerating cavities, especially those made of new higher-Tc materials such as Nb$$_3$$Sn, NbN, and MgB$$_2$$. Indeed, beyond the so-called superheating field $$H_{\mathcal{sh}}$$, flux will spontaneously penetrate even a perfect superconducting surface and ruin the performance. We present intuitive arguments and simple estimates for $$H_{\mathcal{sh}}$$, and combine them with our previous rigorous calculations, which we summarize. We briefly discuss experimental measurements of the superheating field, comparing to our estimates. We explore the effects of materials anisotropy and the danger of disorder in nucleating vortex entry. Will we need to control surface orientation in the layered compound MgB$$_2$$? Can we estimate theoretically whether dirt and defects make these new materials fundamentally more challenging to optimize than niobium? Finally, we discuss and analyze recent proposals to use thin superconducting layers or laminates to enhance the performance of superconducting cavities. As a result, flux entering a laminate can lead to so-called pancake vortices; we consider the physics of the dislocation motion and potential re-annihilation or stabilization of these vortices after their entry.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359; SC0008431
OSTI ID:
1462248
Alternate ID(s):
OSTI ID: 1338075
Report Number(s):
arXiv:1608.00175; FERMILAB-PUB-16-699-TD; 1479192; TRN: US1902134
Journal Information:
Superconductor Science and Technology, Vol. 30, Issue 3; ISSN 0953-2048
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (7)

Time-dependent Ginzburg-Landau treatment of rf magnetic vortices in superconductors: Vortex semiloops in a spatially nonuniform magnetic field journal March 2020
The Effect of Inhomogeneous Surface Disorder on the Superheating Field of Superconducting RF Cavities text January 2018
Time-dependent Ginzburg-Landau treatment of RF Magnetic Vortices in Superconductors: Vortex-Semiloops in a Spatially Nonuniform Magnetic Field text January 2019
Dissipative conductivity of a dirty superconductor with Dynes subgap states under a dc bias current up to the depairing current density text January 2019
SRF Theory Developments from the Center for Bright Beams text January 2017
Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications text January 2019
$\textit{Ab Initio}$ Study of Antisite Defects in Nb$_3$Sn: Phase Diagram and Impact on Superconductivity text January 2019

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