Simons Observatory Small Aperture Telescope overview
Kenji Kiuchi, Shunsuke Adachi, Aamir M. Ali, Kam Arnold, Peter Ashton,, Jason E. Austermann, Andrew Bazako, James A. Beall, Yuji Chinone, Gabriele, Coppi, Kevin D. Crowley, Kevin T. Crowley, Simon Dicker, Bradley Dober,, Shannon M. Duff, Giulio Fabbian, Nicholas Galitzki

TL;DR
The paper provides an overview of the Simons Observatory's small-aperture telescopes designed for detecting primordial gravitational waves through CMB polarization, detailing their design, components, and current development status.
Contribution
It introduces the design and technical specifications of the SO SATs, highlighting innovations in optics, cryogenics, and systematic mitigation techniques.
Findings
SATs are optimized for B-mode polarization detection.
The optics system uses metamaterial anti-reflection coated silicon lenses.
Development status of the SATs is presented.
Abstract
The Simons Observatory (SO) is a cosmic microwave background (CMB) experiment from the Atacama Desert in Chile comprising three small-aperture telescopes (SATs) and one large-aperture telescope (LAT). In total, SO will field over 60,000 transition-edge sensor (TES) bolometers in six spectral bands centered between 27 and 280 GHz in order to achieve the sensitivity necessary to measure or constrain numerous cosmological quantities. In this work, we focus on the SATs which are optimized to search for primordial gravitational waves that are detected as parity-odd polarization patterns called a B-modes on degree scales in the CMB. Each SAT employs a single optics tube with TES arrays operating at 100 mK. The high throughput optics system has a 42 cm aperture and a 35-degree field of view coupled to a 36 cm diameter focal plane. The optics consist of three metamaterial anti-re ection coated…
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