Front end of the SPIRou spectropolarimeter for Canada-France Hawaii Telescope
Front end of the SPIRou spectropolarimeter for Canada-France Hawaii Telescope
复制标题
加拿大-法国夏威夷望远镜 SPIRou 分光偏振仪的前端
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Wang
中科院分区：
文献类型：
--
作者：
L. Parès;J. Donati;M. Dupieux;T. Gharsa;Y. Micheau;M. Bouyé;B. Dubois;G. Gallou;D. Kouach;G. Barrick;S. Wang
SPIRou是一个近红外（0.98-2.35μm）中阶梯分光偏振计/高精度速度计，被设计为夏威夷莫纳克亚山3.6米加拿大-法国-夏威夷望远镜的下一代仪器，主要目标是探测低质量恒星周围的类地行星和形成恒星的磁场。SPIRou独特的科学和技术能力在一系列七篇配套论文中进行了描述。本文介绍了该仪器的前端部分。位于望远镜的卡塞格伦焦平面上，前端由大气色散校正器、具有图像稳定单元（0.03弧秒RMS稳定目标）的视场观察器、校准轮和基于菲涅耳菱形的消色差偏振计单元组成。偏振计允许圆偏振和线偏振分析。菲涅耳菱体的延迟在整个光谱域中标称地优于0.5%。评估和减少前端的热背景是仪器的一个挑战部分。
SPIRou is a near-IR (0.98-2.35μm), echelle spectropolarimeter / high precision velocimeter being designed as a nextgeneration instrument for the 3.6m Canada-France-Hawaii Telescope on Mauna Kea, Hawaii, with the main goal of detecting Earth-like planets around low-mass stars and magnetic fields of forming stars. The unique scientific and technical capabilities of SPIRou are described in a series of seven companion papers. In this paper, the Front End of the instrument is presented. Positioned at the Cassegrain Focal plane of the telescope, the front end is constituted of an atmospheric dispersion corrector, a field viewer with an image stabilization unit (0.03 arc seconds RMS stabilization goal), a calibration wheel and an achromatic polarimeter unit based on Fresnel Rhombs. The polarimeter permits the circular and linear polarization analysis. The retardance of the Fresnel rhombs is nominal to better than 0.5% in the whole spectral domain. The evaluation and the reduction of the thermal background of the Front end is a challenging part of the instrument.