Horn Coupled Multichroic Polarimeters for the Atacama Cosmology Telescope Polarization Experiment

• DOI: 10.1007/s10909-014-1134-4
• Publication Date: 2014-02-21T16:38:18Z
• Authors: R. Datta; J. Hubmayr; C. Munson; J. Austermann; J. Beall; D. Becker; H. M. Cho; N. Halverson; G. Hilton; K. Irwin; D. Li; J. McMahon; L. Newburgh; J. Nibarger; M. Niemack; B. Schmitt; H. Smith; S. Staggs; J. Van Lanen; E. Wollack
• Keywords: 0103 physical sciences; FOS: Physical sciences; Astrophysics - Instrumentation and Methods for Astrophysics; Instrumentation and Methods for Astrophysics (astro-ph.IM); 01 natural sciences

Multichroic polarization sensitive detectors enable increased sensitivity and spectral coverage for observations of the Cosmic Microwave Background (CMB). An array optimized for dual frequency detectors can provide 1.7 times gain in sensitivity compared to a single frequency array. We present the design and measurements of horn coupled multichroic polarimeters encompassing the 90 and 150 GHz frequency bands and discuss our plans to field an array of these detectors as part of the ACTPol project.