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Numerical control matrix rotation for the LINC-NIRVANA Multi-Conjugate Adaptive Optics system

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arxiv 1008.4475 v1 pith:FNIBZRBB submitted 2010-08-26 astro-ph.IM

classification astro-ph.IM
keywords rotationsensorswave-frontmatrixadaptivecontrolderotationfocal
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LINC-NIRVANA will realize the interferometric imaging focal station of the Large Binocular Telescope. A double Layer Oriented multi-conjugate adaptive optics system assists the two arms of the interferometer, supplying high order wave-front correction. In order to counterbalance the field rotation, mechanical derotation for the two ground wave-front sensors, and optical derotators for the mid-high layers sensors fix the positions of the focal planes with respect to the pyramids aboard the wave-front sensors. The derotation introduces pupil images rotation on the wavefront sensors: the projection of the deformable mirrors on the sensor consequently change. The proper adjustment of the control matrix will be applied in real-time through numerical computation of the new matrix. In this paper we investigate the temporal and computational aspects related to the pupils rotation, explicitly computing the wave-front errors that may be generated.

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