Nanoscale nonlinear radio frequency properties of bulk Nb: Origins of extrinsic nonlinear effects

Tamin Tai, B. G. Ghamsari, T. Bieler, Steven M. Anlage

    Research output: Contribution to journalArticle

    • 4 Citations

    Abstract

    The performance of niobium-based superconducting radio frequency (SRF) particle-accelerator cavities can be 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, a wide-bandwidth microwave microscope with localized and strong RF magnetic fields is developed by integrating a magnetic write head into the near-field microwave microscope to enable mapping of the local electrodynamic response in the multi-GHz frequency regime at cryogenic temperatures. This magnetic writer demonstrates a localized and strong RF magnetic field on bulk Nb surface with Bsurface>102 mT and submicron resolution. By measuring the nonlinear response of the superconductor, nonlinearity coming from the nanoscale weak-link Josephson junctions due to the contaminated surface in the cavity-fabrication process is demonstrated.

    Original languageEnglish (US)
    Article number134513
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume92
    Issue number13
    DOIs
    StatePublished - Oct 16 2015

    Profile

    Edema Disease of Swine
    radio frequencies
    microscopes
    microwaves
    cavities
    defects
    magnetic fields
    Acetanilides
    Factor XI Deficiency
    Calcium-Transporting ATPases
    Microwaves
    Defects
    Microscopes
    Magnetic fields
    Temperature
    particle accelerators
    cryogenic temperature
    niobium
    electrodynamics
    Josephson junctions

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Nanoscale nonlinear radio frequency properties of bulk Nb : Origins of extrinsic nonlinear effects. / Tai, Tamin; Ghamsari, B. G.; Bieler, T.; Anlage, Steven M.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 13, 134513, 16.10.2015.

    Research output: Contribution to journalArticle

    Tai, Tamin; Ghamsari, B. G.; Bieler, T.; Anlage, Steven M. / Nanoscale nonlinear radio frequency properties of bulk Nb : Origins of extrinsic nonlinear effects.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 92, No. 13, 134513, 16.10.2015.

    Research output: Contribution to journalArticle

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