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arXiv 2207.08451astro-ph.IM
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HARMONI在ELT:为ELT设计laser引导星波前传感器

HARMONI at ELT: designing a laser guide star wavefront sensors for the ELT

Anne Costille, Anne Bonnefoi, Edgard Renault, William Ceria, Kjetil Dohlen, Benoit Neichel, Zoltan Hubert, Jean-Jacques Correia, Thibaut Moulin, Saul Menendez M… 展开作者

Anne Costille, Anne Bonnefoi, Edgard Renault, William Ceria, Kjetil Dohlen, Benoit Neichel, Zoltan Hubert, Jean-Jacques Correia, Thibaut Moulin, Saul Menendez Mendoza, Thierry Fusco, Pascal Vola, Felipe Pedreros, Pierre Jouve, El Kacem, Fraser Hadi, Hermine Schnetler, Dave Melotte, Niranjan Thatte

摘要:

HARMONI是ELT的第一台可见光和近红外积分场光谱仪,覆盖了450 nm至2450 nm的大光谱范围,分辨率为3500至18000,空间采样为60 mas至4 mas。它可以在两种自适应光学模式(SCAO和LTAO)下工作,也可以不使用AO。该项目正在为最终设计审查做准备。激光断层AO(LTAO)系统通过两个系统提供了具有非常高天空覆盖率的AO校正:激光引导星敏感器(LGSS)和自然引导星敏感器(NGSS)。LGSS专门用于分析ELT产生的6颗激光引导星的波前。它由6个独立的波前传感器(WFS)模块组成,安装在直径为600 mm的旋转器上,以将瞳孔稳定在探测器前面的微透镜阵列上。光学设计接受长达16弧秒的细长光斑,使用SONY的CMOS探测器无截断。我们将介绍基于自由曲面透镜的LGSS的最终光学和机械设计,以最大限度地减少光学元件的数量,并适应钠层配置的多样性。我们将专注于旋转器的设计,说明我们将如何在限制性环境中以90”的精度移动1吨。最后,我们将提出在HARMONI环境中验证系统的策略。验证的主要挑战是如何在不访问ELT的一部分可变形镜的情况下测试AO系统。

英文摘要:

HARMONI is the first light visible and near-IR integral field spectrograph for the ELT covering a large spectral range from 450nm to 2450nm with resolving powers from 3500 to 18000 and spatial sampling from 60mas to 4mas. It can operate in two Adaptive Optics modes-SCAO and LTAO-or with no AO. The project is preparing for Final Design Reviews. The laser Tomographic AO (LTAO) system provides AO correction with very high sky-coverage thanks to two systems: the Laser Guide Star Sensors (LGSS) and the Natural Guide Star Sensors (NGSS). LGSS is dedicated to the analysis of the wavefront coming from 6 laser guide stars created by the ELT. It is made of 6 independent wavefront sensor (WFS) modules mounted on a rotator of 600mm diameter to stabilise the pupil onto the microlens array in front of the detector. The optical design accepts elongated spots of up to 16 arcsec with no truncation using a CMOS detector from SONY. We will present the final optical and mechanical design of the LGSS based on freeform lenses to minimize the numbers of optical components and to accommodate for the diversity of sodium layer configurations. We will focus on rotator design, illustrating how we will move 1 tons with 90" accuracy in restrictive environment. Finally, we will present the strategy to verify the system in HARMONI context. The main challenge for the verification being how to test an AO system without access to the deformable mirror, part of the ELT.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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