Padin, Stephen (2004) Location of the elevation axis in a large optical telescope. Applied Optics, 43 (5). pp. 1097-1107. ISSN 0003-6935. https://resolver.caltech.edu/CaltechAUTHORS:PADao04a
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Abstract
Proposed designs for the next generation of large optical telescopes favor a tripod or quadrupod secondary support, and a primary supported from the back, but it is not yet clear whether the elevation axis should be in front of the primary or behind it. A study is described of the effect of elevation-axis location on key performance parameters (fundamental frequency, blockage, and wind-induced secondary decenter) for a 30-m Cassegrain telescope with a mount configuration that is typical of the new designs. For a fast (e.g., f/1) primary, the best location for the elevation axis is behind the primary. The penalty for moving the elevation axis in front of the primary is roughly a 40% decrease in fundamental frequency and a corresponding reduction in the control bandwidth for pointing and optical alignment.
Item Type: | Article | ||||||
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Additional Information: | © 2004 Optical Society of America Received 8 May 2003; revised manuscript received 20 October 2003; accepted 22 October 2003. The author thanks Doug MacMartin and Larry Stepp for helpful comments. This study was supported by the Caltech Discovery Fund. | ||||||
Issue or Number: | 5 | ||||||
Record Number: | CaltechAUTHORS:PADao04a | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:PADao04a | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 5662 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | Archive Administrator | ||||||
Deposited On: | 27 Oct 2006 | ||||||
Last Modified: | 02 Oct 2019 23:25 |
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