Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
Cosmic ray oriented performance studies for the JEM-EUSO first level trigger
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DOI：
10.1016/j.nima.2017.05.043
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发表时间：
2017-09-11
影响因子：
1.4
通讯作者：
Marchi, A. Zuccaro
中科院分区：
文献类型：
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作者：
Abdellaoui, G.;Abe, S.;Marchi, A. Zuccaro
JEM-EUSO是一项旨在从国际空间站（ISS）调查超高能量宇宙射线和中微子（e> 5.10(19) eV）的太空任务。从上面往下看，它的广角望远镜能够观察到它们的空气阵雨，并从一个非常大的区域收集这些数据。在大气和人类活动相关的背景光存在的情况下，需要高度特定的触发算法来大幅减少数据负载，同时保留望远镜记录的罕见宇宙射线事件。我们报告了一级触发算法在离线测试中的性能，测试数据来自JEM-EUSO原型和观察不同光源的实验室测量数据：在加拿大高空气球飞行期间获得的数据，从地面观测到的穿越真实大气的激光脉冲，以及再现现实宽高比和从国际空间站本身看到的光线条件的模型景观。第一级触发逻辑成功地将触发率保持在允许范围内，当受到人工产生的以及自然遇到的夜空背景波动的挑战时，同时保留具有一般风淋特征的事件。(C) 2017 Elsevier B.V.版权所有
JEM-EUSO is a space mission designed to investigate Ultra-High Energy Cosmic Rays and Neutrinos (E > 5.10(19) eV) from the International Space Station (ISS). Looking down from above its wide angle telescope is able to observe their air showers and collect such data from a very wide area. Highly specific trigger algorithms are needed to drastically reduce the data load in the presence of both atmospheric and human activity related background light, yet retain the rare cosmic ray events recorded in the telescope. We report the performance in offline testing of the first level trigger algorithm on data from JEM-EUSO prototypes and laboratory measurements observing different light sources: data taken during a high altitude balloon flight over Canada, laser pulses observed from the ground traversing the real atmosphere, and model landscapes reproducing realistic aspect ratios and light conditions as would be seen from the ISS itself. The first level trigger logic successfully kept the trigger rate within the permissible bounds when challenged with artificially produced as well as naturally encountered night sky background fluctuations and while retaining events with general air-shower characteristics. (C) 2017 Elsevier B.V. All rights reserved.