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MMT-AO performances: discussion

MMT-AO performances: discussion. G. Brusa. Outline. Interaction matrix AO system model Calibration issues Performance estimation Tip-tilt error Accelerometer data. Interaction matrix. t. s off. s out. +. REC. C. DM. +. +. -. s in. WFS. AO system model. Turbulence. W F S

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MMT-AO performances: discussion

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  1. MMT-AO performances: discussion G. Brusa

  2. Outline • Interaction matrix • AO system model • Calibration issues • Performance estimation • Tip-tilt error • Accelerometer data

  3. Interactionmatrix

  4. t soff sout + REC C DM + + - sin WFS AO system model

  5. Turbulence W F S I S S C R T R D M I Adaptive Secondary spo slo rtr com, pos, cur DDS WFSC AO Block Diagram

  6. Seeing vs. g’ factor

  7. Best performances • H band • Seeing 0.4” • SR • 40% (SE) • 20-30% (LE)

  8. ; 10mas Uncorrected tip-tilt Total 30mas (single axis)

  9. Secondary Tilt and Decenter (I) da = 15.4 nm/mas dl = 43.1 nm/mas dax= 300 nm rms day= 300 nm rms dlx= 1600 nm rms dly= 300 nm rms

  10. Secondary Tilt and Decenter (II) da = 15.4 nm/mas dl = 43.1 nm/mas dax= 170 nm rms day= 130 nm rms dlx= 310 nm rms dly= 120 nm rms

  11. Conclusions • 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 ?

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