Millimeter-Wave Profiled Corrugated Horns for the Quad Cosmic Background Polarization Experiment |
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Authors: | J A Murphy E Gleeson G Cahill W Lanigan C OSullivan E Cartwright S E Church J Hinderks E Kirby K Thompson B Rusholme W K Gear B Maffei P A R Ade C Tucker and B Jones |
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Institution: | (1) National University of Ireland, Maynooth, Co. Kildare, Ireland;(2) Stanford University, Stanford, CA 94305-4060, USA;(3) Cardiff University, Cardiff, CF24 3YB, UK;(4) California Institute of Technology, Pasadena, CA 91125, USA |
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Abstract: | In this paper we report on the design and validation process for the profiled corrugated horn antennas, which feed the bolometer array of a cosmology experiment known as QUaD located at the South Pole. This is a cosmic background radiation polarization project, which demands precise knowledge and control of the optical coupling to the signal in order to map the feeble E- and B-polarization mode structure. The system will operate in two millimeter wavelength bands at 100 and 150 GHz. The imaging horn array collects the incoming signal via on-axis front-end optics and a Cassegrain telescope, with a cold stop in front of the array to terminate side-lobe structure at an edge taper of –20dB. The corrugated horn design process was undertaken using in-house analytical software tools, based on modal scattering, specially developed for millimeter -wave profiled horn antennas. An important part of the instrument development was the validation of the horn design, in particular to verify low edge taper levels and the required well-defined band edges. Suitable feed horn designs were measured and were found to be in excellent agreement with theoretical predictions. |
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Keywords: | profiled corrugated horn antennas polarization CMB |
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