Measurements of DC SQUID Damping Effects on Superconducting Resonant Circuits

Journal Article · 24 August 2023 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/tasc.2023.3261261 · OSTI ID:1999401

van Assendelft, E. C.  ^[1]; Cho, H. -M.  ^[2]; Corbin, J. ^[3]; Kuentsner, S.  ^[3]; Li, D. ^[2]; Phipps, A.  ^[4]; Rapidis, N. M.  ^[3]; Singh, J.  ^[3]; Wells, K. ^[3]; Irwin, K. D.  ^[3]

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1. Stanford Univ., CA (United States); SLAC
2. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
3. Stanford Univ., CA (United States)
4. California State Univ., East Bay, Hayward, CA (United States)

Here, 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.

• Research Organization: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1999401
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 33; ISSN 1051-8223
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English