标题： 赫斯相位2望远镜的拓扑二级触发器 显示英文标题

标题： The topological second-level trigger of the H.E.S.S. phase 2 telescope

摘要： H.E.S.S 是一个大气切连科夫望远镜阵列，专门用于GeV-TeV伽马射线天文学。 原始阵列自2004年初开始运行。 它由四个直径12米的望远镜组成。 正在安装第五个直径28米的望远镜。 该望远镜将同时在立体模式和单目模式下运行，即不依赖于较小望远镜的同时探测。 当在单目模式下运行时，需要一个二级触发系统来抑制28米望远镜的虚假触发。 本文给出了二级触发的动机和原理。 通过一个示例算法说明了其工作原理。 描述了H.E.S.S第二阶段二级触发系统的硬件实现，并评估了其预期性能。 显示英文摘要

摘要： H.E.S.S is an array of atmospheric Cherenkov telescopes dedicated to GeV-TeV gamma-ray astronomy. The original array has been in operation since the beginning of 2004. It is composed of four 12-meter diameter telescopes. The installation of a fifth 28-meter diameter telescope is being completed. This telescope will operate both in stereoscopic mode and in monoscopic mode i.e. without a coincident detection on the smaller telescopes. A second-level trigger system is needed to supress spurious triggers of the 28-meter telescope when operated in monoscopic mode. This paper gives the motivation and principle of the second-level trigger. The principle of operation is illustrated by an example algorithm. The hardware implementation of the second level trigger system of H.E.S.S. phase 2 is described and its expected performances are then evaluated.