Maintaining the co-phasing of the primary mirror segments is a critical aspect to the operation of segmented telescopes. However, speckle-based measurements of the phasing of the Keck primary estimated static aberrations of approximately 90 nm rms that are not sensed by the current edge-sensing segment control system. We propose directly sensing and controlling the primary via the wavefront sensor of the adaptive optics system, as a Controllable Segmented Primary (CSP), to actively correct its phasing. In this work, we consider strategies for implementing and calibrating the CSP system on-sky.
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