19 July 2016 CryoPAF4: a cryogenic phased array feed design
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Abstract
Phased array feed (PAF) receivers used on radio astronomy telescopes offer the promise of increased fields of view while maintaining the superlative performance attained with traditional single pixel feeds (SPFs). However, the much higher noise temperatures of room temperature PAFs compared to cryogenically-cooled SPFs have prevented their general adoption. Here we describe a conceptual design for a cryogenically cooled 2.8 – 5.18 GHz dual linear polarization PAF with estimated receiver temperature of 11 K. The cryogenic PAF receiver will comprise a 140 element Vivaldi antenna array and low-noise amplifiers housed in a 480 mm diameter cylindrical dewar covered with a RF transparent radome. A broadband two-section coaxial feed is integrated within each metal antenna element to withstand the cryogenic environment and to provide a 50 ohm impedance for connection to the rest of the receiver. The planned digital beamformer performs digitization, frequency band selection, beam forming and array covariance matrix calibration. Coupling to a 15 m offset Gregorian dual-reflector telescope, cryoPAF4 can expect to form 18 overlapping beams increasing the field of view by a factor of ~8x compared to a single pixel receiver of equal system temperature.
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Lisa Locke, Lisa Locke, Dominic Garcia, Dominic Garcia, Mark Halman, Mark Halman, Doug Henke, Doug Henke, Gary Hovey, Gary Hovey, Nianhua Jiang, Nianhua Jiang, Lewis Knee, Lewis Knee, Gordon Lacy, Gordon Lacy, David Loop, David Loop, Michael Rupen, Michael Rupen, Bruce Veidt, Bruce Veidt, Ramunas Wierzbicki, Ramunas Wierzbicki, } "CryoPAF4: a cryogenic phased array feed design", Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99141P (19 July 2016); doi: 10.1117/12.2232190; https://doi.org/10.1117/12.2232190
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