Physics – Optics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..109.&link_type=abstract
In its LEST: Large European Solar Telescope p 109-131 (SEE N82-32209 22-89)
Physics
Optics
Lens Design, Reflecting Telescopes, Solar Observatories, Cassegrain Optics, Field Of View, Heliostats, Polarization Characteristics, Spatial Resolution, Temperature Control, Windows (Apertures)
Scientific paper
The Ritchey-Chretien (A), concurrent (B), Gregorian (C), heliostat-single spherical mirror (D), and heliostat-Cassegrain Schiefspiegler systems (D) are considered in view of the large European solar telescope requirements, e.g., as to number of optical elements, field of view, and instrument polarization. The 0.1 arcsec spatial resolution can only be met by using a multiple element window with any of the systems. Systems A, B, and C meet the need for low polarization. Systems D and E provide largest field of view. System D has two mirrors, B, C, and E have four. Direct pointing approaches (A, B, C) produce thermal problems, but thermal control, using heat rejecting systems, can overcome these for cases A and B. System C has no heating of the secondary mirror. Overall, systems A, B, and C best match specifications.
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