On-sky performance of the SPT-3G frequency-domain multiplexed readout

Frequency-domain multiplexing (fMux) is an established technique for the readout of large arrays of transition edge sensor (TES) bolometers. Each TES in a multiplexing module has a unique AC voltage bias that is selected by a resonant filter. This scheme enables the operation and readout of multiple...

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Veröffentlicht in:	arXiv.org 2019-07
Hauptverfasser:	Bender, A N, Anderson, A J, Avva, J S, Ade, P A R, Ahmed, Z, Barry, P S, R Basu Thakur, Benson, B A, Bryant, L, Byrum, K, Carlstrom, J E, Carter, F W, Cecil, T W, Chang, C L, H -M Cho, Cliche, J F, Cukierman, A, de Haan, T, Denison, E V, Ding, J, Dobbs, M A, Dutcher, D, Everett, W, Ferguson, K R, Foster, A, J Fu, Gallicchio, J, Gambrel, A E, Gardner, R W, Gilbert, A, Groh, J C, Guns, S, Guyser, R, Halverson, N W, Harke-Hosemann, A H, Harrington, N L, Henning, J W, Hilton, G C, Holzapfel, W L, Howe, D, Huang, N, Irwin, K D, Jeong, O B, Jonas, M, Jones, A, Khaire, T S, Kofman, A M, Korman, M, Kubik, D L, Kuhlmann, S, C -L Kuo, 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, Paschos, P, Pearson, J, Posada, C M, Quan, W, Rahlin, A, Riebel, D, Ruhl, J E, Sayre, J T, Shirokoff, E, Smecher, G, Sobrin, J A, Stark, A A, Stephen, J, Story, K T, Suzuki, A, Thompson, K L, Tucker, C, Vale, L R, Vanderlinde, K, Vieira, J D, Wang, G, Whitehorn, N, Yefremenko, V, Yoon, K W, Young, M R
Format:	Artikel
Sprache:	eng
Schlagworte:	Balances (scales) Bolometers Frequency domain analysis Knee Multiplexing Noise Noise levels Photons Physics - Instrumentation and Detectors Physics - Instrumentation and Methods for Astrophysics Sensor arrays South Pole White noise
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Zusammenfassung:	Frequency-domain multiplexing (fMux) is an established technique for the readout of large arrays of transition edge sensor (TES) bolometers. Each TES in a multiplexing module has a unique AC voltage bias that is selected by a resonant filter. This scheme enables the operation and readout of multiple bolometers on a single pair of wires, reducing thermal loading onto sub-Kelvin stages. The current receiver on the South Pole Telescope, SPT-3G, uses a 68x fMux system to operate its large-format camera of \(\sim\)16,000 TES bolometers. We present here the successful implementation and performance of the SPT-3G readout as measured on-sky. Characterization of the noise reveals a median pair-differenced 1/f knee frequency of 33 mHz, indicating that low-frequency noise in the readout will not limit SPT-3G's measurements of sky power on large angular scales. Measurements also show that the median readout white noise level in each of the SPT-3G observing bands is below the expectation for photon noise, demonstrating that SPT-3G is operating in the photon-noise-dominated regime.
ISSN:	2331-8422
DOI:	10.48550/arxiv.1907.10947