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Near-field microwave magnetic nanoscopy of superconducting radio frequency cavity materials
Tai, T Ghamsari, BG Bieler, TR Tan, T Xi, XX Anlage, SM
Tai, T
Ghamsari, BG
Bieler, TR
Tan, T
Xi, XX
Anlage, SM
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Journal Article
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2014-06-09
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10.1063/1.4881880
Abstract
A localized measurement of the RF critical field on superconducting radio frequency (SRF) cavity materials is a key step to identify specific defects that produce quenches of SRF cavities. Two measurements are performed to demonstrate these capabilities with a near-field scanning probe microwave microscope. The first is a third harmonic nonlinear measurement on a high Residual-Resistance- Ratio bulk Nb sample showing strong localized nonlinear response, with surface RF magnetic field Bsurface∼ 102 mT. The second is a raster scanned harmonic response image on a MgB2 thin film demonstrating a uniform nonlinear response over large areas. © 2014 AIP Publishing LLC.
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Applied Physics Letters
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