Open Access
Table 2.
AO loop configurations across an observing sequence.
| DM | DM | TT | Steering | |
|---|---|---|---|---|
| gain | control | gain | gain | |
| Long open-loop | 0 | Off | 0 | 0.2–0.4 |
| (10k frames) | ||||
| Dithering ×2 | 0 | Off | 0 (15 Hz mod.) | 0 |
| Open-loop ×2 | 0 | Off | 0 | 0.2–0.4 |
| Dithering ×2 | 0 | Off | 0 (15 Hz mod.) | 0 |
| TS closed loop ×2 | 0.2–0.4 | TS | 0.2–0.4 | 0.2–0.4 |
| LS ref. slopes | 0.2–0.4 | TS | 0.2–0.4 | 0.2–0.4 |
| LS closed loop ×2 | 0.2–0.4 | LS | 0.2–0.4 | 0.2–0.4 |
| Dithering ×2 | 0 | Off | 0 (15 Hz mod.) | 0 |
| Low gain ×2 | 0.01 | TS | 0.2–0.4 | 0.2–0.4 |
| Dithering ×2 | 0 | Off | 0 (15 Hz mod.) | 0 |
| Open-loop ×2 | 0 | Off | 0 | 0.2–0.4 |
| Dithering ×2 | 0 | Off | 0 (15 Hz mod.) | 0 |
Notes. Each configuration is applied to two consecutive acquisitions. DM control ‘Off’ means that the DM is maintained in a fixed shape.
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