伽马空气表（GAW）：电子和触发器概念
Gamma Air Watch (GAW): the electronics and trigger concept
摘要：
GAW提出了一种新的方法来探测和测量GeV/TeV伽马射线穿过地球大气层产生的切伦科夫光，这对电子设计提出了具体要求。全球大气观察望远镜的焦面由多阳极光电倍增管矩阵组成。大量的有源通道（数量级为10^5）使其基本上成为具有高分辨率成像能力的大型UV敏感数码相机。由于大量通道，可用空间有限，需要紧凑的设计，焦面元件之间的距离最小。前端电子学使用单光电子计数技术来捕获切伦科夫光。数据采集基于自由运行数据采集方法。每台望远镜的自触发能力是通过在10 ns的时间范围内，在覆盖整个焦面的重叠触发区域内检测过量的活动像素来保证的。在本文中，我们描述了GAW电子学，以及触发器的概念和实现。
英文摘要：
GAW proposes a new approach for the detection and measurement of the Cherenkov light produced by GeV/TeV gamma rays traversing the Earth atmosphere which imposes specific requirements on the electronics design. The focal surface of the GAW telescope consists of a matrix of multi-anode photomultipliers. The large number of active channels (of the order of 10^5) makes it basically a large UV sensitive digital camera with high resolution imaging capability. The limited amount of space available, due to the large number of channels, requires a compact design with minimal distance between the elements of the focal surface. The front-end electronics uses the single photoelectron counting technique to capture the Cherenkov light. The data acquisition is based on free-running data taking method. Self-triggering capability for each telescope is assured by detecting an excess of active pixels, in a 10ns time frame, inside overlapping trigger areas covering the whole focal surface. In this paper we describe the GAW electronics, as well as the trigger concept and implementation.
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