The inside-out, upside-down telescope: the Argus Array’s new pseudofocal design

The inside-out, upside-down telescope: the Argus Array’s new pseudofocal design
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由内而外、上下颠倒的望远镜:阿格斯阵列的全新伪焦设计

DOI:
10.1117/12.2630037
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发表时间:
2022
期刊:
Ground-based and Airborne Telescopes IX
影响因子:
--
通讯作者:
Walters, Glenn
Walters, Glenn
中科院分区:
--
文献类型:
--
作者:
Law, Nicholas M.;Vasquez Soto, Alan;Corbett, Hank;Galliher, Nathan W.;Gonzalez, Ramses;Machia, Lawrence;Walters, Glenn

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Argus光学阵列将是第一个全天空、角秒分辨率、5米级望远镜。目前正在制作原型的55 GPix阵列将由900个望远镜组成,其中61个MPix极低噪声CMOS探测器能够实现亚秒级的节奏。阿古斯将每晚观测北方天空的每一部分6-12小时,同时实现高节奏和深空观测。该阵列将建立一个双色,百万纪元的电影,达到黑暗的天空深度mg =19.6每分钟和mg =23.6每星期超过整个天空的47%,使最敏感的搜索高速瞬变,引力波对应物,系外行星微透镜事件,和一系列其他现象。在本文中,我们提出了我们新开发的阵列安排,它安装到一个半球形碗(把原来的圆顶设计内翻)的内部所有望远镜。因此,望远镜的光束会聚在一个单一的“伪焦点”上。当沿着望远镜的极轴放置时,这一点不会随着望远镜的轨迹而移动,这使得每台望远镜都可以同时通过一个固定外壳中的单一固定窗口进行观察。这个望远镜碗悬挂在一个简单的自由摆动枢轴上(将通常的望远镜安装支架倒置),通过创建由第二个安装枢轴定义的虚拟极轴来实现极对准。这种新设计目前正在使用38望远镜的Argus Pathfinder进行原型设计,消除了对可移动外部圆顶的需要,从而大大降低了整个Argus阵列的成本和复杂性。再加上仔细的软件范围控制和现有软件管道的使用,Argus阵列可能因此成为中等规模预算内最深和最快的天空调查之一。
The Argus Optical Array will be the first all-sky, arcsecond-resolution, 5-m class telescope. The 55 GPix Array, currently being prototyped, will consist of 900 telescopes with 61 MPix very-low-noise CMOS detectors enabling sub-second cadences. Argus will observe every part of the northern sky for 6-12 hours per night, achieving a simultaneously high-cadence and deep-sky survey. The array will build a two-color, million-epoch movie, reaching dark-sky depths ofmg=19.6 each minute andmg=23.6 each week over 47% of the entire sky, enabling the most-sensitive-yet searches for high-speed transients, gravitational-wave counterparts, exoplanet microlensing events, and a host of other phenomena. In this paper we present our newly-developed array arrangement, which mounts all telescopes into the inside of a hemispherical bowl (turning the original dome design inside-out). The telescopes’ beams thus converge at a single “pseudofocal” point. When placed along the telescope’s polar axis, this point does not move as the telescope tracks, allowing every telescope to simultaneously look through a single, unmoving window in a fixed enclosure. This telescope bowl is suspended from a simple free-swinging pivot (turning the usual telescope mounting support upside-down), with polar alignment afforded by the creation of a virtual polar axis defined by a second mounting pivot. This new design, currently being prototyped with the 38-telescope Argus Pathfinder, eliminates the need for a movable external dome and thus greatly reduces the cost and complexity of the full Argus Array. Coupled with careful software scope control and the use of existing software pipelines, the Argus Array could thus become one of the deepest and fastest sky surveys, within a midscale-level budget.
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