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Radio-Frequency Resonances and Damping in Metallic Magnetic Calorimeter Sensors

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Abstract

Metallic magnetic calorimeters (MMCs) are particle detectors that combine ultra-high energy resolution with a predictable and smooth response based on the physics of paramagnetism. For best energy resolution, MMCs are read out with dc SQUID preamplifiers. Since the ac Josephson effect also makes dc SQUIDs broadband RF sources in the 1–100 GHz range, the SQUID can potentially excite RF modes of the MMC sensor, with negative consequences. The importance of this possibility is magnified in direct-coupled MMCs, where the MMC sensor is part of the SQUID loop to maximize performance. For these reasons, the RF behavior of MMC sensors must be investigated. In this report, we present the results of exploratory RF simulations of MMC sensor modes and damping, and we assess three approaches to damp the parallel-meander direct-coupled MMC without excessive noise increase.

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Acknowledgements

This work was funded by the National Nuclear Security Administration of the Department of Energy, Office of International Nuclear Safeguards. It was performed under the auspices of the U.S. DOE by LLNL under Contract No. DE-AC52-07NA27344. • Data used in this work will be made available upon reasonable request. • LLNL-JRNL-828692

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Authors and Affiliations

  1. University of New Mexico, Albuquerque, NM, 87131, USA

    S. T. P. Boyd

  2. Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA

    G.-B. Kim & S. Friedrich

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  1. S. T. P. Boyd
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  2. G.-B. Kim
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  3. S. Friedrich
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Correspondence to S. T. P. Boyd.

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Boyd, S.T.P., Kim, GB. & Friedrich, S. Radio-Frequency Resonances and Damping in Metallic Magnetic Calorimeter Sensors. J Low Temp Phys 209, 534–539 (2022). https://doi.org/10.1007/s10909-022-02790-0

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  • DOI: https://doi.org/10.1007/s10909-022-02790-0

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