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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1526098
Alternate Identifier(s):
OSTI ID: 1526478
Report Number(s):
JLAB-ACC-19-2917; DOE/OR/23177-4709
Journal ID: ISSN 2331-7019; PRAHB2; 064030
Grant/Contract Number:  
SC0017931; SC0009962; AC05-06OR23177
Resource Type:
Published Article
Journal Name:
Physical Review Applied
Additional Journal Information:
Journal Name: Physical Review Applied Journal Volume: 11 Journal Issue: 6; Journal ID: ISSN 2331-7019
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Oripov, Bakhrom, Bieler, Thomas, Ciovati, Gianluigi, Calatroni, Sergio, Dhakal, Pashupati, Junginger, Tobias, Malyshev, Oleg B., Terenziani, Giovanni, Valente-Feliciano, Anne-Marie, Valizadeh, Reza, Wilde, Stuart, and Anlage, Steven M. High-Frequency Nonlinear Response of Superconducting Cavity-Grade Nb  Surfaces. United States: N. p., 2019. Web. doi:10.1103/PhysRevApplied.11.064030.
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Oripov, Bakhrom, Bieler, Thomas, Ciovati, Gianluigi, Calatroni, Sergio, Dhakal, Pashupati, Junginger, Tobias, Malyshev, Oleg B., Terenziani, Giovanni, Valente-Feliciano, Anne-Marie, Valizadeh, Reza, Wilde, Stuart, & Anlage, Steven M. High-Frequency Nonlinear Response of Superconducting Cavity-Grade Nb  Surfaces. United States. https://doi.org/10.1103/PhysRevApplied.11.064030
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Oripov, Bakhrom, Bieler, Thomas, Ciovati, Gianluigi, Calatroni, Sergio, Dhakal, Pashupati, Junginger, Tobias, Malyshev, Oleg B., Terenziani, Giovanni, Valente-Feliciano, Anne-Marie, Valizadeh, Reza, Wilde, Stuart, and Anlage, Steven M. Thu . "High-Frequency Nonlinear Response of Superconducting Cavity-Grade Nb  Surfaces". United States. https://doi.org/10.1103/PhysRevApplied.11.064030.
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@article{osti_1526098,
title = {High-Frequency Nonlinear Response of Superconducting Cavity-Grade Nb  Surfaces},
author = {Oripov, Bakhrom and Bieler, Thomas and Ciovati, Gianluigi and Calatroni, Sergio and Dhakal, Pashupati and Junginger, Tobias and Malyshev, Oleg B. and Terenziani, Giovanni and Valente-Feliciano, Anne-Marie and Valizadeh, Reza and Wilde, Stuart and Anlage, Steven M.},
abstractNote = {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.},
doi = {10.1103/PhysRevApplied.11.064030},
journal = {Physical Review Applied},
number = 6,
volume = 11,
place = {United States},
year = {Thu Jun 13 00:00:00 EDT 2019},
month = {Thu Jun 13 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevApplied.11.064030
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Cited by: 7 works
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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of experimental setup. A microwave (MW) source is used to generate rf signal and feed it to the magnetic probe. The sample response magnetic field is coupled back to the probe and measured with a spectrum analyzer. (b) Sketch of the probe-sample interaction. The magnetic probemore » is approximated as a current loop producing perpendicular magnetic field inducing screening currents on the surface of the sample. This current generates a response magnetic field that is coupled back to the same probe.« less
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