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Performance of a Phonon-Mediated Detector Using KIDs Optimized for Sub-GeV Dark Matter

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Abstract

We provide an update on a gram-scale phonon-mediated KID-based device that was designed for a sub-GeV dark matter search at the Northwestern Experimental Underground Site. Currently, the device is demonstrating 6 eV resolution on the energy absorbed by the resonator. With some important assumptions, this translates to 20 eV baseline resolution on energy deposited in the substrate. We show that TLS noise dominates this energy resolution estimate. After modifying the design to mitigate TLS noise, we project 5 eV baseline resolution on energy deposited in the substrate (1.5 eV on energy absorbed by the resonator) for an amplifier-white-noise-dominated device. Finally, we present a clear path forward to sub-eV resolutions, which includes installation of a quantum-limited superconducting parametric amplifier and adjustments to the material makeup of our resonators.

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Acknowledgements

We acknowledge the support of the following institutions and grants: NASA, NSTGRO 80NSSC20K1223; Department of Energy, DE-SC0011925F; Fermilab, LDRD Subcontract 672112.

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Authors and Affiliations

  1. Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA, 91106, USA

    O. Wen, T. Aralis, R. Basu Thakur, Y.-Y. Chang, K. Ramanathan & S. R. Golwala

  2. Jet Propulsion Laboratory, Pasadena, CA, 91106, USA

    B. Bumble

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  1. O. Wen
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  2. T. Aralis
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  3. R. Basu Thakur
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  4. B. Bumble
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  5. Y.-Y. Chang
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  6. K. Ramanathan
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  7. S. R. Golwala
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Correspondence to O. Wen.

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Wen, O., Aralis, T., Basu Thakur, R. et al. Performance of a Phonon-Mediated Detector Using KIDs Optimized for Sub-GeV Dark Matter. J Low Temp Phys 209, 510–517 (2022). https://doi.org/10.1007/s10909-022-02764-2

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  • DOI: https://doi.org/10.1007/s10909-022-02764-2

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