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Proceedings Paper

Investigation of Thirty Meter Telescope wavefront maintenance using low-order Shack-Hartmann wavefront sensors to correct for thermally-induced misalignments
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Paper Abstract

We evaluate how well the performance of the Thirty Meter Telescope (TMT) can be maintained against thermally induced errors during a night of observation. We first demonstrate that using look-up-table style correction for TMT thermal errors is unlikely to meet the required optical performance specifications. Therefore, we primarily investigate the use of a Shack-Hartmann Wavefront Sensor (SH WFS) to sense and correct the low spatial frequency errors induced by the dynamic thermal environment. Given a basic SH WFS design, we position single or multiple sensors within the telescope field of view and assess telescope performance using the JPL optical ray tracing tool MACOS for wavefront simulation. Performance for each error source, wavefront sensing configuration, and control scheme is evaluated using wavefront error, plate scale, pupil motion, pointing error, and the Point Source Sensitivity (PSSN) as metrics. This study provides insight into optimizing the active optics control methodology for TMT in conjunction with the Alignment and Phasing System (APS) and primary mirror control system (M1CS).

Paper Details

Date Published: 4 August 2010
PDF: 9 pages
Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77380H (4 August 2010); doi: 10.1117/12.857849
Show Author Affiliations
Carl Nissly, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Mitchell Troy, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
George Angeli, Thirty Meter Telescope (United States)
Myung Cho, Thirty Meter Telescope (United States)
Chris Shelton, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Norbert Sigrist, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Mark Sirota, Thirty Meter Telescope (United States)


Published in SPIE Proceedings Vol. 7738:
Modeling, Systems Engineering, and Project Management for Astronomy IV
George Z. Angeli; Philippe Dierickx, Editor(s)

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