A simulator for ground-based millimeter- and submillimeter-wave telescopes.
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maria blows the stars around / and sends the clouds a-flyin’
maria is a complete simulator of ground-based millimeter- and submillimeter-wave telescopes. Tutorials for installation and usage can be found in the documentation.
Background
Atmospheric modeling is an important step in both experiment design and subsequent data analysis for ground-based cosmological telescopes observing the cosmic microwave background (CMB). The next generation of ground-based CMB experiments will be marked by a huge increase in data acquisition: telescopes like AtLAST and CMB-S4 will consist of hundreds of thousands of superconducting polarization-sensitive bolometers sampling the sky. This necessitates new methods of efficiently modeling and simulating atmospheric emission at small angular resolutions, with algorithms than can keep up with the high throughput of modern telescopes.
maria simulates layers of turbulent atmospheric emission according to a statistical model derived from observations of the atmosphere in the Atacama Desert, from the Atacama Cosmology Telescope (ACT) and the Atacama B-Mode Search (ABS). It uses a sparse-precision auto-regressive Gaussian process algorithm that allows for both fast simulation of high-resolution atmosphere, as well as the ability to simulate arbitrarily long periods of atmospheric evolution.
Methodology
maria auto-regressively simulates an multi-layeed two-dimensional “integrated” atmospheric model that is much cheaper to compute than a three-dimensional model, which can effectively describe time-evolving atmospheric emission. maria can thus effectively simulate correlated atmospheric emission for in excess of 100,000 detectors observing the sky concurrently, at resolutions as fine as one arcminute. The atmospheric model used is detailed here.
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