Characterization and performance of the second-year SPT-3G focal plane

The third-generation instrument for the 10-meter South Pole Telescope, SPT-3G, was first installed in January 2017. In addition to completely new cryostats, secondary telescope optics, and readout electronics, the number of detectors in the focal plane has increased by an order of magnitude from pre...

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Published in:arXiv.org 2018-08
Main Authors: Dutcher, D, Ade, P A R, Ahmed, Z, Anderson, A J, Avva, J S, R Basu Thakur, Bender, A N, Benson, B A, Carlstrom, J E, Carter, F W, Cecil, T W, Chang, C L, Cliche, J F, Cukierman, A, de Haan, T, Ding, J, Dobbs, M A, 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, Holzapfel, W L, Huang, N, Irwin, K D, Jeong, O B, Jonas, M, Khaire, T S, Kofman, A M, Korman, M, Kubik, D L, Kuhlmann, S, C -L Kuo, Lee, A T, 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, Rahlin, A, 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, Vanderlinde, K, Vieira, J D, Wang, G, Whitehorn, N, Yefremenko, V, Yoon, K W, Young, M R
Format: Article
Language:English
Subjects:
Arrays
Bolometers
Broadband
Cryostats
Dual polarization (waves)
Electronic filters
Focal plane
Frequencies
Infrared radiation
Linear polarization
Mapping
Microstrip devices
Pixels
Power efficiency
Sensors
Silicon wafers
South Pole
Superconductivity
Transition temperature
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Summary:The third-generation instrument for the 10-meter South Pole Telescope, SPT-3G, was first installed in January 2017. In addition to completely new cryostats, secondary telescope optics, and readout electronics, the number of detectors in the focal plane has increased by an order of magnitude from previous instruments to ~16,000. The SPT-3G focal plane consists of ten detector modules, each with an array of 269 trichroic, polarization-sensitive pixels on a six-inch silicon wafer. Within each pixel is a broadband, dual-polarization sinuous antenna; the signal from each orthogonal linear polarization is divided into three frequency bands centered at 95, 150, and 220 GHz by in-line lumped element filters and transmitted via superconducting microstrip to Ti/Au transition-edge sensor (TES) bolometers. Properties of the TES film, microstrip filters, and bolometer island must be tightly controlled to achieve optimal performance. For the second year of SPT-3G operation, we have replaced all ten wafers in the focal plane with new detector arrays tuned to increase mapping speed and improve overall performance. Here we discuss the TES superconducting transition temperature and normal resistance, detector saturation power, bandpasses, optical efficiency, and full array yield for the 2018 focal plane.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.00033