Small Aperture Telescopes for the Simons Observatory

Aamir M. Ali, Shunsuke Adachi, Kam Arnold, Peter Ashton, Andrew Bazarko, Yuji Chinone, Gabriele Coppi, Lance Corbett, Kevin D. Crowley, Kevin T. Crowley, Mark Devlin, Simon Dicker, Shannon Duff, Chris Ellis, Nicholas Galitzki, Neil Goeckner-Wald, Kathleen Harrington, Erin Healy, Charles A. Hill, Shuay Pwu Patty HoJohannes Hubmayr, Brian Keating, Kenji Kiuchi, Akito Kusaka, Adrian T. Lee, Michael Ludlam, Aashrita Mangu, Frederick Matsuda, Heather McCarrick, Federico Nati, Michael D. Niemack, Haruki Nishino, John Orlowski-Scherer, Mayuri Sathyanarayana Rao, Christopher Raum, Yuki Sakurai, Maria Salatino, Trevor Sasse, Joseph Seibert, Carlos Sierra, Maximiliano Silva-Feaver, Jacob Spisak, Sara M. Simon, Suzanne Staggs, Osamu Tajima, Grant Teply, Tran Tsan, Edward Wollack, Bejamin Westbrook, Zhilei Xu, Mario Zannoni, Ningfeng Zhu

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


The Simons Observatory (SO) is an upcoming cosmic microwave background (CMB) experiment located on Cerro Toco, Chile, that will map the microwave sky in temperature and polarization in six frequency bands spanning 27 to 285 GHz. SO will consist of one 6-m large aperture telescope fielding ∼ 30,000 detectors and an array of three 0.42-m small aperture telescopes (SATs) fielding an additional 30,000 detectors. This synergy will allow for the extremely sensitive characterization of the CMB over angular scales ranging from an arcmin to tens of degrees, enabling a wide range of scientific output. Here we focus on the SATs targeting degree angular scales with successive dichroic instruments observing at mid-frequency (MF: 93/145 GHz), ultra-high-frequency (UHF: 225/285 GHz), and low-frequency (LF: 27/39 GHz). The three SATs will be able to map ∼ 10% of the sky to a noise level of ∼ 2μK-arcmin when combining 93 and 145 GHz. The multiple frequency bands will allow the CMB to be separated from galactic foregrounds (primarily synchrotron and dust), with the primary science goal of characterizing the primordial tensor-to-scalar ratio, r, at a target level of σ(r) ≈ 0.003.

Original languageEnglish (US)
Pages (from-to)461-471
Number of pages11
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - Sep 1 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


  • CMB
  • Cosmic microwave background
  • Cosmology
  • Inflation
  • Refractor
  • Simons Observatory
  • Small aperture telescope
  • TES


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