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Closed Loop Performance

Closed Loop Performance. Laird Close and MagAO team SAC review. Requirement 1: The MagAO system high level VisAO Science Goal (bright stars). To obtain Strelhs of 10% or better in median seeing (0.7) on-axis at 0.8 um. This is equivalent to 190 nm rms residual wavefront error. Results.

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Closed Loop Performance

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  1. Closed Loop Performance Laird Close and MagAO team SAC review

  2. Requirement 1: The MagAO system high level VisAO Science Goal (bright stars) • To obtain Strelhs of 10% or better in median seeing (0.7) on-axis at 0.8 um. • This is equivalent to 190 nm rms residual wavefront error.

  3. Results

  4. Results Achieved “on-sky” 122 nm rms wavefront error at 800 Hz --- much better than 190nm goal

  5. Comparing to Simulations

  6. ERROR BUDGET

  7. Closing the Loop at 1000 Hz At 1000 Hz closed loop we can achieve 65 nm rms error in tower ~95nm “on-sky”. NOTE that this is a linear stretch. This is much better than the 190 nm rms requirement.

  8. See the movie! • http://www.youtube.com/watch?v=arjTorNtnCc&context=C4a1ba7aADvjVQa1PpcFNung4fzsYWr1SBl5fXtvLidUbAL4M9VSc= • Also see a video of how we close the loop here: • http://www.youtube.com/watch?v=wSiFoG8qgKI&context=C4a1917aADvjVQa1PpcFNung4fzsYWrw_ocFrcNJysPjatEvtUZbY=

  9. Comparing to Simulations

  10. Comparing to Simulations 68% “on-sky”

  11. Clio2 • Clio2 can do excellent science with higher wavefront errors. Hence there is a need for Faint Star Performance as well to increase sky-coverage.

  12. Goal 2: The MagAO system high level Clio2 Science Goal (faint stars) • To obtain Strelhs of 85% or better in median seeing (0.7”) on-axis at 3.8 um (L’) for a R=13 guide star. (or SR>96% at 8um on MIRAC4). • This is equivalent to 250 nm rms residual wavefront error.

  13. Performance on Faint stars Here we have in z’ a Strehl of 13% or 210 nm rms error. This would be about 9.5% “on-sky” or 221 nm rms. This is better than the faint star goal of 250 nm rms

  14. Summary: • Science requirement of <190 nm error for bright guide stars in median seeing is met, and improved on, by a significant margin with <95-122 nm rms achieved (800-1000 Hz, 400 modes) (by almost 2x lower in rms wavefront error). • Science requirement of <250 nm rms error for faint (R=13) guide stars is met and improved on with typically ~221 nm rms (200 Hz, 150 modes) is achieved.

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