UC San Diego

Measurements of the faint polarization signal from the cosmic microwave background (CMB) have become increasingly more sensitive largely due to the ability to package and read out large arrays of cryogenic detectors. The Simons Observatory, pushes this trend further by deploying a multiplexed readout technology called the microwave squid multiplexer capable of reading out 1000 pixels on a single readout line; this has never previously been demonstrated. In this dissertation I overview the physics of cosmic microwave background, present the design and science reach of the Simons Observatory telescopes, present the design and integration of the multiplexer into the Simons Observatory telescopes, and present a predictive noise model for general multiplexer design. Lastly, I also outline the initial in field instrument commissioning data and pipeline work.