Trigger time acquisition system for ground based air shower experiments
Trigger time acquisition system for ground based air shower experiments
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DOI：
10.1016/j.nima.2022.166363
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
T. Ohura;M. Ohnishi;Y. Katayose
中科院分区：
文献类型：
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作者：
T. Ohura;M. Ohnishi;Y. Katayose
为了观测几TeV或更高的宇宙伽马射线，许多实验小组进行了地面气淋观测实验。新的项目，如安第斯大面积宇宙射线物理和天文学粒子探测器（ALPACA）也在进行中。在这些实验中，当观测到突发的宇宙现象时，需要一个精确的触发时间测量系统。为了记录这种突发的天文现象，我们开发了一个事件触发时间记录系统，可以准确地测量空气阵雨的到达时间。该系统由商用全球导航卫星系统模块、高精度时钟、具有精确时间测量复位功能的多命中型时间-数字转换器和安装在计算机上的网络时间协议服务器组成。与UTC相比，时间精度约为1 μ s，时间偏差约为11.4 ns，标准差为1。所开发的系统具有通用性，也可用于ALPACA实验。预计该系统的时间精度可提高到±40 ns左右。
For observations of cosmic gamma rays of several TeV or more, many experimental groups conduct ground-based air shower observation experiments. New projects such as Andes Large area PArticle detector for Cosmic ray physics and Astronomy (ALPACA) are also underway. In these experiments, an accurate trigger time measurement system is required when sudden cosmic phenomena are observed. To record such sudden astronomical phenomena, we have developed an event-trigger time recording system that accurately measures the arrival times of air showers. The system consists of a commercial global navigation satellite system module, a high-precision clock, a multi-hit type time-to-digital converter with a reset function for accurate time measurement, and a network-time-protocol server installed on a computer. It was confirmed that the time accuracy compared to UTC was approximately 1 μ s, and the time deviation was approximately 11.4 ns with one standard deviation. The developed system is versatile and can also be used for the ALPACA experiment. It is expected that the time accuracy of this system can be improved to approximately±40 ns.