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The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope

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arxiv 2009.10138 v1 pith:JMKJGLGM submitted 2020-09-21 astro-ph.IM

The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope

classification astro-ph.IM
keywords opticsdesignsimulationstelescopedescribeaperturebeamcold
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope; allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics which are now being built. We describe non-sequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far field beam patterns which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.

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