1. The Simons Observatory Microwave SQUID Multiplexing Detector Module Design
- Author
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Shannon M. Duff, Sarah Marie Bruno, Kaiwen Zheng, Jason E. Austermann, Heather McCarrick, Suzanne T. Staggs, Zachary Atkins, Sara M. Simon, Michael D. Niemack, Megan Gralla, D. Dutcher, Johannes Hubmayr, John A. B. Mates, Bradley R. Johnson, Zachary B. Huber, Leila R. Vale, Nicholas F. Cothard, Jake Connors, A. M. Kofman, Steve K. Choi, Kam Arnold, Nicholas Galitzki, Tammy J. Lucas, Jeff Van Lanen, Kevin D. Crowley, Shawn W. Henderson, Aritoki Suzuki, Yuhan Wang, C. Yu, Edward D. Young, Simon Dicker, Edward J. Wollack, Akito Kusaka, Joel N. Ullom, Bradley Dober, Erin Healy, Zeeshan Ahmed, John Orlowski-Scherer, Adrian T. Lee, Jeffrey Iuliano, Cody J. Duell, Yaqiong Li, Joseph Seibert, Robert Thornton, Jon E. Gudmundsson, Josef Frisch, Ningfeng Zhu, Tomoki Terasaki, Zhilei Xu, Jack Lashner, Tanay Bhandarkar, James A. Beall, Michael J. Link, Shuay-Pwu Patty Ho, Eve M. Vavagiakis, Maximiliano Silva-Feaver, Michael R. Vissers, Gene C. Hilton, Marius Lungu, and Jeff McMahon
- Subjects
Physics ,Squid ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,biology ,Physics::Instrumentation and Detectors ,business.industry ,Detector ,Astrophysics::Instrumentation and Methods for Astrophysics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Multiplexing ,Optics ,Space and Planetary Science ,Observatory ,biology.animal ,Astrophysics - Instrumentation and Methods for Astrophysics ,business ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Microwave ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Advances in cosmic microwave background (CMB) science depend on increasing the number of sensitive detectors observing the sky. New instruments deploy large arrays of superconducting transition-edge sensor (TES) bolometers tiled densely into ever larger focal planes. High multiplexing factors reduce the thermal loading on the cryogenic receivers and simplify their design. We present the design of focal-plane modules with an order of magnitude higher multiplexing factor than has previously been achieved with TES bolometers. We focus on the novel cold readout component, which employs microwave SQUID multiplexing ($��$mux). Simons Observatory will use 49 modules containing 60,000 bolometers to make exquisitely sensitive measurements of the CMB. We validate the focal-plane module design, presenting measurements of the readout component with and without a prototype detector array of 1728 polarization-sensitive bolometers coupled to feedhorns. The readout component achieves a $95\%$ yield and a 910 multiplexing factor. The median white noise of each readout channel is 65 $\mathrm{pA/\sqrt{Hz}}$. This impacts the projected SO mapping speed by $< 8\%$, which is less than is assumed in the sensitivity projections. The results validate the full functionality of the module. We discuss the measured performance in the context of SO science requirements, which are exceeded., Accepted to The Astrophysical Journal
- Published
- 2021
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