The microwave SQUID multiplexer (umux) has enabled higher bandwidth or higher channel counts across a wide range of experiments in particle physics, astronomy, and spectroscopy. The large multiplexing factor coupled with recent commercial availability of microwave components and warm electronics readout systems make it an attractive candidate for systems requiring large cryogenic detector counts. Since the multiplexer is considered for both bolometric and calorimetric applications across several orders of magnitude of signal frequencies, understanding the bandwidth of the device and its interaction with readout electronics is key to appropriately designing and engineering systems. Here we discuss several important factors contributing to the bandwidth properties of umux systems, including the intrinsic device bandwidth, interactions with warm electronics readout systems, and aliasing. We present simulations and measurements of umux devices coupled with SLAC Microresonator RF (SMuRF) tone-tracking electronics and discuss several implications for future experimental design.
@article{arxiv.2206.09066,
title = {Bandwidth and Aliasing in the Microwave SQUID Multiplexer},
author = {Cyndia Yu and Zeeshan Ahmed and Jake A. Connors and J. Mitch D'Ewart and Bradley Dober and Josef C. Frisch and Shawn W. Henderson and Gene C. Hilton and Johannes Hubmayr and Stephen E. Kuenstner and J. A. Ben Mates and Maximiliano Silva-Feaver and Joel N. Ullom and Leila R. Vale and Dan Van Winkle and Edward Young},
journal= {arXiv preprint arXiv:2206.09066},
year = {2022}
}
Comments
Proceedings for Low Temperature Physics 2021, accepted for publication in Journal of Low Temperature Physics. 8 pages (including references), 5 figures