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Proceedings Paper

Present status of the JNLT project
Author(s): Keiichi Kodaira
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Paper Abstract

The Japanese National Large Telescope's 7.5-m diameter mirror will be of 20-cm thickness, thin-meniscus type. In conjunction with the use of a low thermal expansion coefficient material, this mirror concept is anticipated to have a lowest eigenfrequency of about 15 Hz; a floating support system will be employed which uses 264 contacts with the mirror. An altazimuth fork mount in conjunction with an oil mount-supported truss structure. The design of the structure is such as to allow ready access to the Cassegrain focus for polarimetric and IR bandpass studies. Pointing accuracy is projected to be better than 1 arcsec.

Paper Details

Date Published: 1 July 1990
PDF: 7 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19172
Show Author Affiliations
Keiichi Kodaira, National Astronomical Observatory (Japan)

Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

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