MMT-AO performances: discussion G. Brusa. Outline Interaction matrix AO system model Calibration issues Performance estimation Tip-tilt error Accelerometer.

Slide 1MMT-AO performances: discussion G. Brusa Slide 2Outline Interaction matrix AO system model Calibration issues Performance estimation Tip-tilt error Accelerometer data Slide 3Interaction matrix Slide 4AO system model DM t CREC WFS s in s off s out + - + + Slide 5AO Block Diagram WFSC Turbulence Adaptive Secondary WFSIWFSI SSCSSC RTRRTR DMIDMI DDS sposlortrcom, pos, cur Slide 6Seeing vs. g’ factor Slide 7Best performances H band Seeing 0.4” SR –40% (SE) –20-30% (LE) Slide 8Slide 9Slide 10Uncorrected tip-tilt 10mas ; Total 30mas (single axis) Slide 11Secondary Tilt and Decenter (I) dax = 300 nm rms day = 300 nm rms dlx = 1600 nm rms dly = 300 nm rms da = 15.4 nm/mas dl = 43.1 nm/mas Slide 12Secondary Tilt and Decenter (II) dax = 170 nm rms day = 130 nm rms dlx = 310 nm rms dly = 120 nm rms da = 15.4 nm/mas dl = 43.1 nm/mas Slide 13Conclusions How are we going to measure the interaction matrix ? Is there an equivalent g’ for the pyramid sensor ? How are we going to setup the diagnostics both from WFC and technical camera ? Do we need to implement a feedforward correction of vibrations ?