Present status of the JNLT project

Keiichi Kodaira

doi:10.1117/12.19172

1 July 1990 Present status of the JNLT project

Keiichi Kodaira

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19172
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

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.

Citation Download Citation

Keiichi Kodaira "Present status of the JNLT project", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19172

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