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Large Millimeter Bolometric Arrays for Cosmic Microwave Background Observations

Special Seminar

Title:  Large Millimeter Bolometric Arrays for Cosmic Microwave Background Observations


Shuay-Pwu Patty Ho (Princeton University)


2pm-3pm, Thursday, August 3 at General Building II R521, IoA


The cosmic microwave background (CMB) continues to reveal new aspects of the large scale universe. For example, current projects are searching for evidence of primordial gravitational waves, for signatures sensitive to the sum of the neutrino masses, and for further understanding of the formation and growth of large structures under the influence of gravity in the accelerating universe. Technologies for ground-based and balloon-borne instruments measuring the polarization of the CMB have been well established and advanced in the last decade.

Two upgraded bolometric polarimeters on the Atacama Cosmology Telescope (ACT), the ACT Polarimeter (ACTPol) and the Advanced ACTPol, have made and will make sensitive measurements of the temperature and polarization in the Cosmic Microwave Background (CMB) with arcminute resolution.  In this talk, I will focus on the instrumentation of these state-of-the-art arrays, especially the Advanced ACTPol ones. I will conclude with the results coming from the two-season cosmological results presented in Louis et al. (2016) and describe the current progress on the all three ACTPol seasons.