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26 August 2022 ALPACA: a fully cryogenic L-band phased array feed for radio astronomy
Amit Vishwas, Stephen C. Parshley, George E. Gull, German Cortes-Medellin, Kayla M. Rossi, Terry L. Herter, Donald B. Campbell, Mitchell C. Burnett, Spencer M. Ammermon, Nathaniel Ashcraft, Erich Nygaard, Karl F. Warnick, Brian D. Jeffs, Hamdi Mani, Christopher E. Groppi, Phil Perillat
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Proceedings Volume PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; PC121900G (2022) https://doi.org/10.1117/12.2629422
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
The Advanced L-band Phased Array Camera for Astronomy (ALPACA) will be a fully cryogenic phased array feed instrument operating from 1.3-1.7 GHz, providing an unmatched combination of sensitivity, wide bandwidth, and large instantaneous field of view. The instrument was originally targeted for installation at the Arecibo Radio Telescope but the tragic loss of the Gregorian platform in 2020 has led to a proposal to deploy ALPACA at the prime focus of the Green Bank Telescope. Here, we will report on the design and implementation of the antenna array, cryogenic vacuum vessel, signal transport and the digital back end.
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Amit Vishwas, Stephen C. Parshley, George E. Gull, German Cortes-Medellin, Kayla M. Rossi, Terry L. Herter, Donald B. Campbell, Mitchell C. Burnett, Spencer M. Ammermon, Nathaniel Ashcraft, Erich Nygaard, Karl F. Warnick, Brian D. Jeffs, Hamdi Mani, Christopher E. Groppi, and Phil Perillat "ALPACA: a fully cryogenic L-band phased array feed for radio astronomy", Proc. SPIE PC12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, PC121900G (26 August 2022); https://doi.org/10.1117/12.2629422
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KEYWORDS
Phased arrays
Cryogenics
L band
Radio astronomy
Data conversion
Pulsars
Radio telescopes
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