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0.75 mm Wedge, Supported on Three Hydraulic Sectors, CG is offset 0.77 mm relative to sectors

0.75 mm Wedge, Supported on Three Hydraulic Sectors, CG is offset 0.77 mm relative to sectors. Surface is 8.57 nm rms Glass density in model is still 1.2 x actual. Zernike Coefficients, nano-meters. Astigmatism. Power. Coma. Spherical. Geometry of the wedged mirror (100 mm thick).

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0.75 mm Wedge, Supported on Three Hydraulic Sectors, CG is offset 0.77 mm relative to sectors

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  1. 0.75 mm Wedge, Supported on Three Hydraulic Sectors, CG is offset 0.77 mm relative to sectors • Surface is 8.57 nm rms • Glass density in model is still 1.2 x actual.

  2. Zernike Coefficients, nano-meters Astigmatism Power Coma Spherical

  3. Geometry of the wedged mirror (100 mm thick) Thickest point Sector Boundary FEM node number Actuators

  4. Lateral Load, 6 Tangent Supports • Tangent supports in CG plane, optimized axial forces: • 15.34 nm rms surface • Tangent supports in 0.16” forward of CG plane (1.25” above back), optimized axial forces: • 13.23 nm rms surface

  5. Lateral Support Without Correction • Three Tangent Supports: • 1 g Lateral …. 219 nm rms • Six Tangent Supports: • 1 g Lateral …. 59 nm rms • Strap Support • 1 g Lateral ….. 47 nm rms

  6. Correction of Low Order Components • The magnitude of low order terms that can be corrected by 15 N maximum forces. • Procedure used: • Assume a 1 wave Zernike shape (coefficient = 1 wave). • Calculated optimum correction forces. • Scale from maximum optimum correction force to find shape coefficient that can be corrected with a 15 N force limit. • Residual is the surface distortion left after the Zernike shape is corrected. For example 0.05 waves of spherical can be corrected by a set of forces not exceeding 15 N to leave 0.4 nm-rms surface distortion. These are the data used to derive the results above.

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