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MAGRITTE optomechanical design and mirror manufacturing
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Paper Abstract

The MAGRITTE telescopes are part of the SHARPP instrument suite, part of the Solar Dynamics Observatory (SDO), a NASA spacecraft to be launched in a geostationnary orbit in 2007. The MAGRITTE instrument package will provide high resolution images of the solar corona at high temporal frequency simultaneously in 5 EUV and in Ly-α narrow bandpasses. The 1.4 R0 MAGRITTE common field of view complements the other SHARPP instruments, as well as its spectral coverage with 6 narrow bandpasses located within the 19.5 to 120 nm interval. The key challenges of the MAGRITTE instrument are a high angular resolution (0.66 arcsec/pixel) with a high responsivity (exposure times smaller than 8 sec), combined with restricted spacecraft resources. The design of MAGRITTE is based on a high performance off-axis Ritchey-Chretien optical system combined with a large detector (4 K x 4 K, 12 µm pixel). The tight pointing stability performance of 1.2 arcsec over the image exposure time requires an active image motion control, using pointing information of a Guide Telescope, to compensate low frequency boresight variations produced by spacecraft jitter. The thermomechanical design and the mirror polishing are highly critical issues in the instrument design. This paper presents the MAGRITTE design concept with the expected performances based on a realistic error budget. The mirror polishing concept and performances are discussed.

Paper Details

Date Published: 18 February 2004
PDF: 9 pages
Proc. SPIE 5249, Optical Design and Engineering, (18 February 2004); doi: 10.1117/12.513998
Show Author Affiliations
Emmanuel Mazy, Ctr. Spatial de Liege (Belgium)
Jean-Marc Defise, Ctr. Spatial de Liege (Belgium)
Jean-Philippe Halain, Ctr. Spatial de Liege (Belgium)
Pierre Rochus, Ctr. Spatial de Liege (Belgium)
Laurence Rossi, Ctr. Spatial de Liege (Belgium)
Raymond Mercier, Institut d'Optique Theorique et Appliquee (France)
Marie-Francoise Ravet, Institut d'Optique Theorique et Appliquee (France)
Franck Delmotte, Institut d'Optique Theorique et Appliquee (France)
Mourad Idir, LIXAM (France)

Published in SPIE Proceedings Vol. 5249:
Optical Design and Engineering
Laurent Mazuray; Philip J. Rogers; Rolf Wartmann, Editor(s)

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