Abstract
The Simons Array (SA) is a cosmic microwave background (CMB) polarization experiment comprised of three telescopes that will observe the CMB at 90, 150, 220, and 270 GHz with more than 22,000 Transition Edge Sensor (TES) bolometers. The cryogenic receivers inside each telescope are named POLARBEAR-2a, POLARBEAR-2b, and POLARBEAR-2c (PB-2a, PB-2b, and PB-2c, respectively). To allow for the large number of detectors, SA uses frequency-division multiplexing with multiplexing factor of 40. We describe the process developed to assemble the readout circuit repeatably for SA. After assembly, we characterize the readout circuit and TESs at cryogenic temperatures in a condition of negligible incident optical power. Impedances in the readout circuit bias our estimates of TES parameters, and we describe a method to account for this.
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References
The POLARBEAR Collaboration, SPIE Proc. 9914, 9 (2016). https://doi.org/10.1117/12.2233103/SPIE
M.A. Dobbs, M. Lueker et al., Rev. Sci. Instrum. 83(7), 073113 (2012)
K. Hattori et al., J. Low Temp. Phys. 184, 3–4 (2016). https://doi.org/10.1007/s10909-015-1425-4
J.S. Avva et al., J. Low Temp. Phys. This Special Issue LTD17 (2018)
K. Rotermund et al., J. Low Temp. Phys. 184, 486–491 (2016). https://doi.org/10.1007/s/10909-016-1554-4
B. Westbrook et al., J. Low Temp. Phys. This Special Issue LTD17 (2018)
K. Bandura et al., J. Astron. Instrum. 05, 1641005 (2016). https://doi.org/10.1142/S2251171716410051
Acknowledgements
The Polarbear project is funded by the National Science Foundation under Grants AST-0618398 and AST-1212230. The Simons Array expansion of Polarbear is funded by The Simons Foundation. The KEK authors were supported by MEXT KAKENHI Grant No. 21111002, and acknowledge support from KEK Cryogenics Science Center. The McGill authors acknowledge funding from the Natural Sciences and Engineering Research Council of Canada, the Canada Research Chairs Program, and Canadian Institute for Advanced Research. All silicon wafer-based technology for Simons Array will be fabricated at the UC Berkeley Nanolab and the UCSD Nano3 Microfabrication Laboratory. The James Ax Observatory operates in the Parque Astronómico Atacama in Northern Chile under the auspices of the Comisión Nacional de Investigación Científica y Tecnológica de Chile (CONICYT). DB is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under Award AST-1501422.
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Elleflot, T., Akiba, Y., Arnold, K. et al. Detector and Readout Assembly and Characterization for the Simons Array. J Low Temp Phys 193, 1094–1102 (2018). https://doi.org/10.1007/s10909-018-2058-1
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DOI: https://doi.org/10.1007/s10909-018-2058-1