Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..132.&link_type=abstract
In its LEST: Large European Solar Telescope p 132-177 (SEE N82-32209 22-89)
Physics
Reflecting Telescopes, Solar Instruments, Systems Engineering, Image Enhancement, Image Motion Compensation, Pointing Control Systems, Supports, Temperature Control, Towers, Windows (Apertures)
Scientific paper
The physical implications of adopting a Ritchey-Chretien plus triple coelostat design for the large European solar telescope are discussed. Two hyperbolically figured mirrors form an image in an aplanatic focus that is free from spherical aberration and coma. The heat rejecting system has to cope with between 4 and 5 KW energy. The modulation transfer function is 0.20 for 0.1 arcsec spatial resolution. The reimaging system can be either an inverted quasi-Cassegrain system, or a triplet apochromatic lens system. A coelostat mirror can act as a deformable phase plate for a real time atmospheric compensation system. Only a coelostat mounting provides a nonrotating image in the final image plane. The image stabilization system must handle peak to peak motions of from 3 to 4 arcsec, and frequencies up to 50 Hz. Telescope mount, cladding, and tower options are discussed.
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