The axial actuators for the VST primary mirror

Date Issued
2010
Author(s)
•
Sergio D'Orsi
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•
•
•
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Capaccioli, Massimo
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Tomelleri, Raffaele
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Rossettini, Pierfrancesco
•
DOI
10.1117/12.856610
Abstract
The VST primary mirror is a 2.6-m meniscus made of Astro-Sitall. An active optics system is implemented to correct surface errors due to manufacturing or induced by gravity and temperature changes. The primary mirror is axially supported by 84 supports disposed in four concentric rings. Three of the supports, symmetrically placed and much stiffer than the other ones, define the axial plane of the primary mirror acting as fixed points. The remaining 81 supports are force controlled actuators, used to change the shape of the mirror according to wavefront measurements in closed loop operation, or to a look-up table in open loop. This paper describes the solutions adopted for the axial actuator, as well as the test campaign to assess their performance and degree of reliability.
Coverage
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
All editors
Atad-Ettedgui, Eli; Lemke, Dietrich
Series
Start page
773933--
Conferenece
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Conferenece place
San Diego, California, United States
Conferenece date
27 June - 2 July, 2010
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