6 July 2006 Optimization of the ATST primary mirror support system
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The Advanced Technology Solar Telescope (ATST) primary mirror is a 4.24-m diameter, 75-mm thick, off-axis parabola solid meniscus mirror made out of a glass or glass ceramic material. Its baseline support system consists of 120 axial supports mounted at the mirror back surface and 24 lateral supports along the outer edge with an active optics capability. This primary mirror support system was optimized for the telescope at a near horizon position to achieve the best gravity and thermal effects. To fulfill the optical and mechanical performance requirements, extensive finite element analyses using I-DEAS and optical analyses with PCFRINGE have been conducted for the support optimization. Analyses include static deformation (gravity and thermal), frequency calculations, and support system sensitivity evaluations. An influence matrix was established to compensate potential errors using an active optics system. Performances of the primary mirror support system were evaluated from mechanical deformation calculations and the optical analyses before and after active optics corrections. The performance of the mirror cell structure was also discussed.
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Myung K. Cho, Myung K. Cho, Ronald S. Price, Ronald S. Price, Il K. Moon, Il K. Moon, } "Optimization of the ATST primary mirror support system", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62731E (6 July 2006); doi: 10.1117/12.669865; https://doi.org/10.1117/12.669865

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