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Bender, A. N.; Ade, P. A. R.; Ahmed, Z.; Anderson, A. J.; Avva, J. S.; Aylor, K.; Barry, P. S.; Thakur, R. Basu; Benson, B. A.; Bleem, L. S.; Bocquet, S.; Byrum, K.; Carlstrom, J. E.; Carter, F. W.; Cecil, T. W.; Chang, C. L.; Cho, H.-M.; Cliche, J. F.; Crawford, T. M.; Cukierman, A.; de Haan, T.; Denison, E. V.; Ding, J.; Dobbs, M. A.; Dodelson, S.; Dutcher, D.; Everett, W.; Foster, A.; Gallicchio, J.; Gilbert, A.; Groh, J. C.; Guns, S. T.; Halverson, N. W.; Harke-Hosemann, A. H.; Harrington, N. L.; Henning, J. W.; Hilton, G. C.; Holder, G. P.; Holzapfel, W. L.; Huang, N.; Irwin, K. D.; Jeong, O. B.; Jonas, M.; Jones, A.; Khaire, T. S.; Knox, L.; Kofman, A. M.; Korman, M.; Kubik, D. L.; Kuhlmann, S.; Kuo, C.-L.; Lee, A. T.; Leitch, E. M.; Lowitz, A. E.; Meyer, S. S.; Michalik, D.; Montgomery, J.; Nadolski, A.; Natoli, T.; Nguyen, H.; Noble, G. I.; Novosad, V.; Padin, S.; Pan, Z.; Pearson, J.; Posada, C. M.; Quan, W.; Raghunathan, S.; Rahlin, A.; Reichardt, C. L.; Ruhl, J. E.; Sayre, J. T.; Shirokoff, E.; Smecher, G.; Sobrin, J. A.; Stark, A. A.; Story, K. T.; Suzuki, A.; Thompson, K. L.; Tucker, C.; Vale, L. R.; Vanderlinde, K.; Vieira, J. D.; Wang, G.; Whitehorn, N.; Wu, W. L. K.; Yefremenko, V.; Yoon, K. W.; Young, M. R. (2018): Year two instrument status of the SPT-3G cosmic microwave background receiver. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy Ix, Vol. 10708, 1070803
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The South Pole Telescope (SPT) is a millimeter-wavelength telescope designed for high-precision measurements of the cosmic microwave background (CMB). The SPT measures both the temperature and polarization of the CMB with a large aperture, resulting in high resolution maps sensitive to signals across a wide range of angular scales on the sky. With these data, the SPT has the potential to make a broad range of cosmological measurements. These include constraining the effect of massive neutrinos on large-scale structure formation as well as cleaning galactic and cosmological foregrounds from CMB polarization data in future searches for inflationary gravitational waves. The SPT began observing in January 2017 with a new receiver (SPT-3G) containing similar to 16,000 polarization-sensitive transition-edge sensor bolometers. Several key technology developments have enabled this large-format focal plane, including advances in detectors, readout electronics, and large millimeter-wavelength optics. We discuss the implementation of these technologies in the SPT-3G receiver as well as the challenges they presented. In late 2017 the implementations of all three of these technologies were modified to optimize total performance. Here, we present the current instrument status of the SPT-3G receiver.

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