LGS-AO Performance Characterization Plan AOWG meeting Dec. 5, 2003 A. Bouchez, D. Le Mignant, M. van Dam for the Keck AO team.

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Presentation transcript:

LGS-AO Performance Characterization Plan AOWG meeting Dec. 5, 2003 A. Bouchez, D. Le Mignant, M. van Dam for the Keck AO team

LGS-AO performance characterization effort Purpose (from CfAO proposal): 1. Demonstrate and characterize the Keck II LGS AO system for science via collaboration with the LGS and science AO community. 2. Using the output from goal 1, optimize the Keck LGS AO system and feed back the lessons learned to future LGS AO systems. Products: 1. Full LGS-AO error budget. 2. Accurate planning information for users. 3. New data on sodium layer structure and density variations.

LGS-AO Characterization Plan LGS-AO characterization effort is closely related to LGS-AO development priorities demonstration of LGS-AO observing modes. Goals On-axis performance (Strehl & FWHM vs. magnitude) fully characterized by Feb Off-axis performance (anisoplanatism, dither accuracy, etc.) documented by Aug

Error budgets Not one single error budget! 1. Performance Subsystems LGS performance Integrated system performance 2. Throughput 3. Field of view off-axis FOV dithering precision 4. Operational aspects Overheads Stability

Performance error budget (on-axis)

Sodium layer characterization Continuously monitor mean altitude through WFS focus. Continuously monitor sodium density through return power / projected power. Nightly map of density structure with unstacked images

NGS Strehl vs. magnitude

Subsystem performance Tip-tilt sensor stage - STRAP Residual tip-tilt as function of: 1. Star magnitude. 2. TT reference motion (asteroid, etc.) 3. Sky background (moonlight, raleigh). 4. Resolved sources (AGN, close binaries). Low-bandwidth wavefront sensor - Precision of wavefront measurement as function of: 1. Star magnitude & integration time. 2. Limit due to aberrations in LBWFS. 3. Off-axis location of tip-tilt stage. 4. Pupil rotation rate Tip-tilt sensor positioning accuracy 1. Repeatability 2. Accuracy Effect of LGS spot elongation on WFS measurement

LGS performance Laser spot size / elongation / power Temporal stability How it is affected by seeing Correlation against laser table diagnostic measurements LGS tip-tilt and jitter Flexure compensation performance Magnitude of atmosphere-induced jitter Residual tip-tilt after up-tip-tilt implementation Sodium layer Track mean altitude Power returned vs. power out (sodium density) Layer structure from unstacked images.

Integrated system performance Strehl on target versus Tip-tilt star magnitude. Tip-tilt star separation. Spot elongation / sodium altitude / elevation Laser power / sodium density Integration time Anisoplanatism Different from NGS? Focal anisoplanatism Predict from Cn2 profiles Measure from total error budget Operational aspects Acquisition overhead Dithering overhead Mean time between failures