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Proceedings Paper

An integrated thermo-structural model to design a polarimeter for the GTC
Author(s): I. Di Varano; K. G. Strassmeier; M. Woche; U. Laux
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Paper Abstract

The GTC (Gran Telescopio Canarias), with an equivalent aperture of 10.4 m, effective focal length of 169.9 m, located at the Observatorio del Roque de los Muchachos , in La Palma, Canary Islands, will host on its Cassegrain focus the GRAPE polarimeter (GRAntecan PolarimEter). At such focus the plate scale is 1.21 arcsec/mm and the unvignetted FOV 8 arcmin. The instrument will provide full Stokes polarimetry in the spectral range 380-1500 nm, feeding simultaneously up to two spectrographs. At the moment an interface to HORS (High Optical Resolution Spectrograph) is being defined, located on the Nasmyth platform, it has a FWHM resolving power of about 25,000 (5 pixel) within a spectral range of 400-680 nm. The rotator and instrumental flanges for the Cassegrain focus are currently under definition. Hereafter I present the state of art of the mechanical design of the polarimeter, whose strategy is based on an integrated model of Zemax design into ANSYS FEM static and dynamic analyses with thermal loads applied, in order to retrieve tip-tilt, decentering errors and other significant parameters to be looped back to the Zemax model. In such a way it is possible to compare and refine the results achieved through the tolerance analysis.

Paper Details

Date Published: 5 July 2016
PDF: 11 pages
Proc. SPIE 10012, Integrated Modeling of Complex Optomechanical Systems II, 1001208 (5 July 2016); doi: 10.1117/12.2199910
Show Author Affiliations
I. Di Varano, Leibniz-Institut für Astrophysik Potsdam (Germany)
K. G. Strassmeier, Leibniz-Institut für Astrophysik Potsdam (Germany)
M. Woche, Leibniz-Institut für Astrophysik Potsdam (Germany)
U. Laux, Landessternwarte Thüringer (Germany)

Published in SPIE Proceedings Vol. 10012:
Integrated Modeling of Complex Optomechanical Systems II
Marco Riva, Editor(s)

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