Kavli Affiliate: Zeeshan Ahmed
| First 5 Authors: Thomas P. Satterthwaite, Zeeshan Ahmed, Kyuyoung Bae, Mark Devlin, Simon Dicker
| Summary:
The Simons Observatory is a new ground-based cosmic microwave background
experiment, which is currently being commissioned in Chile’s Atacama Desert.
During its survey, the observatory’s small aperture telescopes will map 10% of
the sky in bands centered at frequencies ranging from 27 to 280 GHz to
constrain cosmic inflation models, and its large aperture telescope will map
40% of the sky in the same bands to constrain cosmological parameters and use
weak lensing to study large-scale structure. To achieve these science goals,
the Simons Observatory is deploying these telescopes’ receivers with 60,000
state-of-the-art superconducting transition-edge sensor bolometers for its
first five year survey. Reading out this unprecedented number of cryogenic
sensors, however, required the development of a novel readout system. The SMuRF
electronics were developed to enable high-density readout of superconducting
sensors using cryogenic microwave SQUID multiplexing technology. The
commissioning of the SMuRF systems at the Simons Observatory is the largest
deployment to date of microwave multiplexing technology for transition-edge
sensors. In this paper, we show that a significant fraction of the systems
deployed so far to the Simons Observatory’s large aperture telescope meet
baseline specifications for detector yield and readout noise in this early
phase of commissioning.
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