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Kevin Crowley (UCB) “The View From Down Here: Ground-Based Measurements of the Cosmic Microwave Background from the Atacama Desert”
March 10, 2022 @ 4:00 pm - 5:00 pm
The study of the Cosmic Microwave Background (CMB) anisotropies has become a percent-level science constraining the accepted cosmological model ΛCDM. The most powerful measurements thus far have been made from space, but observations from the Earth’s surface can be made at higher resolution, with higher detector count, and with iterative upgrades to the instruments. One key goal of recent upgrades has been recovering the large angular-scale polarization signal that could reveal the signature of inflation in the early universe. The current generation of ground-based telescopes have developed new technologies, including polarization-modulator systems, kilopixel focal plane arrays, and highly-multiplexed detector readout, all with the goal of enabling sensitivity while controlling systematic errors in the challenging environment of polarization measurements under the atmosphere. In this talk, I will describe my efforts in these areas of instrumentation development and my experiences pushing for sensitivity while pondering just what lies below the noise in CMB experiments observing from the Atacama Desert. I will also highlight the ways that future experiments, including the under-construction Simons Observatory and the exciting prospect of CMB-S4, will lay a path toward the ultimate goal of fully exploring the physics in the CMB from terra firma.
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