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DTSTART;TZID=America/Los_Angeles:20170119T160000
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DTSTAMP:20260423T135329
CREATED:20160922T155941Z
LAST-MODIFIED:20160922T155941Z
UID:329-1484841600-1484845200@rpm.physics.lbl.gov
SUMMARY:Kirit Karkare (Harvard) "B-Mode Polarization Results from BICEP/Keck Array and Beam Systematics in Current and Next-Generation CMB Experiments"
DESCRIPTION:Abstract:\nThe BICEP/Keck Array cosmic microwave background (CMB) polarization experiments located at the South Pole are a series of small-aperture refracting telescopes focused on the degree-scale B-mode signature of inflationary gravitational waves.  I will present our latest results which have produced the most stringent constraints on the tensor-to-scalar ratio to date: sigma(r) = 0.024 and r < 0.09 from B-modes alone (r < 0.07 in combination with other datasets).  These constraints will rapidly improve with upcoming measurements at the multiple frequencies needed to separate Galactic foregrounds from the CMB\, and in combination with higher-resolution experiments to remove B-modes induced by gravitational lensing.  I will provide an update on our expanded frequency coverage and plans for future receivers.\nNext-generation CMB experiments with hundreds of thousands of detectors will require exquisite control of instrumental systematics.  I will review key aspects of the BICEP/Keck instrument design which maximize polarization sensitivity and reduce systematics at large angular scales\, including the ability to measure beams in the far field with high precision.  Finally\, I will discuss the prospects for dealing with temperature-to-polarization leakage in future experiments\, and how the beams systematics levels we achieve with current instrument and analysis technology will scale with detector count.
URL:https://rpm.physics.lbl.gov/event/reserved-27/
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