Full-sky beam convolution for cosmic microwave background applications

Abstract

We introduce a publicly available full-sky beam convolution code library intended to inform the design of future cosmic microwave background (CMB) instruments and help current experiments probe potential systematic effects. The code can be used to assess the impact of optical systematics on all stages of data reduction for a realistic experiment, including analyses beyond power spectrum estimation, by generating signal timelines that may serve as input to full analysis pipelines. The design and mathematical framework of the Python code is discussed along with a few simple benchmarking results. We present a simple two-lens refracting telescope design and use it together with the code to simulate a year-long dataset for 400 detectors scanning the sky on a satellite instrument. The simulation results identify a number of sub-leading optical non-idealities and demonstrate significant B-mode residuals caused by extended sidelobes that are sensitive to polarized radiation from the Galaxy. For the proposed design and satellite scanning strategy, we show that a full physical optics beam model generates B-mode systematics that differ significantly from the simpler elliptical Gaussian model. The code is available at https://github.com/adrijd/beamconv

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Cited by in corpus (12)

• CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
• The Simons Observatory: Modeling Optical Systematics in the Large Aperture Telescope
• The Atacama Cosmology Telescope: Measurement and Analysis of 1D Beams for DR4
• Probing frequency-dependent half-wave plate systematics for CMB experiments with full-sky beam convolution simulations
• Impact of half-wave plate systematics on the measurement of cosmic birefringence from CMB polarization
• PROTOCALC, A W-band polarized calibrator for CMB Telescopes: application to Simons Observatory and CLASS
• Geometrical and physical optics analysis for mm-wavelength refractor telescopes designed to map the cosmic microwave background
• Pixel space convolution for cosmic microwave background experiments
• Fast map-based simulations of systematics in CMB surveys including effects of the scanning strategy
• Modeling optical systematics for the Taurus CMB experiment
• The Simons Observatory: Quantifying the impact of beam chromaticity on large-scale B-mode science
• The Simons Observatory: laboratory beam characterization for the first small aperture telescope