Open Access
Table 1.
AO numerical simulation parameters.
| Numerical simulation configuration | ||||
|---|---|---|---|---|
| D = 39 m diameter | ||||
| Telescope | ELT pupil | |||
| 798 aggregated hexagons | ||||
| No support spiders | ||||
| von Kármán, ground layer only | ||||
| r0 at 500 nm: variable in a | ||||
| Turbulence layer | useful range of 7.0–35.0 cm | |||
| L0 = 25 m | ||||
 m s−1 |
||||
| PWFS | ||||
| Subapertures | 92 × 92 – pixel size 42 cm. | |||
| 24 080 useful pixels | ||||
| Wavelength | Monochromatic, 658 nm | |||
| Throughput | 0.28 (including quantum efficiency) | |||
| Modulation | Circular, 4 radius |
|||
| Readout noise | 0.3 e− | |||
| Source | On-axis natural guide star | |||
| Guide star flux | Zero point: 2.6 × 1010 ph s−1 m−2 | |||
| Tip-tilt mirror | ||||
| Hexagonal M4 model pattern | ||||
| Adaptive mirrors | Pitch of 54 cm | |||
| Coupling of 0.24 | ||||
| 4310 controlled actuators | ||||
| Both with infinite bandwidth | ||||
| RTC controller | ||||
| Loop rate | 500 Hz | |||
| Method | Linear modal integrator | |||
| Latency | Data flow 1 frame + MVM 1 frame | |||
| Basis | DM Karhunen–Loève basis (a) | |||
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