Simons Observatory Small Aperture Telescope overview
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 silicon lenses. Cryogenic ring baffles with engineered blackbody absorbers are installed in the optics tube to minimize the stray light. The entire optics tube is cooled to 1 K. A cryogenic continuously rotating half-wave plate near the sky side of the aperture stop helps to minimize the effect of atmospheric uctuations. The telescope warm baffling consists of a forebaffle, an elevation stage mounted co-moving shield, and a fixed ground shield that together control the far side-lobes and mitigates ground-synchronous systematics. We present the status of the SAT development.
Keywords
Cite
@article{arxiv.2101.11917,
title = {Simons Observatory Small Aperture Telescope overview},
author = {Kenji Kiuchi and Shunsuke Adachi and Aamir M. Ali and Kam Arnold and Peter Ashton and Jason E. Austermann and Andrew Bazako and James A. Beall and Yuji Chinone and Gabriele Coppi and Kevin D. Crowley and Kevin T. Crowley and Simon Dicker and Bradley Dober and Shannon M. Duff and Giulio Fabbian and Nicholas Galitzki and Joseph E. Golec and Jon E. Gudmundsson and Kathleen Harrington and Masaya Hasegawa and Makoto Hattori and Charles A. Hill and Shuay-Pwu Patty Ho and Johannes Hubmayr and Bradley R. Johnson and Daisuke Kaneko and Nobuhiko Katayama and Brian Keating and Akito Kusaka and Jack Lashner and Adrian T. Lee and Frederick Matsuda and Heather McCarrick and Masaaki Murata and Federico Nati and Yume Nishinomiya and Lyman Page and Mayuri Sathyanarayana Rao and Christian L. Reichardt and Kana Sakaguri and Yuki Sakurai and Joseph Seibert and Jacob Spisak and Osamu Tajima and Grant P. Teply and Tomoki Terasaki and Tran Tsan and Samantha Walker and Edward J. Wollack and Zhilei Xu and Kyohei Yamada and Mario Zannoni and Ningfeng Zhu},
journal= {arXiv preprint arXiv:2101.11917},
year = {2021}
}
Comments
8 pages, 6 figures