Anchor to LAO Lab Experiments

Agenda for this discussion:

1. Role of a MOAO testbed

2. Improved results on LAO MCAO/MOAO testbed / verification of tomography error

3. Guidelines for scaling test parameters

4. On-axis / Off-axis error budget

Primary MOAO testbed deliverables

• Verify untested/theoretical terms in WF error budget for several key cases

• Uncover hidden errors and concerns (several examples after tour)

• Feedback to optical design and cost estimates• Demonstrate feasibility of key technologies

What NOT to look for:• Extensive trade studies with variation of many

related parameters

Finding tomography error

• Error budget terms are modeled with simulation or verified empirically

• Strategy: 1. Measure Strehl with all atmosphere at the ground2. Derive fitting error, aliasing error, DM open-loop

error, and other terms3. Measure Strehl with an MOAO-type open-loop

correction utilizing LTAO with distributed atmosphere

4. Difference in Strehls due to tomography error and scintillation

Response of tomography to wavefront error