This validation study finds that a transfer-function power spectrum estimator recovers unbiased cosmological parameters, including the tensor-to-scalar ratio r, in simulations of the first year of Simons Observatory small-aperture telescope data.
Characterizing Atacama B-mode Search Detectors with a Half-Wave Plate
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abstract
The Atacama B-Mode Search (ABS) instrument is a cryogenic ($\sim$10 K) crossed-Dragone telescope located at an elevation of 5190 m in the Atacama Desert in Chile that observed for three seasons between February 2012 and October 2014. ABS observed the Cosmic Microwave Background (CMB) at large angular scales ($40<\ell<500$) to limit the B-mode polarization spectrum around the primordial B-mode peak from inflationary gravity waves at $\ell \sim100$. The ABS focal plane consists of 480 transition-edge sensor (TES) bolometers. They are coupled to orthogonal polarizations from a planar ortho-mode transducer (OMT) and observe at 145 GHz. ABS employs an ambient-temperature, rapidly rotating half-wave plate (HWP) to mitigate systematic effects and move the signal band away from atmospheric $1/f$ noise, allowing for the recovery of large angular scales. We discuss how the signal at the second harmonic of the HWP rotation frequency can be used for data selection and for monitoring the detector responsivities.
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The Simons Observatory: Validation of reconstructed power spectra from simulated filtered maps for the Small Aperture Telescope survey
This validation study finds that a transfer-function power spectrum estimator recovers unbiased cosmological parameters, including the tensor-to-scalar ratio r, in simulations of the first year of Simons Observatory small-aperture telescope data.