Wavefront sensing and control performance modeling of the Thirty Meter telescope for systematic trade analyses

Carl Nissly; Byoung-Joon Seo; Mitchell Troy; Gary Chanan; Scott Roberts; John Rogers

doi:10.1117/12.2057157

4 August 2014 Wavefront sensing and control performance modeling of the Thirty Meter telescope for systematic trade analyses

Carl Nissly, Byoung-Joon Seo, Mitchell Troy, Gary Chanan, Scott Roberts, John Rogers

Author Affiliations +

Proceedings Volume 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI; 91500S (2014) https://doi.org/10.1117/12.2057157
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

We have developed an integrated optical model of the semi-static performance of the Thirty Meter Telescope. The model includes surface and rigid body errors of all telescope optics as well as a model of the Alignment and Phasing System Shack-Hartmann wavefront sensors and control algorithms. This integrated model allows for simulation of the correction of the telescope wavefront, including optical errors on the secondary and tertiary mirrors, using the primary mirror segment active degrees of freedom. This model provides the estimate of the predicted telescope performance for system engineering and error budget development. In this paper we present updated performance values for the TMT static optical errors in terms of Normalized Point Source Sensitivity and RMS wavefront error after Adaptive Optics correction. As an example of a system level trade, we present the results from an analysis optimizing the number of Shack-Hartmann lenslets per segment. We trade the number of lenslet rings over each primary mirror segment against the telescope performance metrics of PSSN and RMS wavefront error.

Citation Download Citation

Carl Nissly, Byoung-Joon Seo, Mitchell Troy, Gary Chanan, Scott Roberts, and John Rogers "Wavefront sensing and control performance modeling of the Thirty Meter telescope for systematic trade analyses", Proc. SPIE 9150, Modeling, Systems Engineering, and Project Management for Astronomy VI, 91500S (4 August 2014); https://doi.org/10.1117/12.2057157

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