Table B.1
Parameters of the PSIM model for the four GPAOs.
| Parameter | Description | Unit | GPAO1 | GPAO2 | GPAO3 | GPAO4 |
|---|---|---|---|---|---|---|
| COMMON | ||||||
| DM inclination | design | deg | 13.26 | 13.26 | 13.26 | 13.26 |
| DM strokea | measured | μm | 3.9 | 3.7 | 3.8 | 3.9 |
| NGS VIS (measured in HO 40 × 40) | ||||||
| DM/WFS pitch scaling | measured | % | 102.8 | 103.5 | 102.1 | 103.5 |
| DM/WFS registration angle | az−12.984+ | deg | 0.60 | 1.21 | −1.14 | −2.95 |
| DM/WFS anamorphosisb 0 | measured | % | 0 | 0 | 0 | 0 |
| DM/WFS anamorphosisb 45 | measured | % | 0 | 0 | 0 | 0 |
| Photometric pupil scale | measured | % | 97.0 | 96.9 | 96.8 | 97.1 |
| LGS | ||||||
| DM/WFS pitch scaling | measured | % | 101.3 | 102.2 | 101.2 | 102.0 |
| DM/WFS registration angle | az−12.984+ | deg | −88.00 | −91.74 | −88.65 | −88.35 |
| DM/WFS anamorphosis 0 | measured | % | −0.2 | −0.1 | −0.2 | −0.2 |
| DM/WFS anamorphosis 45 | measured | % | 0.1 | 0.0 | 0.1 | 0.0 |
| Photometric pupil scale | measured | % | − | − | − | 99.0 |
| NGS IR | ||||||
| DM/WFS pitch scaling | measured | % | 96.4 | 95.4 | 101.1 | 97.7 |
| DM/WFS registration angle | az−12.984+ | deg | 78.71 | 80.01 | 83.81 | 81.11 |
| DM/WFS anamorphosis 0 | measured | % | 0.6 | 3.7 | −0.4 | 0.3 |
| DM/WFS anamorphosis 45 | measured | % | 0.6 | −0.6 | −0.8 | 0.0 |
Notes. (a)In PSIM, the DM stroke is defined as the maximum mechanical deformation of the surface when pushing a single actuator, with respect to the reference. This mechanical stroke is achievable toward the positive and toward the negative direction. (b)The anamorphoses of the NGS VIS wavefront sensor were measured to be negligible with a fixed offset and an azimuthal contributions below 0.04% each. We consequently let them equal to 0% in the PSIM model.
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