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Proceedings Paper

Aberration Correction In A Telescope With A Segmented Primary
Author(s): Jerry Nelson; Terry Mast; Gary Chanan
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Paper Abstract

In a Cassegrain telescope with a segmented primary mirror, wavefront aberrations are introduced by segment figure errors, segment positioning errors, secondary figure errors, and secondary positioning errors. We give here an analytic description of these errors. The various sources contribute different aberrations to the wavefront. These differences suggest an ordering to the aberration measurement and correction, and allow options in alignment procedures and tolerances. The segmentation and control of the primary mirror segments allow the partial correction of figure aberrations in the secondary mirror and aberrations caused by secondary misalignment. We use the W. M. Keck Ten Meter Telescope as an example for these considerations. The ten-meter diameter actively-controlled primary mirror is a mosaic of thirty-six hexagonal segments and is currently under construction.

Paper Details

Date Published: 20 September 1989
PDF: 17 pages
Proc. SPIE 1114, Active Telescope Systems, (20 September 1989); doi: 10.1117/12.960830
Show Author Affiliations
Jerry Nelson, University of California (United States)
Terry Mast, University of California (United States)
Gary Chanan, University of California (United States)

Published in SPIE Proceedings Vol. 1114:
Active Telescope Systems
Francois J. Roddier, Editor(s)

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