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Simons Observatory Microwave SQUID Multiplexing Readout: Cryogenic RF Amplifier and Coaxial Chain Design

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Abstract

The Simons Observatory (SO) is an upcoming polarization-sensitive cosmic microwave background experiment on the Cerro Toco Plateau (Chile) with large overlap with other optical and infrared surveys (e.g., DESI, LSST, HSC). To enable the readout of \({\mathcal {O}}\)(10,000) detectors in each of the four telescopes of SO, we will employ the microwave SQUID multiplexing technology. With a targeted multiplexing factor of \({\mathcal {O}}\)(1000), microwave SQUID multiplexing has never been deployed on the scale needed for SO. Here we present the design of the cryogenic coaxial cable and RF component chain that connects room temperature readout electronics to superconducting resonators that are coupled to transition edge sensor bolometers operating at sub-Kelvin temperatures. We describe design considerations including cryogenic RF component selection, system linearity, noise, and thermal power dissipation.

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Notes

  1. From COAX CO., LTD. http://www.coax.co.jp/en/.

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Acknowledgements

This work was supported in part by a Grant from the Simons Foundation (Award # 457687).

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Authors and Affiliations

  1. Lawrence Berkeley National Laboratory, Berkeley, CA, USA

    Mayuri Sathyanarayana Rao, Peter Ashton, Akito Kusaka & Adrian T. Lee

  2. University of California San Diego, San Diego, CA, USA

    Maximiliano Silva-Feaver, Kam Arnold, Nicholas Galitzki, Joseph Seibert & Grant Teply

  3. University of California Berkeley, Berkeley, CA, USA

    Aamir Ali, Peter Ashton, Akito Kusaka, Adrian T. Lee, Aashrita Mangu, Christopher Raum, Trevor Sasse & Benjamin Westbrook

  4. Kavli IPMU, Kashiwa, Chiba, Japan

    Peter Ashton & Akito Kusaka

  5. NIST, Boulder, CO, USA

    Bradley J. Dober, Shannon M. Duff & Joel Ullom

  6. Cornell University, Ithaca, NY, USA

    Cody J. Duell, Michael D. Niemack, Jason R. Stevens & Eve M. Vavagiakis

  7. Princeton University, Princeton, NJ, USA

    Erin Healy, Shuay-Pwu Patty Ho, Heather McCarrick & Suzanne Staggs

  8. SLAC National Accelerator Laboratory, Menlo Park, CA, USA

    Shawn Henderson

  9. Arizona State University, Tempe, AZ, USA

    Jonathan Hoh, Justin Mathewson, Philip Mauskopf & Jenna Moore

  10. University of Pennsylvania, Philadelphia, PA, USA

    Anna M. Kofman, Zhilei Xu & Ningfeng Zhu

  11. KIPAC/Stanford University, Standford, CA, USA

    Maria Salatino

  12. University of Michigan, Ann Arbor, MI, USA

    Sara M. Simon

  13. West Chester University of Pennsylvania, West Chester, PA, USA

    Robert Thornton

Authors
  1. Mayuri Sathyanarayana Rao
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  2. Maximiliano Silva-Feaver
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  3. Aamir Ali
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  4. Kam Arnold
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  5. Peter Ashton
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  6. Bradley J. Dober
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  7. Cody J. Duell
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  9. Nicholas Galitzki
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  10. Erin Healy
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  11. Shawn Henderson
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  12. Shuay-Pwu Patty Ho
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  13. Jonathan Hoh
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  14. Anna M. Kofman
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  15. Akito Kusaka
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  16. Adrian T. Lee
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  17. Aashrita Mangu
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  18. Justin Mathewson
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  19. Philip Mauskopf
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  20. Heather McCarrick
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  21. Jenna Moore
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  22. Michael D. Niemack
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  23. Christopher Raum
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  24. Maria Salatino
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  25. Trevor Sasse
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  26. Joseph Seibert
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  27. Sara M. Simon
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  28. Suzanne Staggs
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  29. Jason R. Stevens
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  30. Grant Teply
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  31. Robert Thornton
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  32. Joel Ullom
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  33. Eve M. Vavagiakis
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  34. Benjamin Westbrook
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  35. Zhilei Xu
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  36. Ningfeng Zhu
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Corresponding author

Correspondence to Mayuri Sathyanarayana Rao.

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Maximiliano Silva-Feaver have provided significant contribution to this work.

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Sathyanarayana Rao, M., Silva-Feaver, M., Ali, A. et al. Simons Observatory Microwave SQUID Multiplexing Readout: Cryogenic RF Amplifier and Coaxial Chain Design. J Low Temp Phys 199, 807–816 (2020). https://doi.org/10.1007/s10909-020-02429-y

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