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The Simons Observatory: Rotation Performance of Cryogenic Half-wave Plate Polarization Modulators

  • Authors: Kyohei Yamada, Bryce Bixler, Junna Sugiyama, Daichi Sasaki, Yuki Sakurai, Kam Arnold, Samuel Day-Weiss, Nicholas Galitzki, Bradley R. Johnson, Akito Kusaka, Lyman A. Page, Yoshinori Sueno, Satoru Takakura

Kyohei Yamada et al 2026 The Astrophysical Journal Supplement Series 286 .

  • Provider: AAS Journals

Caption: Figure 9.

The measured polarization angle of the fixed sparse wire grid calibrator as a function of telescope elevation with and without correction of ϕi. The solid black line shows the expected shift of polarization angle due to ϕi. Without correction, the measured polarization angle rotates depending on elevation. The measured polarization angle after correction is almost constant with elevation. This measurement was conducted with SAT3.

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