Abstract
The microwave SQUID multiplexer (\(\mu \)MUX) is a high channel-count multiplexer that, when coupled to low-temperature detectors such as Transition Edge Sensor (TES) Bolometers, has applications across astronomy and physics. Our primary application is for the Simons Observatory, an array of CMB polarimeters utilizing over 70,000 \(\mu \)MUX readout channels, located in the Atacama Desert. To facilitate the delivery of high-quality multiplexers to the project, we have developed a high-throughput microwave SQUID screening measurement system, capable of measuring microwave devices operating over the frequency range of 4–8 GHz. Here, we present the hardware design comprised of a cryogen-free 100 mK 2-stage Adiabatic Demagnetization Refrigerator (ADR) cryostat, microwave packages which hold \(\mu \)MUX chips, and the microwave readout chain necessary to do these measurements. In addition, we describe the screening protocols and show example results.
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Notes
Radiall R573.453.625, Certain commercial instruments are identified to specify the experimental study adequately. This does not imply endorsement by NIST or that the instruments are the best available for the purpose.
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Acknowledgements
This work was supported in part by a grant from the Simons Foundation (Award #457687, B.K.). It is in compliance with ethical standards and there are no conflicts of interest.
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Whipps, Z., Connors, J.A., Dober, B.J. et al. A High-Capacity Microwave SQUID Multiplexer Chip Screening System. J Low Temp Phys 211, 330–337 (2023). https://doi.org/10.1007/s10909-023-02954-6
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DOI: https://doi.org/10.1007/s10909-023-02954-6