Design and performance of a cryogenic half-wave plate rotator for the Simons Observatory small aperture telescopes

Peter C. Ashton

doi:10.1117/12.2563120

13 December 2020 Design and performance of a cryogenic half-wave plate rotator for the Simons Observatory small aperture telescopes

Peter C. Ashton

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114534N (2020) https://doi.org/10.1117/12.2563120
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes (SATs) and one large-aperture telescope, which will observe from the Atacama Desert in Chile. To control for systematics in the polarization signal, the SAT design will use a continuously rotating cryogenic half wave plate (HWP) on a high-temperature superconductor magnetic levitation bearing. This is the largest such cryogenic rotation mechanism to be deployed on a telescope to date. We will discuss the design and the mechanical and thermal performance of the SAT HWP rotator.

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Peter C. Ashton "Design and performance of a cryogenic half-wave plate rotator for the Simons Observatory small aperture telescopes", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114534N (13 December 2020); https://doi.org/10.1117/12.2563120

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