The Simons Observatory Microwave SQUID Multiplexing Detector Module Design
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 (μmux). Simons Observatory will use 49 modules containing 70,000 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
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Contributing Organization:
- The Simons Observatory
- Grant/Contract Number:
- AC02-07CH11359; AC02-76SF00515; AC02-05CH11231
- OSTI ID:
- 1836572
- Alternate ID(s):
- OSTI ID: 1846410; OSTI ID: 1863019; OSTI ID: 1961802
- Report Number(s):
- FERMILAB-PUB-21-719-PPD; arXiv:2106.14797; oai:inspirehep.net:1870632; TRN: US2300356
- Journal Information:
- The Astrophysical Journal, Vol. 922, Issue 1; ISSN 0004-637X
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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