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SQUID Amplifier System for Vibrating Wire Resonators

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Abstract

We describe a simple coupling scheme of superconducting vibrating wire resonators to a SQUID amplifier for achieving supreme signal to noise characteristics. Our construction resulted in a gain factor near 10 8φ 0 /V at 1 kHz with an amplifier noise level of about 20 μφ 0 /\(\sqrt {{\text{Hz}}} \). Extremely small movements of the wires in very small magnetic fields can thus be detected.

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Authors and Affiliations

  1. Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015, HUT, Finland

    J. Martikainen & J. T. Tuoriniemi

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  1. J. Martikainen
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  2. J. T. Tuoriniemi
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Martikainen, J., Tuoriniemi, J.T. SQUID Amplifier System for Vibrating Wire Resonators. Journal of Low Temperature Physics 124, 367–382 (2001). https://doi.org/10.1023/A:1017554708219

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  • DOI: https://doi.org/10.1023/A:1017554708219

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