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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