Large chopping secondary mirror for the 15-m submillimeter James Clerk Maxwell telescope

Details Large chopping secondary mirror for the 15-m submillimeter James Clerk Maxwell telescope Large chopping secondary mirror for the 15-m submillimeter James Clerk Maxwell telescope

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apopt..26.3446v&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 26, Aug. 15, 1987, p. 3446-3454. SERC-ZWO-supported research.

Physics

Optics

4

Design Analysis, Infrared Telescopes, Mirrors, Reflecting Telescopes, Submillimeter Waves, Fabrication, Gimbals, Moments Of Inertia, Netherlands, United Kingdom

Scientific paper

A 75-cm diam chopping secondary mirror has been developed for the 15-m diam James Clerk Maxwell telescope. The large focal ratio (D/F = 1:0.36) requires a highly convex secondary mirror, which was manufactured out of a solid slab of high-grade aluminum, consisting of a 3-mm thick shell with a support ring along the edge. The mirror surface approaches a predescribed hyperboloid with a rms precision better than 9 microns, which is adequate for use in the submillimeter wavelength region. The design aspects, the performance of a two-axis chopping mechanism, and the construction of the mirror are described.

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