The Simons Observatory: Large-Scale Characterization of 90/150 GHz TES Detector Modules

Dutcher, Daniel; Duff, Shannon M.; Groh, John C.; Healy, Erin; Hubmayr, Johannes; Johnson, Bradley R.; Jones, Dante; Keller, Ben; Lin, Lawrence T.; Link, Michael J.; Lucas, Tammy J.; Morgan, Samuel; Seino, Yudai; Sonka, Rita F.; Staggs, Suzanne T.; Wang, Yuhan; Zheng, Kaiwen

doi:10.21203/rs.3.rs-3547073/v1

Cited by 3 publications

References 8 publications

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Qualification of Microwave SQUID Multiplexer Chips for Simons Observatory

Jones,

Singh,

Austermann

et al. 2024

J Low Temp Phys

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The Simons Observatory is a cosmic microwave background experiment stationed atop Cerro Toco, at an elevation of 5200 ms in Chile’s Atacama Desert. The receivers of the Observatory will contain more than 60,000 transition edge sensor bolometers. In order to read out this large detector count in a scalable manner, we utilize a microwave superconducting quantum interference device (SQUID) multiplexing scheme where each detector is inductively coupled to an rf SQUID, which in turn is inductively coupled to a GHz resonator. More than 2000 SQUIDs and resonators are fabricated on a single 76.2-mm-diameter silicon wafer. To qualify wafers before integration, we cryogenically screen $$\sim$$ ∼ 10% of the devices on each wafer by use of a standard set of measurements. From these data, we report parameter value trends in 47 wafers that were fabricated in the past two years. We show good control in key parameters such as frequency placement, internal quality factor, and response to applied flux. We demonstrate a wafer acceptance yield of 86%.

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Qualification of Microwave SQUID Multiplexer Chips for Simons Observatory

Jones,

Singh,

Austermann

et al. 2024

J Low Temp Phys

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The Simons Observatory: studies of detector yield and readout noise from the first large-scale deployment of microwave multiplexing at the large aperture telescope

Satterthwaite,

Ahmed,

Bae

et al. 2024

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XII

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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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The Simons Observatory: deployment of the observatory control system and supporting infrastructure

Koopman,

Bhimani,

Galitzki

et al. 2024

Software and Cyberinfrastructure for Astronomy VIII

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The Simons Observatory (SO) is a cosmic microwave background (CMB) observatory consisting of three small aperture telescopes and one large aperture telescope. SO is located in the Atacama Desert in Chile at an elevation of 5180m. Distributed among the four telescopes are over 60,000 transition-edge sensor (TES) bolometers across six spectral bands centered between 27 and 280 GHz. A large collection of ancillary hardware devices which produce lower rate "housekeeping" data are used to support the detector data collection.We developed a distributed control system, which we call the observatory control system (ocs), to coordinate data collection among all systems within the observatory. ocs is a core component of the deployed site software, interfacing with all on-site hardware. Alongside ocs we utilize a combination of internally and externally developed open source projects to enable remote monitoring, data management, observation coordination, and data processing.Deployment of a majority of the software is done using Docker containers. The deployment of software packages is partially done via automated Ansible scripts, utilizing a GitOps based approach for updating infrastructure on site. We describe an overview of the software and computing systems deployed within SO, including how those systems are deployed and interact with each other. We also discuss the timing distribution system and its configuration as well as lessons learned during the deployment process and where we plan to make future improvements.

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The Simons Observatory: Large-Scale Characterization of 90/150 GHz TES Detector Modules

Cited by 3 publications

References 8 publications

Qualification of Microwave SQUID Multiplexer Chips for Simons Observatory

Qualification of Microwave SQUID Multiplexer Chips for Simons Observatory

The Simons Observatory: studies of detector yield and readout noise from the first large-scale deployment of microwave multiplexing at the large aperture telescope

The Simons Observatory: deployment of the observatory control system and supporting infrastructure

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