Abstract
We describe the construction and characterization of the 280 GHz bolometric focal plane units (FPUs) to be deployed on the second flight of the balloon-borne Spider instrument. These FPUs are vital to Spider’s primary science goal of detecting or placing an upper limit on the amplitude of the primordial gravitational wave signature in the cosmic microwave background (CMB) by constraining the B-mode contamination in the CMB from Galactic dust emission. Each 280 GHz focal plane contains a \(16 \times 16\) grid of corrugated silicon feedhorns coupled to an array of aluminum–manganese transition-edge sensor (TES) bolometers fabricated on 150 mm diameter substrates. In total, the three 280 GHz FPUs contain 1530 polarization-sensitive bolometers (765 spatial pixels) optimized for the low loading environment in flight and read out by time-division SQUID multiplexing. In this paper, we describe the mechanical, thermal, and magnetic shielding architecture of the focal planes and present cryogenic measurements which characterize yield and the uniformity of several bolometer parameters. The assembled FPUs have high yields, with one array as high as 95% including defects from wiring and readout. We demonstrate high uniformity in device parameters, finding the median saturation power for each TES array to be \(\sim \)3 pW at 300 mK with a less than 6% variation across each array at \(1\sigma \). These focal planes will be deployed alongside the 95 and 150 GHz telescopes in the Spider-2 instrument, slated to fly from McMurdo Station in Antarctica in December 2018.
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Acknowledgements
Spider is supported in the USA by the National Aeronautics and Space Administration under Grant Nos. NNX17AC55G and NNX12AE95G issued through the Science Mission Directorate and by the National Science Foundation through PLR-1043515. Additional support is provided by the Department of Energy Grant DE-SC007859. Corresponding author is supported by a National Science Foundation Graduate Research Fellowship. Logistical support for the Antarctic deployment and operations was provided by the NSF through the U.S. Antarctic Program. Support in Canada is provided by the National Sciences and Engineering Council and the Canadian Space Agency. Support in Norway is provided by the Research Council of Norway. Support in Sweden is provided by the Swedish Research Council through the Oskar Klein Centre (Contract No. 638-2013-8993). We also wish to acknowledge the generous support of the David and Lucile Packard Foundation, which has been crucial to the success of the project. The collaboration is grateful to the British Antarctic Survey, particularly Sam Burrell, for invaluable assistance with data and payload recovery after the 2015 flight.
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Bergman, A.S., Ade, P.A.R., Akers, S. et al. 280 GHz Focal Plane Unit Design and Characterization for the Spider-2 Suborbital Polarimeter. J Low Temp Phys 193, 1075–1084 (2018). https://doi.org/10.1007/s10909-018-2065-2
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DOI: https://doi.org/10.1007/s10909-018-2065-2