Modern Skipper CCD technology has been used in particle physics experiments since its first successful demonstration in 2017. This technology has been demonstrated to achieve extremely low readout noise (0.039 e-rms/pix), while maintaining the benefits of conventional CCD detectors. The extremely low noise of Skipper CCDs presents a very interesting potential for certain astronomical applications where photon shot noise does not dominate, and the ability of Skipper CCDs to be tuned for a desired readout noise allows for a wide range of applications. In the current paper, we focus on the engineering work performed in cryo-mechanics and electronics (Dewar, detector mount, preamplifier, etc.) at NOIRLab-CTIO in order to perform on-sky testing of a mosaic of 4 Skipper CCDs using the SOAR Integral Field Spectrograph (SIFS). This work was performed in the context of a NOIRLab/LNA/Fermilab/U.Chicago/LBNL collaboration for testing Skipper devices for astronomy. We also present the mosaic characterization results of the detectors from the laboratory, as well as the final engineering performance results from on sky observations.
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