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

Journal Article · Thu Nov 15 04:00:00 EST 2018 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/S10909-018-2020-2· OSTI ID:22809848

Chang, C. L.; Padin, S.; Carter, F.; Cecil, T.; Yefremenko, V. G. ^[1]; Novosad, V. ^[2]

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1. Argonne National Laboratory, High Energy Physics Division (United States)
2. Argonne National Laboratory, Materials Science Division (United States)

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.

• OSTI ID: 22809848
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 193; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMETERS
INDUCTANCE
KINETICS
MAGNETIC FIELDS
MAGNETIC FLUX
NIOBIUM NITRIDES
NOISE
QUALITY FACTOR
READOUT SYSTEMS
RESONATORS
SCREENING
SENSORS
SUPERCONDUCTIVITY
WAVEGUIDES