On-sky performance of the SPT-3G frequency-domain multiplexed readout
Abstract
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 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.
Keywords
Cite
@article{arxiv.1907.10947,
title = {On-sky performance of the SPT-3G frequency-domain multiplexed readout},
author = {A. N. Bender and A. J. Anderson and J. S. Avva and P. A. R. Ade and Z. Ahmed and P. S. Barry and R. Basu Thakur and B. A. Benson and L. Bryant and K. Byrum and J. E. Carlstrom and F. W. Carter and T. W. Cecil and C. L. Chang and H. -M. Cho and J. F. Cliche and A. Cukierman and T. de Haan and E. V. Denison and J. Ding and M. A. Dobbs and D. Dutcher and W. Everett and K. R. Ferguson and A. Foster and J. Fu and J. Gallicchio and A. E. Gambrel and R. W. Gardner and A. Gilbert and J. C. Groh and S. Guns and R. Guyser and N. W. Halverson and A. H. Harke-Hosemann and N. L. Harrington and J. W. Henning and G. C. Hilton and W. L. Holzapfel and D. Howe and N. Huang and K. D. Irwin and O. B. Jeong and M. Jonas and A. Jones and T. S. Khaire and A. M. Kofman and M. Korman and D. L. Kubik and S. Kuhlmann and C. -L. Kuo and A. T. Lee and E. M. Leitch and A. E. Lowitz and S. S. Meyer and D. Michalik and J. Montgomery and A. Nadolski and T. Natoli and H. Nguyen and G. I. Noble and V. Novosad and S. Padin and Z. Pan and P. Paschos and J. Pearson and C. M. Posada and W. Quan and A. Rahlin and D. Riebel and J. E. Ruhl and J. T. Sayre and E. Shirokoff and G. Smecher and J. A. Sobrin and A. A. Stark and J. Stephen and K. T. Story and A. Suzuki and K. L. Thompson and C. Tucker and L. R. Vale and K. Vanderlinde and J. D. Vieira and G. Wang and N. Whitehorn and V. Yefremenko and K. W. Yoon and M. R. Young},
journal= {arXiv preprint arXiv:1907.10947},
year = {2020}
}
Comments
9 pages, 5 figures submitted to the Journal of Low Temperature Physics: LTD18 Special Edition