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The Simons Observatory: Development and Optical Evaluation of Achromatic Half-Wave Plates

  • Published:2024-01-30 Issue:3-4 Volume:214 Page:173-181
  • ISSN:0022-2291
  • Container-title:Journal of Low Temperature Physics
  • language:en
  • Short-container-title:J Low Temp Phys

Author:

Sugiyama Junna,Terasaki Tomoki,Sakaguri Kana,Bixler Bryce,Sakurai Yuki,Arnold Kam,Crowley Kevin T.,Datta Rahul,Galitzki Nicholas,Hasegawa Masaya,Johnson Bradley R.,Keating Brian,Kusaka Akito,Lee Adrian,Matsumura Tomotake,Mcmahon Jeffrey,Silva-Feaver Maximiliano,Wang Yuhan,Yamada Kyohei

Abstract

AbstractThe Simons Observatory (SO) experiment is a cosmic microwave background (CMB) experiment located in the Atacama Desert, Chile. The SO’s small aperture telescopes (SATs) consist of three telescopes designed for precise CMB polarimetry at large angular scales. Each SAT uses a cryogenic rotating half-wave plate (HWP) as a polarization modulator to mitigate atmospheric 1/f noise and other systematics. To realize efficient polarization modulation over the observation bands, we fabricated an achromatic HWP (AHWP) consisting of three sapphire plates with anti-reflection coatings. The AHWP is designed to have broadband modulation efficiency and transmittance. This paper reports on the design and the preliminary characterization of the AHWPs for SATs.

Funder

JSR Fellowship

IGPEES

Japan Society for the Promotion of Science

FoPM

Simons Foundation

RECTOR

The University of Tokyo

Publisher

Springer Science and Business Media LLC

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