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Zero distortion three mirror telescope designed for the Dark Universe Explorer (DUNE) space mission

机译:零畸变三镜望远镜专为黑暗宇宙探索者(DUNE)太空任务而设计

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摘要

A feasibility study is presently led by CNES for the Dark UNiverse Explorer (DUNE), a space mission designed to provide unprecedented constraints on dark matter and dark energy using weak gravitational lensing measurements over a very large region of the sky (20 000 square degrees). To achieve this scientific goal, the instrument requires a stable 0.23 arc second FWHM PSF with very low ellipticity (6%) over a field of view of 0.55 square degree. To perform the survey we adopted the drift scan mode which brings many advantages in this type of mission but adds the unusual requirement of a zero distortion optical design. We will present the optical performances of a 1.2 meters Korsch three mirror telescope concept (called NODI for NO Distortion) where the third mirror works with an atypical large magnification and a slightly curved focal surface to obtain zero distortion over an annular 1.7 degrees field of view. A mosaic of 64 CCD detectors of 8 Mega pixels each is shown to pave the curved focal surface without significant degradation of the distortion.
机译:CNES目前正在对“暗宇宙探索者”(DUNE)进行可行性研究,这是一项太空任务,旨在通过在很大的天空区域(20000平方度)上使用弱引力透镜测量来对暗物质和暗能量提供空前的约束。 。为了实现这一科学目标,该仪器需要在0.55平方度的视野范围内具有稳定的0.23弧秒FWHM PSF,且椭圆率非常低(6%)。为了执行调查,我们采用了漂移扫描模式,该模式在此类任务中具有许多优势,但增加了零失真光学设计的特殊要求。我们将介绍1.2米Korsch三镜望远镜概念(称为NODI,表示无失真)的光学性能,其中第三个镜具有非典型的大放大倍率和稍微弯曲的焦面,以在环形1.7度视场上获得零失真。 。示出了每个8兆像素的64个CCD检测器的马赛克铺平弯曲的焦面,而不会显着降低失真。

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