Cryogenic HWP modulators for Simons Observatory SATs achieve required rotation accuracy in >99.9% of observations with median noise 0.16 μrad√s and rotor displacement accuracy 0.06 μm√s.
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The Simons Observatory: Rotation Performance of Cryogenic Half-Wave Plate Polarization Modulators
Cryogenic HWP modulators for Simons Observatory SATs achieve required rotation accuracy in >99.9% of observations with median noise 0.16 μrad√s and rotor displacement accuracy 0.06 μm√s.