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Characterization of the Mid-Frequency Arrays for Advanced ACTPol

Author(s): Choi, SK; Austermann, J; Beall, JA; Crowley, KT; Datta, R; et al

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Abstract: The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polariza- tion, using four new dichroic detector arrays fabricated on 150-mm silicon wafers. These bolometric cameras use AlMn transition-edge sensors, coupled to feedhorns with ortho- mode transducers for polarization sensitivity. The first deployed camera is sensitive to both 150 GHz and 230 GHz. Here we present the lab characterization of the thermal parameters and optical efficiencies for the two newest fielded arrays, each sensitive to both 90 GHz and 150 GHz. We provide assessments of the parameter uniformity across each array with evaluation of systematic uncertainties. Lastly, we show the arrays’ initial performance in the field.
Publication Date: 4-Jun-2018
Electronic Publication Date: 4-Jun-2018
Citation: Choi, SK, Austermann, J, Beall, JA, Crowley, KT, Datta, R, Duff, SM, Gallardo, PA, Ho, SP, Hubmayr, J, Koopman, BJ, Li, Y, Nati, F, Niemack, MD, Page, LA, Salatino, M, Simon, SM, Staggs, ST, Stevens, J, Ullom, J, Wollack, EJ. (2018). Characterization of the Mid-Frequency Arrays for Advanced ACTPol. Journal of Low Temperature Physics, 193 (3-4), 267 - 275. doi:10.1007/s10909-018-1982-4
DOI: doi:10.1007/s10909-018-1982-4
ISSN: 0022-2291
EISSN: 1573-7357
Keywords: cosmic microwave background, transition-edge sensor, Atacama Cosmology Telescope, Advanced ACTPol, detector efficiency
Pages: 267 - 275
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Low Temperature Physics
Version: Author's manuscript



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