A conceptual design for the Thirty Meter Telescope alignment and phasing system
2008
The primary, secondary and tertiary mirrors of the Thirty Meter Telescope (TMT), taken together, have approximately
12,000 degrees of freedom in optical alignment. The Alignment and Phasing System (APS) will use
starlight and a variety of Shack-Hartmann based measurement techniques to position the segment pistons, tips,
and tilts, segment figures, secondary rigid body motion, secondary figure and the tertiary figure to correctly align
the TMT. We present a conceptual design of the APS including the requirements, alignment modes, predicted
performance, software architecture, and an optical design.
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