Support structure of LAMOST Schmidt plate MA

Xiangqun Cui; Dehua Yang

doi:10.1117/12.319259

25 August 1998 Support structure of LAMOST Schmidt plate M_A

Xiangqun Cui, Dehua Yang

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319259
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The Large Sky Area Multiobject Fiber Spectroscopic Telescope (LAMOST) is a very special designed reflecting Schmidt telescope. It will have both the large field of view (5 degrees) and the large aperture (4 meters). The reflecting Schmidt plate M_A will not only serve as the correcting plate for eliminating the spherical aberration of the primary mirror M_B, but also will serve as the tracking mirror simultaneously during the observation with an alt- azimuth mounting. The support structure of M_A, corresponding to its 24 hexagonal submirrors, is composed of 24 hexagonal submirror cells and a M_A primary cell which is a space truss structure. This paper presents the design and the analysis for the M_A support structure which mainly aided by the finite element method. It includes analyses of gravitational influence, the thermal deformation and the wind load influence. The dimension of the whole support structure is about 6 X 5 X 3 meters. The total mass of the structure is about 2 tons and the lowest natural frequency is 27.3 Hz. During 1.5 hours observation, the maximum image spread due to the gravitational deflection is less than 0.13 arcseconds. While the temperature gradient along the structure in vertical direction is 1 degree(s)C, the image spread due to the thermal deformation of the structure is less than 0.06 arcseconds.

Citation Download Citation

Xiangqun Cui and Dehua Yang "Support structure of LAMOST Schmidt plate M_A", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319259

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