1. Active Optics and Wavefront Sensing at the Upgraded 6.5-meter MMT Xiaoyin Zhu Dec 12, 2012 OPTI 521 Paper Synopsis By T.E. Pickering, etc.

2. Contents  Background-MMT  Wavefront sensing system  Current work

3. Background http://www.mmto.org/  MMT Multiple Mirror Telescope 6.5-meter diameter  Operated by MMT Observatory (MMTO)  Location: Mt. Hopkins 60 kilometers (37 miles) south of Tucson, AZ

4. Background The Original MMT (1979-1998)New MMT Telescope (2000- Date)

5. Background  Classical Cassegrain optical design

6. F/5 MMTF/9 F/15 Background

7. F/9 wavefront sensor

9.  Representative reference (left) and data (right) images taken with the f/9 Shack-Hartmann wavefront sensor

10. F/5 wavefront sensor

11. F/5 Focus Lenslet Array FL= 40 mm Collimator FL= 40 mm CCD Negative field lens  A negative field lens is added to image the system pupil on the lenslet array

12. F/5 wavefront sensor  Representative reference (left) and data (right) images taken with the f/5 wavefront sensor

13. WAVEFRONT ANALYSIS AND SOFTWARE

14. Results and performance Before correction After correction

15. Upgrade the F/9 Wavefront sensor  Current system has some cutoff at the edges  Ideal image fits the lenslet array

16. Upgrade the F/9 Wavefront sensor

18. Thank you!