Precision thermal control of the GMT-Consortium Large Earth Finder (G-CLEF)
Precision thermal control of the GMT-Consortium Large Earth Finder (G-CLEF)
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GMT 联盟大型地球探测器 (G-CLEF) 的精确热控制
DOI：
10.1117/12.2314038
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发表时间：
2018
影响因子：
2.8
通讯作者：
A. Uomoto
中科院分区：
文献类型：
--
作者：
Mark Mueller;D. Baldwin;S. Ben;Daniel Durusky;I. Evans;Janet D. Evans;T. Gauron;K. McCracken;S. McMuldroch;Cem Onyuksel;Sang C. Park;D. Plummer;W. Podgorski;A. Szentgyorgyi;A. Uomoto
GMT-Consortium Large Earth Telescope（G-CLEF）将成为巨型麦哲伦望远镜（GMT）第一代仪器套件的一部分。G-CLEF将是一个通用光学通带阶梯光栅摄谱仪，具有10厘米/秒的精确径向速度能力，这是探测地球类似物所必需的。该仪器对热效应特别敏感，并且仅通过使用低CTE材料无法实现必要的稳定性。低CTE材料和精密热控制的结合将使仪器达到其精度要求。G-CLEF将于2018年年中完成关键设计阶段。在本文中，我们讨论了精确的热控制系统，使毫开尔文级的光谱仪及其红色和蓝色焦平面的稳定性。描述了光谱仪中使用的测量电子学和热控制策略。特别重要的是一个连续的液氮流低温冷却器系统的发展，用于保持在稳定的低温工作温度的焦平面。该系统已通过在仪器设计阶段完成的原型设计工作进行了验证。我们还回顾了G-CLEF的隔热外壳，它同时保持摄谱仪稳定的温度，并限制了最大的热泄漏到望远镜圆顶。这项工作得到了GMTO公司的支持，GMTO公司是一个代表国际大学和机构联盟运作的非营利组织：亚利桑那州立大学、澳大利亚天文学有限公司、澳大利亚国立大学、卡内基科学研究所、哈佛大学、韩国天文学和空间科学研究所、圣保罗研究基金会、史密森学会、得克萨斯大学奥斯汀分校、德克萨斯AM大学、亚利桑那大学和芝加哥大学。
The GMT-Consortium Large Earth Finder (G-CLEF) will be part of the first generation instrumentation suite for the Giant Magellan Telescope (GMT). G-CLEF will be a general purpose optical passband echelle spectrograph with a precision radial velocity (PRV) capability of 10 cm/sec, a requirement necessary for the detection of Earth analogues. The instrument will be particularly sensitive to thermal effects and the necessary stability cannot be achieved through the use of low CTE materials alone. It is the combination of low CTE materials and exquisite thermal control which will enable the instrument to achieve its precision requirements. G-CLEF will complete its Critical Design phase in mid-2018. In this paper, we discuss the precision thermal control systems which enable milli-Kelvin-level stability of the spectrograph and its red and blue focal planes. The measurement electronics and thermal control strategies used in the spectrograph are described. Of particular importance is the development of a continuous LN2 flow cryo-cooler system used to maintain the focal planes at stable cryogenic operational temperatures. This system has been validated with a prototyping effort completed during the instrument’s design phase. We also review G-CLEF’s insulated enclosure which simultaneously maintains the spectrograph a stable temperature and limits the maximum thermal leakage into the telescope dome. This work has been supported by the GMTO Corporation, a non-profit organization operated on behalf of an international consortium of universities and institutions: Arizona State University, Astronomy Australia Ltd, the Australian National University, the Carnegie Institution for Science, Harvard University, the Korea Astronomy and Space Science Institute, the São Paulo Research Foundation, the Smithsonian Institution, the University of Texas at Austin, Texas AM University, the University of Arizona, and the University of Chicago.
GMT联盟大型地球探测器（G-CLEF）的光机设计
DOI：
10.1117/12.2313582
发表时间：
2018
期刊：
Proceedings of SPIE
影响因子：
--
作者：
Mueller, Mark A.;Szentgyorgyi, Andrew;Baldwin, Daniel;Ben-Ami, Sagi;Budynkiewicz, Jamie;Evans, Ian;Evans, Janet;Lopez-Morales, Mercedes;McCracken, Kenneth;McMuldroch, Stuart
通讯作者：
McMuldroch, Stuart