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Simons Observatory Focal-Plane Module: In-lab Testing and Characterization Program

Author(s): Wang, Yuhan; Zheng, Kaiwen; Atkins, Zachary; Austermann, Jason; Bhandarkar, Tanay; et al

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Abstract: The Simons Observatory is a ground-based cosmic microwave background instrument to be sited in the Atacama Desert in Chile. SO will deploy 60,000 transition-edge sensors (TES) bolometers in 49 separate focal-plane modules across a suite of four telescopes covering three dichroic bands termed low frequency (LF), mid-frequency and ultra-high frequency. Each MF and UHF focal-plane module packages 1720 feedhorn-coupled detectors with cryogenic components for highly multiplexed readout using microwave SQUID multiplexing. In this paper, we describe the testing program we have developed for high-throughput validation of modules after they are assembled. The validation requires measurements of the yield, saturation powers, time constants, noise properties and optical efficiencies. Additional measurements will be performed for further characterization as needed. We describe the methods developed and demonstrate preliminary results from the initial testing of a prototype module.
Publication Date: 8-Oct-2022
Electronic Publication Date: 8-Oct-2022
Citation: Wang, Yuhan, Zheng, Kaiwen, Atkins, Zachary, Austermann, Jason, Bhandarkar, Tanay, Choi, Steve K, Duff, Shannon M, Dutcher, Daniel, Galitzki, Nicholas, Healy, Erin, Huber, Zachary B, Hubmayr, Johannes, Johnson, Bradley R, Lashner, Jack, Li, Yaqiong, McCarrick, Heather, Niemack, Michael D, Seibert, Joseph, Silva-Feaver, Maximiliano, Sonka, Rita, Staggs, Suzanne T, Vavagiakis, Eve, Xu, Zhilei. (2022). Simons Observatory Focal-Plane Module: In-lab Testing and Characterization Program. Journal of Low Temperature Physics, 209 (5-6), 944 - 952. doi:10.1007/s10909-022-02870-1
DOI: doi:10.1007/s10909-022-02870-1
ISSN: 0022-2291
EISSN: 1573-7357
Keywords: cosmic microwave background, TES bolometers, microwave SQUID multi- plexing
Pages: 944 - 952
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Low Temperature Physics
Version: Author's manuscript

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