The Simons Observatory: Beam characterization for the Small Aperture Telescopes
arxiv(2023)
摘要
We use time-domain simulations of Jupiter observations to test and develop a
beam reconstruction pipeline for the Simons Observatory Small Aperture
Telescopes. The method relies on a map maker that estimates and subtracts
correlated atmospheric noise and a beam fitting code designed to compensate for
the bias caused by the map maker. We test our reconstruction performance for
four different frequency bands against various algorithmic parameters,
atmospheric conditions and input beams. We additionally show the reconstruction
quality as function of the number of available observations and investigate how
different calibration strategies affect the beam uncertainty. For all of the
cases considered, we find good agreement between the fitted results and the
input beam model within a 1.5
0.5
harmonic-domain component separation algorithm to verify that the beam
reconstruction errors and biases observed in our analysis do not significantly
bias the Simons Observatory r-measurement.
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