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Analysis of wavefront reconstruction in 8-meter ring solar telescope

机译：8米环形太阳望远镜的波前重建分析

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摘要

Chinese Giant Solar Telescope (CGST) is the next generation infrared and optical solar telescope of China, which is proposed and pushed by the solar astronomy community of China and listed into the National Plans of Major Science and Technology Infrastructures. CGST is currently proposed to be an 8 meter Ring Solar Telescope (RST) with width of 1 meter, the hollow and symmetric structure of such an annular aperture facilitates the thermal control and high precision magnetic field measurement for a solar telescope. Adaptive optics (AO) is an indispensable tool of RST to obtain diffraction limited observations. How to realize AO involved wavefront sensing and correcting, and the degree of compensating in a narrow annular aperture is the primary problem of AO implementation of RST. Wavefront reconstruction involved problems of RST are first investigated and discussed in this paper using end to end simulation based on Shack-Hartmann wavefront sensing (SHWFS). The simulation results show that performance of zonal reconstruction with measurement noise no more than 0.05 arc sec can meets the requirement of RST for diffraction-limited imaging at wavelength of 1μm, which satisfies most science cases of RST in near infrared waveband.
机译：中国巨型太阳望远镜（CGST）是中国的下一代红外和光学太阳望远镜，由中国太阳天文学界提出并推动，并被列入国家重大科学技术基础设施计划中。 CGST当前被提议为宽度为1米的8米环形太阳望远镜（RST），这种环形孔的中空且对称的结构有利于太阳望远镜的温度控制和高精度磁场测量。自适应光学（AO）是RST不可或缺的工具，用于获得衍射受限的观察结果。如何实现AO涉及到波前的检测和校正，以及在窄环形孔径内的补偿程度是RST实现AO的主要问题。本文首先利用基于Shack-Hartmann波前感测（SHWFS）的端到端仿真研究和讨论了涉及RST问题的波前重建。仿真结果表明，测量噪声不超过0.05 arc sec的区域重建性能可以满足RST对波长为1μm的衍射极限成像的要求，满足了近红外波段RST的大多数科学案例。

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