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Monte-Carlo simulation of ELT scale multi-object adaptive optics deformable mirror requirements and tolerances

机译：ELT尺度多目标自适应光学系统的monte-Carlo模拟   可变形的镜子要求和公差

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Multi-object adaptive optics (MOAO) has been demonstrated by the CANARYinstrument on the William Herschel Telescope. However, for proposed MOAOsystems on the next generation Extremely Large Telescopes, such as EAGLE, manychallenges remain. Here we investigate requirements that MOAO operation placeson deformable mirrors (DMs) using a full end-to-end Monte-Carlo AO simulationcode. By taking into consideration a prior global ground-layer (GL) correction,we show that actuator density for the MOAO DMs can be reduced with littleperformance loss. We note that this reduction is only possible with theaddition of a GL DM, whose order is greater than or equal to that of theoriginal MOAO mirrors. The addition of a GL DM of lesser order does not affectsystem performance (if tip/tilt star sharpening is ignored). We also quantifythe maximum mechanical DM stroke requirements (3.5 $\mu$m desired) and providetolerances for the DM alignment accuracy, both lateral (to within an eighth ofa sub-aperture) and rotational (to within 0.2$^\circ$). By presenting resultsover a range of laser guide star asterism diameters, we ensure that theseresults are equally applicable for laser tomographic AO systems. We provide theopportunity for significant cost savings to be made in the implementation ofMOAO systems, resulting from the lower requirement for DM actuator density.
机译：William Herschel望远镜上的CANARYinstrument演示了多目标自适应光学（MOAO）。但是，对于下一代超大型望远镜（如EAGLE）上提出的MOAO系统，仍然存在许多挑战。在这里，我们研究了使用完整的端到端蒙特卡洛AO仿真代码对MOAO操作放置可变形镜（DMs）的要求。通过考虑先前的全局接地层（GL）校正，我们表明MOAO DM的执行器密度可以降低，而性能损失很小。我们注意到，只有通过添加GL DM才能实现这种减少，该GL DM的顺序大于或等于原始MOAO镜的顺序。添加较小顺序的GL DM不会影响系统性能（如果忽略了尖端/倾斜星锐化）。我们还量化了最大机械DM行程要求（所需3.5μm），并提供了DM对准精度的容差，包括横向（在子孔径的八分之一以内）和旋转（在0.2 ^以内）。通过在一系列激光导星星形直径上给出结果，我们确保这些结果同样适用于激光断层扫描AO系统。由于对DM执行器密度的要求较低，我们为MOAO系统的实施提供了可节省大量成本的机会。

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