The HARPS-North@TNG polarimeter
The HARPS-North@TNG polarimeter
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HARPS-North@TNG 旋光计
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
S. Scuderi
中科院分区：
文献类型：
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作者：
F. Leone;M. Cecconi;R. Cosentino;A. Ghedina;M. Giarrusso;M. Hernández Díaz;Manuel Gonzalez;M. Munari;H. Pérez Ventura;L. Riverol;J. J. San Juan Gómez;S. Scuderi
用于深度观测的多AO成像相机（MICADO）是39米欧洲极大望远镜（E-ELT）的第一个光学仪器，正在设计和优化，以与多共轭自适应光学（MCAO）模块MAORY（0.8-2.5 μm）一起工作。MICADO仪器的当前概念包括顶部带有波前传感器（WFS）的结构低温恒温器（2.1 m直径和2 m高度）。低温恒温器通过其中心法兰安装，并与直径为2.5米的大型高精度轴承直接连接，该轴承可旋转整个相机（加上波前传感器）组件，以实现图像去旋转，而无需单独移动光学元件。整个组件通过六足式支撑结构悬挂在E-ELT Nasmyth平台上方3.6 m处。我们描述了MICADO反旋转器的设计，这是一个关键机构，必须以优于10角秒的角定位精度绕其光轴精确旋转低温恒温器/SCAO-WFS组件，以补偿由于E-ELT的垂直方位角安装而产生的场旋转。特别注意的是，在设计阶段，静态和动态行为被认为是并行模拟的反旋器的性能。使用详细的有限元模型（FEM）进行静态弯曲分析，同时使用Matlab/Simulink中实现的除旋器的数学模型进行动态仿真。最后，这两个方面必须通过一个现实的端到端模型结合起来。实验设计，以证明目前的概念MICADO反旋器也提出了这项工作。
The Multi-AO Imaging Camera for Deep Observations (MICADO), a first light instrument for the 39 m European Extremely Large Telescope (E-ELT), is being designed and optimized to work with the Multi-Conjugate Adaptive Optics (MCAO) module MAORY (0.8-2.5 μm). The current concept of the MICADO instrument consists of a structural cryostat (2.1 m diameter and 2 m height) with the wavefront sensor (WFS) on top. The cryostat is mounted via its central flange with a direct interface to a large 2.5-m-diameter high-precision bearing, which rotates the entire camera (plus wavefront sensor) assembly to allow for image derotation without individually moving optical elements. The whole assembly is suspended at 3.6 m above the E-ELT Nasmyth platform by a Hexapod-type support structure. We describe the design of the MICADO derotator, a key mechanism that must precisely rotate the cryostat/SCAO-WFS assembly around its optical axis with an angular positioning accuracy better than 10 arcsec, in order to compensate the field rotation due to the alt-azimuth mount of the E-ELT. Special attention is being given to simulate the performance of the derotator during the design phase, in which both static and dynamics behaviors are being considered in parallel. The statics flexure analysis is done using a detailed Finite Element Model (FEM), while the dynamics simulation is being developed with the mathematical model of the derotator implemented in Matlab/Simulink. Finally, both aspects must be combined through a realistic end-to-end model. The experiment designed to prove the current concept of the MICADO derotator is also presented in this work.