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280 GHz focal plane unit design and characterization for the spider-2 suborbital polarimeter

Bergman, A. S., Ade, P. A. R., Akers, S., Amiri, M., Austermann, J. A., Beall, J. A., Becker, D. T., Benton, S. J., Bock, J. J., Bond, J. R., Bryan, S. A., Chiang, H. C., Contaldi, C. R., Domagalski, R. S, Doré, O., Duff, S. M., Duivenvoorden, A. J., Eriksen, H. K., Farhang, M., Filippini, J. P., Fissel, L. M., Fraisse, A. A., Freese, K., Galloway, M., Gambrel, A. E., Gandilo, N. N., Ganga, K., Grigorian, A., Gualtieri, R., Gudmundsson, J. E., Halpern, M., Hartley, J., Hasselfield, M., Hilton, G., Holmes, W., Hristov, V. V., Huang, Z., Hubmayr, J., Irwin, K. D., Jones, W. C., Khan, A., Kuo, C. L., Kermish, Z. D., Li, S., Mason, P. V., Megerian, K., Moncelsi, L., Morford, T. A., Nagy, J. M., Netterfield, C. B., Nolta, M., Osherson, B., Padilla, I. L., Racine, B., Rahlin, A. S., Redmond, S., Reintsema, C., Romualdez, L. J., Ruhl, J. E., Runyan, M. C., Ruud, T. M., Shariff, J. A., Shaw, E. C., Shiu, C., Soler, J. D., Song, X., Trangsrud, A., Tucker, Carole, Tucker, R. S., Turner, A. D., Ullom, J., van der List, J. F., Van Lanen, J., Vissers, M. R., Weber, A. C., Wehus, I. K., Wen, S., Wiebe, D. V. and Young, E. Y. 2018. 280 GHz focal plane unit design and characterization for the spider-2 suborbital polarimeter. Journal of Low Temperature Physics 193 (5-6) , pp. 1075-1084. 10.1007/s10909-018-2065-2

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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 16×16 16×16 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 ∼ ∼ 3 pW at 300 mK with a less than 6% variation across each array at 1σ 1σ . 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Springer Verlag (Germany)
ISSN: 0022-2291
Date of First Compliant Deposit: 4 October 2018
Date of Acceptance: 29 August 2018
Last Modified: 15 Mar 2020 04:55

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