Abstract
Microwave SQUID multiplexing is a promising technique for multiplexing large arrays of transition edge sensors. A major bottleneck in the development and distribution of microwave SQUID multiplexer chips occurs in the time-intensive design testing and quality assurance stages. To obtain useful RF measurements, these devices must be cooled to temperatures below 500 mK. The need for a more efficient system to screen microwave multiplexer chips has grown as the number of chips requested by collaborators per year reaches into the hundreds. We have therefore assembled a test bed for microwave SQUID circuits, which decreases screening time for four 32-channel chips from 24 h in an adiabatic demagnetization refrigerator to approximately 5 h in a helium dip probe containing a closed cycle \({^3}\)He sorption refrigerator. We discuss defining characteristics of these microwave circuits and the challenges of establishing an efficient testing setup for them.
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We gratefully acknowledge support from the DOE NEUP program, the NIST Innovation in Measurement Science program and Linac Coherent Light Source operations funds.
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Wessels, A.L., Becker, D.T., Bennett, D.A. et al. A 300-mK Test Bed for Rapid Characterization of Microwave SQUID Multiplexing Circuits. J Low Temp Phys 193, 886–892 (2018). https://doi.org/10.1007/s10909-018-2048-3
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DOI: https://doi.org/10.1007/s10909-018-2048-3