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Characterization of Aliased Noise in the Advanced ACTPol Receiver

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Abstract

Advanced ACTPol is the second-generation polarization-sensitive upgrade to the \(6\, {\mathrm{m}}\) aperture Atacama Cosmology Telescope (ACT), which increased detector count and frequency coverage compared to the previous ACTPol receiver. Advanced ACTPol utilizes a new two-stage time-division multiplexing readout architecture based on superconducting quantum interference devices to achieve a multiplexing factor as high as 64 (rows), fielding a 2012 detector camera at 150/220 GHz and two 90/150 GHz cameras containing 1716 detectors each. In a time-domain system, aliasing introduces noise to the readout. In this work we present a figure of merit to measure this noise contribution and present measurements of the aliased noise fraction of the Advanced ACTPol receiver as deployed.

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Acknowledgements

The authors thank Max Fankhanel and Rodrigo Quiroga for helping with the site operations during the measurements presented here. Comments on this draft were received from two anonymous reviewers.

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Authors and Affiliations

  1. Department of Physics, Cornell University, Ithaca, NY, 14850, USA

    P. A. Gallardo, M. D. Niemack, N. F. Cothard & C. J. Duell

  2. National Institute of Standards and Technology, 325 Broadway, Boulder, CO, 80305, USA

    J. E. Austermann, J. Beall, S. M. Duff, G. C. Hilton, J. Hubmayr, C. D. Reintsema, J. N. Ullom, J. Van Lanen & M. R. Vissers

  3. Kavli Institute for Particle Astrophysics and Cosmology, Menlo Park, CA, 94025, USA

    S. W. Henderson

  4. SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA

    S. W. Henderson

  5. Department of Physics, Princeton University, Princeton, NJ, 08540, USA

    S. P. Ho

  6. Stanford University, 382 Via Pueblo, Stanford, CA, 94305, USA

    M. Salatino

  7. Kavli Institute for Particle Astrophysics and Cosmology, 452 Lomita Mall, Stanford, CA, 94305, USA

    M. Salatino

  8. Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD, 20771, USA

    E. J. Wollack

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  1. P. A. Gallardo
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  2. M. D. Niemack
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  3. J. E. Austermann
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  10. S. P. Ho
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  11. J. Hubmayr
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  12. C. D. Reintsema
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  14. J. N. Ullom
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  15. J. Van Lanen
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Correspondence to P. A. Gallardo.

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Gallardo, P.A., Niemack, M.D., Austermann, J.E. et al. Characterization of Aliased Noise in the Advanced ACTPol Receiver. J Low Temp Phys 199, 762–770 (2020). https://doi.org/10.1007/s10909-020-02344-2

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