Main mirror assembly consists of:
Main mirror is fixed in the mirror cell in axial direction by three rigid
supports. Fixation along central bed of the cell in radial direction is
provided by levers with unequal arms inserted in the central hole of the
main mirror and furnished with temperature compensators to remove thermal
deformations of the mirror and the cell.
- mirror cell structure
- main mirror
- relief mechanisms
- rigid supports
- central bed
The butt relief of main mirror is implemented according to Lassel and
involves 18 relief mechanisms, three of which are replaced by rigid fixing
supports after the adjustment.
The side relief is similar with the relief mechanisms working in both
directions since mounting points are glued to the mirror. There are 16
radial relief mechanisms overall.
Three jacks are also provided in the cell to install and remove the
Main mirror facts and figures:
|Light diameter, mm
|Diameter of central hole, mm
Glass ceramic SO-115M
|Mass of main mirror, kg
|Mass of main mirror cell, kg