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A Kinetic Inductance Ammeter with Coplanar Waveguide Input Structure for Magnetic Flux Focusing

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Abstract

We propose a multiplexible kinetic inductance ammeter, which uses a high-quality-factor, superconducting, lumped-element, kinetic inductance resonator as a current sensor, a short, superconducting coplanar waveguide (CPW) for current input, and a CPW transmission line for the sensor readout. The resonator consists of an interdigitated capacitor and a superconducting loop that inductively couples to the input CPW. Current running through the central line of the input CPW generates magnetic fields which are focused into the gaps of the input CPW. These magnetic fields can be measured collectively as the magnetic flux through the superconducting loop. The kinetic inductance of the superconducting loop depends on the screening current for the magnetic flux, so the input current is converted to a change in the frequency of the resonator. We analyze the response and noise of a kinetic inductance ammeter with a high-resistivity NbN loop.

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Acknowledgements

Work at Argonne National Laboratory, including the work at the Center for Nanoscale Materials, a US Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility, was supported by the Office of Science and Office of Basic Energy Sciences of the US Department of Energy, under Contract No. DE-AC02- 06CH11357.

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Authors and Affiliations

  1. High Energy Physics Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, IL, 60439, USA

    G. Wang, C. L. Chang, S. Padin, F. Carter, T. Cecil & V. G. Yefremenko

  2. Kavli Institute for Cosmological Physics, The University of Chicago, 5640 S Ellis Ave, Chicago, IL, 60637, USA

    C. L. Chang & S. Padin

  3. Materials Science Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, IL, 60439, USA

    V. Novosad

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  1. G. Wang
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  2. C. L. Chang
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  3. S. Padin
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  4. F. Carter
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  5. T. Cecil
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  6. V. G. Yefremenko
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  7. V. Novosad
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Correspondence to G. Wang.

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Wang, G., Chang, C.L., Padin, S. et al. A Kinetic Inductance Ammeter with Coplanar Waveguide Input Structure for Magnetic Flux Focusing. J Low Temp Phys 193, 134–140 (2018). https://doi.org/10.1007/s10909-018-2020-2

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  • DOI: https://doi.org/10.1007/s10909-018-2020-2

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