Open Access
Table 1
Simulation parameters. The asterisk * indicates the variable parameters of this study. The other ones are fixed parameters.
| Turbulence | |
| Profile | ESO 35 layer median |
| Outer scale | L0 = 25 m |
| Seeing* | s = 0.4, 0.7, 1, 1.5, 2 arcsec |
| Coherence time | τ0 = 2 or 3 ms |
| Telescope | |
| Diameter | D = 8 m |
| Entrance pupil | VLT pupil with spiders |
| First stage | |
| WFS type | 40 × 40 SH |
| Wavelength | λWFS = 700 nm |
| Readout noise | 0.1 electrons/pixel |
| DM geometry | 41 × 41 + tip-tilt mirror |
| Loop delay | 0.84 ms |
| Second stage | |
| WFS type | 50 × 50 pyramid |
| Wavelength | λWFS = 1.05 or 1.2 μm |
| Readout noise | 0.24 electrons/pixel |
| Modulation radius* | 3, 2 and 1 λWFS/D |
| DM geometry | 26 × 26 |
| Loop delay | 0.33 ms |
| Image formation | |
| Wavelength | λ = 1.65 μm |
| NCPA amplitude | 45 nm RMS |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.