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Full-scale Microwave SQUID Multiplexer Readout System for Magnetic Microcalorimeters

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arxiv 2509.07671 v1 pith:7RS5XJHP submitted 2025-09-09 physics.ins-det cond-mat.supr-con

Full-scale Microwave SQUID Multiplexer Readout System for Magnetic Microcalorimeters

M. Neidig , T. Muscheid , R. Gartmann , L. E. Ardila Perez , M. Wegner , O. Sander , S. Kempf This is my paper
classification physics.ins-det cond-mat.supr-con
keywords readoutsystemsquidmicrowavemultiplexingarraysfull-scalelarge
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The deployment of large cryogenic detector arrays, comprising hundreds to thousands of individual detectors, is highly beneficial for various cutting-edge applications, requiring large statistics, angular resolution or imaging capabilities. The readout of such arrays, however, presents a major challenge in terms of system complexity, parasitic heat load, and cost, which can be overcome only through multiplexing. Among the various multiplexing approaches, microwave SQUID multiplexing currently represents the state of the art, in particular for magnetic microcalorimeter (MMC) readout. In this work, we demonstrate the successful operation of the latest generation of our microwave SQUID multiplexer-based readout system, based on a SQUID multiplexer tailored for MMC readout and a custom full-scale software-defined radio (SDR) electronics, capable of handling up to 400 channels. The system operates reliably across the entire 4-8 GHz frequency band and achieves sufficiently low flux noise levels in flux-ramp-demodulated readout. Our results confirm that our system is fully functional and provides a scalable path towards future large-scale, high-resolution MMC experiments.

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Cited by 1 Pith paper

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  1. Characterization of Aluminum Microwave SQUID Multiplexers for CE$\nu$NS Detection

    physics.ins-det 2026-05 conditional novelty 4.0

    Characterization of an aluminum μMUX prototype reports flux sensitivities of 1-1.5 μΦ₀/√Hz (open-loop) and 0.3-0.6 μΦ₀/√Hz (with JTWPA), validating the technology for TES readout in CEνNS detection.