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    Nonlinear near-field microwave microscope for RF defect localization in superconductors

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    1008.2948v1.pdf
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    Genre
    Journal Article
    Date
    2011-06-01
    Author
    Tai, T
    Xi, XX
    Zhuang, CG
    Mircea, DI
    Anlage, SM
    Subject
    Harmonic generation
    magnetic write head
    microwave microscope
    near-field
    nonlinear Meissner effect
    RF superconductivity
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/6035
    
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    DOI
    10.1109/TASC.2010.2096531
    Abstract
    Niobium-based Superconducting Radio Frequency (SRF) cavity performance is sensitive to localized defects that give rise to quenches at high accelerating gradients. In order to identify these material defects on bulk Nb surfaces at their operating frequency and temperature, it is important to develop a new kind of wide bandwidth microwave microscopy with localized and strong RF magnetic fields. By taking advantage of write head technology widely used in the magnetic recording industry, one can obtain ̃200 mT RF magnetic fields, which is on the order of the thermodynamic critical field of Nb, on sub-micron length scales on the surface of the superconductor. We have successfully induced the nonlinear Meissner effect via this magnetic write head probe on a variety of superconductors. This design should have a high spatial resolution and is a promising candidate to find localized defects on bulk Nb surfaces and thin film coatings of interest for accelerator applications. © 2010 IEEE.
    Citation to related work
    Institute of Electrical and Electronics Engineers (IEEE)
    Has part
    IEEE Transactions on Applied Superconductivity
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/6017
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