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Design and Performance of the SOAR Primary Mirror Calibration Wavefront Sensor

Adaptive Optics Associates has designed and built the Southern Astrophysical Research (SOAR) telescope primary mirror calibration wavefront sensor. It will be used to monitor the figure of the active primary mirror during observations. The package also includes an acquisition camera subsystem. The sensor uses many commercial components to control cost while meeting the desired technical specifications. We describe the wavefront sensor system and present results of performance testing obtained in the laboratory.