Installation of the Dark Energy Spectroscopic Instrument at the Mayall 4-meter telescope
Installation of the Dark Energy Spectroscopic Instrument at the Mayall 4-meter telescope
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Mayall 4米望远镜安装暗能量光谱仪
DOI：
10.1117/12.2561507
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Besuner R
中科院分区：
文献类型：
--
作者：
Besuner R
暗能量光谱仪（DESI）是第四阶段的地基暗能量实验，将使用重子声学振荡技术测量宇宙的膨胀历史。在实验期间，将测量超过14000平方度的3500万个星系和类星体的光谱。我们描述了在2019年底完成的Mayall 4m望远镜上安装仪器的主要元件。之前的主聚焦校正器、蜘蛛叶片和上环被从Mayall的Serrurier桁架中移除，取而代之的是新建造的DESI环、叶片、笼、六足和光学校正器。使用激光跟踪系统将新的校正器与主镜光学对准。DESI焦平面系统集成到校正器中，其10个500光纤定位器瓣段中的每一个都使用定制安装硬件和激光跟踪仪安装。10台DESI光谱仪和30个低温恒温器安装在大Coude室新组装的洁净室中。从焦平面的定位器中携带5000根光纤的10根电缆通过十角和小时角轴上的电缆缠绕而沿着望远镜向下布线，它们的整体滑动头与10台光谱仪集成在一起。光纤视图摄像机组件安装在Mayall的主镜单元上。仪器控制系统的服务器取代了现有的计算机设备。完全集成的仪器已经投入使用，准备开始运行阶段。
The Dark Energy Spectroscopic Instrument (DESI) is a Stage IV ground-based dark energy experiment that will measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 35 million galaxies and quasars over 14000 square degrees will be measured during the life of the experiment. We describe the installation of the major elements of the instrument at the Mayall 4m telescope, completed in late 2019. The previous prime focus corrector, spider vanes, and upper rings were removed from the Mayall’s Serrurier truss and replaced with the newlyconstructed DESI ring, vanes, cage, hexapod, and optical corrector. The new corrector was optically aligned with the primary mirror using a laser tracker system. The DESI focal plane system was integrated to the corrector, with each of its ten 500-fiber-positioner petal segments installed using custom installation hardware and the laser tracker. Ten DESI spectrographs with 30 cryostats were installed in a newly assembled clean room in the Large Coude Room. The ten cables carrying 5000 optical fibers from the positioners in the focal plane were routed down the telescope through cable wraps at the declination and hour angle axes, and their integral slitheads were integrated with the ten spectrographs. The fiber view camera assembly was installed to the Mayall’s primary mirror cell. Servers for the instrument control system replaced existing computer equipment. The fully integrated instrument has been commissioned and is ready to start its operations phase.
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DOI：
10.1117/12.2232978
发表时间：
2016
期刊：
Journal of Astronomical Telescopes, Instruments, and Systems
影响因子：
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作者：
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DOI：
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发表时间：
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期刊：
Ground-based and Airborne Telescopes VII
影响因子：
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作者：
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