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Proceedings Paper

The axial actuators for the VST primary mirror
Author(s): D. Fierro; S. D'Orsi; L. Marty; C. Molfese; F. Perrotta; P. Schipani; M. Capaccioli; G. De Paris; R. Tomelleri; P. F. Rossettini; J. Farinato
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Paper 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.

Paper Details

Date Published: 22 July 2010
PDF: 19 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 773933 (22 July 2010); doi: 10.1117/12.856610
Show Author Affiliations
D. Fierro, INAF (Italy)
S. D'Orsi, Tomelleri s.r.l. (Italy)
L. Marty, Tomelleri s.r.l. (Italy)
C. Molfese, INAF, Osservatorio Astronomico di Capodimonte (Italy)
F. Perrotta, INAF, Osservatorio Astronomico di Capodimonte (Italy)
P. Schipani, INAF, Osservatorio Astronomico di Capodimonte (Italy)
M. Capaccioli, Tomelleri s.r.l. (Italy)
G. De Paris, INAF (Italy)
R. Tomelleri, Tomelleri s.r.l. (Italy)
P. F. Rossettini, Tomelleri s.r.l. (Italy)
J. Farinato, INAF, Osservatorio Astronomico di Padova (Italy)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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