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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4061
DTSTART:20160204T213000Z
DTEND:20160204T220000Z
DTSTAMP:20260414T225348Z
LAST-MODIFIED:20160203T135718Z
LOCATION:5280 Chamberlin Hall
SUMMARY:Design and Deployment of the first Multichroic Polarimeter arr
 ay on the Atacama Cosmology Telescope\, Special Cosmology Seminar\, Ra
 hul Datta\, University of Michigan
DESCRIPTION:The polarization of the Cosmic Microwave Background (CMB) 
 provides a unique window into the physics of inflation\, an alternativ
 e means to measure the neutrino mass sum\, and enables a multitude of 
 other astrophysical studies. Measurements of the inflationary B-mode s
 ignal requires instruments capable of mapping the CMB at multiple freq
 uency bands with unprecedented sensitivity and excellent control over 
 systematics. Feedhorn-coupled detectors with sensitivity to multiple s
 pectral bands within a single focal plane element offer an avenue to a
 chieve these goals. The Atacama Cosmology Telescope Polarimeter (ACTPo
 l) instrument is optimized to make arcminute resolution measurements o
 f CMB polarization\, CMB lensing\, and other secondary anisotropies. I
  will present the design of a feedhorn-coupled multichroic detector ar
 ray encompassing the 90 and 150 GHz frequency bands and the ancillary 
 technology needed to implement this array in the ACTPol experiment. Th
 is receiver\, deployed in January 2015\, represents the first multichr
 oic detector array deployed for a CMB experiment and is now the most s
 ensitive ACTPol array. I will also present the preliminary on-sky perf
 ormance of this array. I shall conclude with a brief discussion about 
 the ongoing work on the detection of polarized point sources in the AC
 TPol CMB maps and their impact on the estimation of the E-mode polariz
 ation power spectrum.
URL:https://www.physics.wisc.edu/events/?id=4061
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