Preliminary Design Review

1. Preliminary Design Review Katie Schwertz Optics 523 April 3, 2009

2. Overview • Mounting an illumination lens and test plate into a single cell • Lens diameters = 16” • Material = Fused Silica Illumination Lens Test Plate

3. Requirements Review • Test Plate • Concave surface: RMS slope error < 10 nm/cm (0.1 urad) • Alignment of lenses • 100 um position • 1 mrad angle • 10 mm nominal separation (100 um tolerance) • Adjustment of cell • 0.2 urad angular sensitivity • 0.15um translation sensitivity (along axis) • Coarse and fine adjustments • Interface • Access points needed at 3 points around cell for a feeler gauge measurement • Test plate will be 5 mm away from next surface • Cell will sit within another cell on rollerballs in kinematic grooves

4. Interface 12 sets of kinematic grooves around diameter Piezoelectric stages will drive this cell from underneath (Z-direction) to obtain fine axial adjustments required

5. Design Concept 3 counterweight supports 6 axial flexures Mirror adjuster/micrometer access points (3)

6. Slope analysis: 6 point flexure RMS Slope Error = 1.35 nm/cm

7. Flexure Properties Vukabratovich, pg. 145-146 Flexure Material: CRES 17-4

8. Design Concept 3 counterweight supports 6 axial flexures Mirror adjuster/micrometer access points (3)

9. Counterweight Vukabratovich, pg 297

10. Flexure Positioning (1) • Apply moment to each flexure attachment point • See how much slope error is imparted onto the lens with a given angle

11. Flexure Positioning (2)  • Adjust angle of flexures to determine optimal angle to mount flexures

12. Action Items • Finish Solidworks models of interfaces and counterweights • Determine moment tolerance • Determine optimal angle of flexures • Determine thickness/stiffness of cell needed

13. Appendix – Lens Drawings

14. Appendix – Lens Drawings