Measurements of DC SQUID Damping Effects on Superconducting Resonant Circuits

We present experimental measurements of SQUID-induced damping effects on strongly coupled, lumped-element resonators in the 500kHz–1 MHz frequency range. While dc SQUIDs are commonly used for sensitive readout of electromagnetic signals such as in lumped-element axion dark matter searches, coupling a dc SQUID to a resonant circuit modifies the circuit's resonance frequency, quality factor, noise, and impedance. These parameters have a direct impact on the science reach of axion dark matter detectors, making it important to understand SQUID damping contributions. We describe a helium dip probe and two-stage SQUID readout scheme used to probe SQUID damping effects. Measurements from this setup inform the design and operation of both future test platforms as well as next-generation dark-matter experiments.

[1]  L. Winslow,et al.  Projected sensitivity of DMRadio-m3 : A search for the QCD axion below , 2022, Physical Review D.

[2]  S. Uchaikin,et al.  Development of SQUID Amplifiers for Axion Search Experiments , 2019, 2019 IEEE International Superconductive Electronics Conference (ISEC).

[3]  Connor T. FitzGerald,et al.  Exclusion Limits on Hidden-Photon Dark Matter Near 2 neV from a Fixed-Frequency Superconducting Lumped-Element Resonator , 2019, Microwave Cavities and Detectors for Axion Research.

[4]  L. Winslow,et al.  First Results from ABRACADABRA-10 cm: A Search for Sub-μeV Axion Dark Matter. , 2018, Physical review letters.

[5]  K. Irwin,et al.  Optimal Impedance Matching and Quantum Limits of Electromagnetic Axion and Hidden-Photon Dark Matter Searches , 2018, 1803.01627.

[6]  G. C. Hilton,et al.  Developments in Time-Division Multiplexing of X-ray Transition-Edge Sensors , 2016, Journal of low temperature physics.

[7]  V. Popov.  SQUID-based Resonant Detection of Axion Dark Matter , 2014, 1410.6682.

[8]  Dmitry Budker,et al.  Proposal for a Cosmic Axion Spin Precession Experiment (CASPEr) , 2013, 1306.6089.

[9]  D. Prêle,et al.  Commercially Available Capacitors at Cryogenic Temperatures , 2010 .

[10]  D B Tanner,et al.  SQUID-based microwave cavity search for dark-matter axions. , 2009, Physical review letters.

[11]  Dietmar Drung,et al.  Low-noise ultra-high-speed dc SQUID readout electronics , 2006 .

[12]  John Clarke,et al.  Measurements of the dynamic input impedance of a dc SQUID , 1985 .

[13]  H. Zappe,et al.  Josephson quantum interference computer devices , 1977 .