SST dual-mirror telescope for Cherenkov Telescope Array: an innovative mirror manufacturing process
SST dual-mirror telescope for Cherenkov Telescope Array: an innovative mirror manufacturing process
复制标题
用于切伦科夫望远镜阵列的 SST 双镜望远镜：创新的镜面制造工艺
DOI：
10.1117/12.2055077
复制
发表时间：
2014
影响因子：
1.1
通讯作者：
B. Peyaud
中科院分区：
文献类型：
--
作者：
D. Dumas;J. Huet;J. Dournaux;P. Laporte;C. Rulten;J. Schmoll;H. Sol;F. Sayede;P. Micolon;J. Glicenstein;B. Peyaud
巴黎天文台正在为切伦科夫望远镜阵列 (CTA) 建造一个小型望远镜 (SST) 原型，名为 SST-GATE，基于双镜 Schwarzschild-Couder 光学设计。考虑到镜子的尺寸及其特定曲率以及切伦科夫成像望远镜的光学要求，SST-GATE原型的镜子采用了非常规工艺进行设计和制造。基于铝块样品的加工、抛光和涂层，该过程已通过模拟和测试得到验证，本文将在讨论迄今为止从未用于设计地面望远镜的 Schwarzschild-Couder 光学设计后详细介绍这些过程。即使SST-GATE是CTA阵列小尺寸望远镜的原型，望远镜的主镜直径为4米，而且必须分段。由于采用双镜配置，对准是一项复杂的任务，需要一个定义明确且精确的过程，这将在本文中讨论。
The Observatoire de Paris is constructing a prototype Small-Sized Telescope (SST) for the Cherenkov Telescope Array (CTA), named SST-GATE, based on the dual-mirror Schwarzschild-Couder optical design. Considering the mirrors size and its specific curvature and the optical requirements for the Cherenkov imaging telescope, a non-conventional process has been used for designing and manufacturing the mirrors of the SST-GATE prototype. Based on machining, polishing and coating of aluminium bulk samples, this process has been validated by simulation and tests that will be detailed in this paper after a discussion on the Schwarzschild-Couder optical design which so far has never been used to design ground based telescopes. Even if the SST-GATE is a prototype for small size telescopes of the CTA array, the primary mirror of the telescope is 4 meters diameter, and it has to be segmented. Due to the dual-mirror configuration, the alignment is a complex task that needs a well defined and precise process that will be discussed in this paper.