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Proceedings Paper

Control of the California Extremely Large Telescope primary mirror
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Paper Abstract

The current design concept for the California Extremely Large Telescope (CELT) includes 1080 segments in the primary mirror, with the out-of-plane degrees of freedom actively controlled. We construct the control matrix for this active control system, and describe its singular modes and sensor noise propagation. Data from the Keck telescopes are used to generate realistic estimates of the control system contributions to the CELT wavefront error and wavefront gradient error. Based on these estimates, control system noise will not significantly degrade either seeing-limited or diffraction-limited observations. The use of supplemental wavefront information for real-time control is therefore not necessary. We also comment briefly on control system bandwidth requirements and limitations.

Paper Details

Date Published: 30 January 2003
PDF: 12 pages
Proc. SPIE 4840, Future Giant Telescopes, (30 January 2003); doi: 10.1117/12.458150
Show Author Affiliations
Douglas G. MacMartin, California Institute of Technology (United States)
Gary A. Chanan, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 4840:
Future Giant Telescopes
J. Roger P. Angel; Roberto Gilmozzi, Editor(s)

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