Fig. 1. Secondary mirror support structure

Fig. 2. Sketch of adjustment mechanism

Fig. 3. Overall structure of secondary mirror adjustment mechanism

Fig. 4. Correction unit mechanism

Fig. 5. Blade force analysis

Fig. 6. Finite element model of secondary mirror adjustment mechanism

Fig. 7. Deformation of mirror chamber under action of gravity at different zenith angles

Fig. 8. First two order mode shapes of system

Fig. 9. Secondary mirror adjustment mechanism prototype

Fig. 10. Z directional resolution test

Fig. 11. Motion resolution test results for displacement along Z direction

Fig. 12. Deflection accuracy test

Fig. 13. Measurement results of position accuracy of secondary mirror adjustment mechanism in Z direction

Fig. 14. Position absolute positioning error in Z direction at each position point

Fig. 15. Repeated positioning error in Z direction at each position point

Fig. 16. Attitude accuracy measurement results for deflection around X direction

Fig. 17. Absolute positioning error of attitude deflected around X direction

Fig. 18. Repeated positioning error of attitude angle at each position point