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Title: High-Frequency Nonlinear Response of Superconducting Cavity-Grade Nb  Surfaces

Journal Article · · Physical Review Applied
 [1];  [2];  [3];  [4];  [3];  [5];  [6];  [4];  [3];  [6];  [6];  [1]
  1. Univ. of Maryland, College Park, MD (United States)
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  5. Lancaster Univ., Lancaster (United Kingdom)
  6. STFC Daresbury Lab, Warrington (United Kingdom)

Nb Superconducting Radio-Frequency (SRF) cavities are observed to break down and lose their high-$$Q$$ superconducting properties at accelerating gradients below the limits imposed by theory. The microscopic origins of SRF cavity breakdown are still a matter of some debate. To investigate these microscopic issues temperature and power dependent local third harmonic response was measured on bulk Nb and Nb thin film samples using a novel near-field magnetic microwave microscope between 2.9K-10K and 2GHz-6GHz. Both periodic and non-periodic response as a function of applied RF field amplitude are observed. We attribute these features to extrinsic and intrinsic nonlinear responses of the sample. The RF-current-biased Resistively Shunted Junction (RSJ) model can account for the periodic response and fits very well to the data using reasonable parameters. The non-periodic response is consistent with vortex semi-loops penetrating into the bulk of the sample once sufficiently high RF magnetic field is applied, and the data can be fit to a Time-Dependent Ginzburg-Landau (TDGL) model of this process. The fact that these responses are measured on a wide variety of Nb samples suggests that we have captured the generic nonlinear response of air-exposed Nb surfaces.

Research Organization:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE
Grant/Contract Number:
SC0017931; SC0009962; AC05-06OR23177
OSTI ID:
1526098
Alternate ID(s):
OSTI ID: 1526478
Report Number(s):
JLAB-ACC-19-2917; DOE/OR/23177-4709; PRAHB2
Journal Information:
Physical Review Applied, Vol. 11, Issue 6; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 7 works
Citation information provided by
Web of Science

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Cited By (3)


Figures / Tables (9)