19 July 2016 The design and characterization of wideband spline-profiled feedhorns for Advanced ACTPol
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Advanced ACTPol (AdvACT) is an upgraded camera for the Atacama Cosmology Telescope (ACT) that will measure the cosmic microwave background in temperature and polarization over a wide range of angular scales and five frequency bands from 28-230 GHz. AdvACT will employ four arrays of feedhorn-coupled, polarization- sensitive multichroic detectors. To accommodate the higher pixel packing densities necessary to achieve Ad- vACT’s sensitivity goals, we have developed and optimized wideband spline-profiled feedhorns for the AdvACT multichroic arrays that maximize coupling efficiency while carefully controlling polarization systematics. We present the design, fabrication, and testing of wideband spline-profiled feedhorns for the multichroic arrays of AdvACT.
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Sara M. Simon, Sara M. Simon, Jason Austermann, Jason Austermann, James A. Beall, James A. Beall, Steve K Choi, Steve K Choi, Kevin P. Coughlin, Kevin P. Coughlin, Shannon M. Duff, Shannon M. Duff, Patricio A. Gallardo, Patricio A. Gallardo, Shawn W. Henderson, Shawn W. Henderson, Felicity B. Hills, Felicity B. Hills, Shuay-Pwu Patty Ho, Shuay-Pwu Patty Ho, Johannes Hubmayr, Johannes Hubmayr, Alec Josaitis, Alec Josaitis, Brian J. Koopman, Brian J. Koopman, Jeff J. McMahon, Jeff J. McMahon, Federico Nati, Federico Nati, Laura Newburgh, Laura Newburgh, Michael D. Niemack, Michael D. Niemack, Maria Salatino, Maria Salatino, Alessandro Schillaci, Alessandro Schillaci, Benjamin L. Schmitt, Benjamin L. Schmitt, Suzanne T. Staggs, Suzanne T. Staggs, Eve M. Vavagiakis, Eve M. Vavagiakis, Jonathan Ward, Jonathan Ward, Edward J. Wollack, Edward J. Wollack, } "The design and characterization of wideband spline-profiled feedhorns for Advanced ACTPol", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 991416 (19 July 2016); doi: 10.1117/12.2233603; https://doi.org/10.1117/12.2233603

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