Effect of Gemini primary mirror position relative to the lateral support on mirror figure

Myung K. Cho; Larry M. Stepp

doi:10.1117/12.391507

20 July 2000 Effect of Gemini primary mirror position relative to the lateral support on mirror figure

Myung K. Cho, Larry M. Stepp

Author Affiliations +

Proceedings Volume 4003, Optical Design, Materials, Fabrication, and Maintenance; (2000) https://doi.org/10.1117/12.391507
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

The Gemini primary mirror support incorporates a system of hydraulic whiffletrees to carry the mirror weight and define its position. The six orthogonal kinematic degrees of freedom are controlled by six hydraulic zones--three axial, two lateral, plus a transverse lateral. By varying the fluid volumes in these hydraulic zones the mirror position can be adjusted in all six degrees of freedom. Because of the finite lengths of the linkages that connect the mirror to the lateral supports, any shift in mirror position changes the amplitudes and directions of the applied forces with a resulting effect on the static balance and mirror figure. These effects have been calculated for mirror translations and rotations in all six degrees of freedom, resulting in predictions of the changes in the axial and lateral support forces and in the mirror figure. This paper describes the modeling as well as experimental verification of the results.

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Myung K. Cho and Larry M. Stepp "Effect of Gemini primary mirror position relative to the lateral support on mirror figure", Proc. SPIE 4003, Optical Design, Materials, Fabrication, and Maintenance, (20 July 2000); https://doi.org/10.1117/12.391507

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