Present status of the JNLT project

Details Present status of the JNLT project Present status of the JNLT project

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236...56k&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 1 (A91-23201 08-89

Astronomy and Astrophysics

Astronomy

1

Astronomical Observatories, Infrared Telescopes, Mirrors, Actuators, Angular Resolution, Optical Equipment, Support Systems, Systems Engineering, Wind Tunnel Tests

Scientific paper

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.

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