Abstract
The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dichroic detector arrays fabricated on 150-mm silicon wafers. These bolometric cameras use AlMn transition-edge sensors, coupled to feedhorns with orthomode transducers for polarization sensitivity. The first deployed camera is sensitive to both 150 and 230 GHz. Here, we present the laboratory characterization of the thermal parameters and optical efficiencies for the two newest fielded arrays, each sensitive to both 90 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.
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References
Planck Collaboration et al., A&A 594, A13 (2016)
S.W. Henderson et al., J. Low Temp. Phys. 184, 772–779 (2016)
K.N. Abazajian, et al. ArXiv e-prints (2016)
R.J. Thornton et al., ApJS 227, 21 (2016)
D. Li et al., J. Low Temp. Phys. 184(1), 66–73 (2016)
S.P. Ho et al., J. Low Temp. Phys. 184(3), 559–567 (2016)
J.T. Ward et al., in Volume 9914 of Proceedings of SPIE (2016), p. 991437
S.M. Duff et al., J. Low Temp. Phys. 184, 634–641 (2016)
S.M. Simon et al., in Volume 9914 of Proceedings of SPIE (2016), p. 991416
K.D. Irwin et al., Low Temp. Detect. 605, 301–304 (2002)
W.B. Doriese et al., J. Low Temp. Phys. 184(1), 389–395 (2016)
C.G. Pappas et al., J. Low Temp. Phys. 184, 473–479 (2016)
Y. Li et al., in Volume 9914 of Proceedings of SPIE (2016), p. 991435
K.T. Crowley et al., in Volume 9914 of Proceedings of SPIE (2016), p. 991431
G. Cataldo et al., Opt. Lett. 37, 4200 (2012)
M. Hasselfield et al., ApJS 209, 17 (2013)
S.M. Simon et al., J. Low Temp. Phys., in this Special Issue LTD17 (2018)
B.J. Koopman et al., J. Low Temp. Phys., in this Special Issue LTD17 (2018)
Acknowledgements
This work was supported by the U.S. National Science Foundation through award 1440226. The development of multichroic detectors and lenses was supported by NASA Grants NNX13AE56G and NNX14AB58G. The work of KTC and BJK was supported by NASA Space Technology Research Fellowship awards.
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Choi, S.K., Austermann, J., Beall, J.A. et al. Characterization of the Mid-Frequency Arrays for Advanced ACTPol. J Low Temp Phys 193, 267–275 (2018). https://doi.org/10.1007/s10909-018-1982-4
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DOI: https://doi.org/10.1007/s10909-018-1982-4