Transcript LTAOtestbed_Ammons.ppt

Anchor to LAO Lab Experiments
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Agenda for this discussion:
Role of a MOAO testbed
Improved results on LAO MCAO/MOAO
testbed / verification of tomography error
Guidelines for scaling test parameters
On-axis / Off-axis error budget
Primary MOAO testbed
deliverables
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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:
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Extensive trade studies with variation of many
related parameters
Finding tomography error
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Error budget terms are modeled with
simulation or verified empirically
Strategy:
1. Measure Strehl with all atmosphere at the ground
2. Derive fitting error, aliasing error, DM open-loop
error, and other terms
3. 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