The alignment and assembly of the DESI prime focus corrector
The alignment and assembly of the DESI prime focus corrector
复制标题
DESI定焦校正器的对准和组装
DOI：
10.1117/12.2232489
复制
发表时间：
2016
影响因子：
3.5
通讯作者：
A. Stefanik
中科院分区：
文献类型：
--
作者：
D. Brooks;P. Doel;R. Besuner;B. Flaugher;G. Gallo;G. Gutiérrez;S. Kent;M. Lampton;M. Levi;M. Liang;T. Miller;D. Sprayberry;A. Stefanik
目前正在建造的暗能量光谱仪(DESI)旨在利用重子声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4,000万个星系的光谱。KPNO Mayall望远镜的一个新的主焦点校正器将向5000个光纤定位器提供光。这些纤维依次供给十台宽带光谱仪。DESI的主焦校正器由六个镜头组成，直径从0.80-1.14米不等，重量从83-237公斤不等。光学校正器的大透镜的对准是一个巨大的挑战，因为为了满足光纤吞吐量要求，它们必须在~50微米的公差内对准。本文详细介绍了容纳透镜的电池的设计，以及将透镜安装到电池中并安装到完整桶组件中的对准和组装过程。这是基于由同一小组成功组装和校准的暗能量相机(DECAM)仪器的校准所获得的经验，我们在文件中介绍了将在DESI系统上实施的经验教训和设计修改。
The Dark Energy Spectroscopic Instrument (DESI), which is currently under construction, is designed to measure the expansion history of the Universe using the Baryon Acoustic Oscillation technique. The spectra of 40 million galaxies over 14000 sq deg will be measured during the life of the experiment. A new prime focus corrector for the KPNO Mayall telescope will deliver light to 5000 fibre optic positioners. The fibres in turn feed ten broad-band spectrographs. The prime focus corrector for DESI consists of six lenses that range in diameter from 0.80 - 1.14 meters and from 83 - 237 kg in weight. The alignment of the large lenses of the optical corrector poses a significant challenge as in order to meet the fibre throughput requirements they have to be aligned to within a tolerance of ~50 micrometres. This paper details the design for the cells that will hold the lenses and the alignment and assembly procedure for the mounting of the lenses into the cells and into the complete barrel assembly. This is based on the experience obtained from the alignment of the Dark Energy Camera (DECam) instrument which was successfully assembled and aligned by the same team and we include in the paper the lessons learnt and design modifications that will be implemented on the DESI system.