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Microwave Multiplexing on the Keck Array

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Abstract

We describe an on-sky demonstration of a microwave-multiplexing readout system in one of the receivers of the Keck Array, a polarimetry experiment observing the cosmic microwave background at the South Pole. During the austral summer of 2018–2019, we replaced the time-division multiplexing readout system with microwave-multiplexing components including superconducting microwave resonators coupled to radio frequency superconducting quantum interference devices at the sub-Kelvin focal plane, coaxial-cable plumbing and amplification between room temperature and the cold stages, and a SLAC Microresonator Radio Frequency system for the warm electronics. In the range 5–6 GHz, a single coaxial cable reads out 528 channels. The readout system is coupled to transition-edge sensors, which are in turn coupled to 150-GHz slot-dipole phased-array antennas. Observations began in April 2019, and we report here on an initial characterization of the system performance.

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Acknowledgements

This work was supported by the US Department of Energy, Office of Science, Contract DE-AC02-76SF00515. CY was supported by the NSF GRFP.

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Authors and Affiliations

  1. Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA

    A. Cukierman, Z. Ahmed, S. Henderson, E. Young & K. D. Irwin

  2. Department of Physics, Stanford University, Stanford, CA, 94305, USA

    A. Cukierman, E. Young, C. Yu, S. Chaudhuri, K. D. Irwin, E. Karpel, S. A. Kernasovskiy, S. E. Kuenstner, C. L. Kuo, J. Kang, K. L. Thompson, H. Yang & K. W. Yoon

  3. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA

    D. Barkats, J. Cornelison, M. Dierickx, K. S. Karkare, J. M. Kovac, A. Kovacs, T. St. Germaine, L. Zeng, H. Boenish, V. Buza, J. Connors, G. Hall, S. Harrison, B. Racine & S. Richter

  4. School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, UK

    P. A. R. Ade, R. V. Sudiwala & C. Tucker

  5. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada

    S. Fatigoni, M. Halpern, M. Amiri & D. V. Wiebe

  6. Department of Physics, California Institute of Technology, Pasadena, CA, 91125, USA

    R. Basu Thakur, J. J. Bock, H. Hui, S. Kefeli, L. Moncelsi, H. T. Nguyen, R. O’Brient, A. Schillaci, A. Soliman, B. Steinbach, A. Wandui & C. Zhang

  7. Department of Physics, University of Cincinnati, Cincinnati, OH, 45221, USA

    C. A. Bischoff, S. Palladino & C. Umiltà

  8. Jet Propulsion Laboratory, Pasadena, CA, 91109, USA

    J. J. Bock, S. R. Hildebrandt, K. G. Megerian, H. T. Nguyen, R. O’Brient, A. D. Turner & A. C. Weber

  9. Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN, 55455, USA

    J. Willmert, E. Bullock, J. Cheshire, M. Crumrine, G. Hall, K. Lau, C. Pryke & R. Schwarz

  10. Service des Basses Températures, Commissariat à l’Energie Atomique, 38054, Grenoble, France

    L. Duband

  11. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    J. P. Filippini

  12. Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA

    J. P. Filippini

  13. National Institute of Standards and Technology, Boulder, CO, 80305, USA

    B. J. Dober, G. C. Hilton, J. Hubmayr, J. A. B. Mates, J. N. Ullom, L. R. Vale & C. D. Reintsema

  14. Kavli Institute for Cosmological Physics, University of Chicago, Chicago, IL, 60637, USA

    K. S. Karkare, A. G. Vieregg & W. L. K. Wu

  15. Physics Department, Brookhaven National Laboratory, Upton, NY, 11973, USA

    C. D. Sheehy

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

    Z. Ahmed, S. Henderson, D. Brown, J. M. D’Ewart, J. Dusatko, J. C. Frisch, G. Haller, D. Li, S. Smith, D. D. Van Winkle & J. Vasquez

  17. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, CB3 0WA, UK

    T. Namikawa

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  1. A. Cukierman
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  2. Z. Ahmed
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  3. S. Henderson
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Correspondence to A. Cukierman.

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Cukierman, A., Ahmed, Z., Henderson, S. et al. Microwave Multiplexing on the Keck Array. J Low Temp Phys 199, 858–866 (2020). https://doi.org/10.1007/s10909-019-02296-2

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