19 July 2016CryoPAF4: a cryogenic phased array feed design
Lisa Locke, Dominic Garcia, Mark Halman, Doug Henke, Gary Hovey, Nianhua Jiang, Lewis Knee, Gordon Lacy, David Loop, Michael Rupen, Bruce Veidt, Ramunas Wierzbicki
Lisa Locke,1 Dominic Garcia,1 Mark Halman,1 Doug Henke,1 Gary Hovey,1 Nianhua Jiang,1 Lewis Knee,1 Gordon Lacy,1 David Loop,1 Michael Rupen,1 Bruce Veidt,1 Ramunas Wierzbicki1
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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, Dominic Garcia, Mark Halman, Doug Henke, Gary Hovey, Nianhua Jiang, Lewis Knee, Gordon Lacy, David Loop, Michael Rupen, Bruce Veidt, 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); https://doi.org/10.1117/12.2232190