Kavli Affiliate: Tomotake Matsumura
| First 5 Authors: Junna Sugiyama, Tomoki Terasaki, Kana Sakaguri, Bryce Bixler, Yuki Sakurai
| Summary:
The 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.
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