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Control of the California Extremely Large Telescope primary mirror

MacMartin, Douglas G. and Chanan, Gary (2003) Control of the California Extremely Large Telescope primary mirror. In: Future Giant Telescopes. Proceedings of SPIE. No.4840. Society of Photo-optical Instrumentation Engineers , Bellingham, WA, pp. 69-80. ISBN 9780819446190.

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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.

Item Type:Book Section
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URLURL TypeDescription
MacMartin, Douglas G.0000-0003-1987-9417
Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers.
Group:Thirty Meter Telescope
Subject Keywords:Extremely Large Telescopes, CELT, Segmented Mirror Control
Series Name:Proceedings of SPIE
Issue or Number:4840
Record Number:CaltechAUTHORS:20180925-161108492
Persistent URL:
Official Citation:Douglas G. MacMartin, Douglas G. MacMartin, Gary A. Chanan, Gary A. Chanan, } "Control of the California Extremely Large Telescope primary mirror", Proc. SPIE 4840, Future Giant Telescopes, (30 January 2003); doi: 10.1117/12.458150;
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89938
Deposited By: Tony Diaz
Deposited On:25 Sep 2018 23:17
Last Modified:16 Nov 2021 00:39

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