Progress Report On The Technical Study Of The Japanese Telescope Project

The Japanese National Large Telescope (JNLT) proposed is an optical infrared telescope with an aperture of 7.5m, promoted by the Japanese astronomers community. The systematic conceptual study of the JNLT was started in 1984 at the Tokyo Astronomical Observatory (TAO) by its JNLT working group, of which the present authors are members. The study included optical designs, comparisons among different types of main mirror, mechanical structures, driving and guiding systems, control systems, and dome structure among others. We select some particular aspects in this report which may deserve to be discussed at the SPIE meeting. Although the details of individual topics will be published by specific contributors separately, those who are interested in each topic should contact the JNLT working group at TAO.