论文标题
运行2中Atlas触发系统的操作
Operation of the ATLAS trigger system in Run 2
论文作者
论文摘要
大型强子对撞机的Atlas实验采用了两级触发系统，以物理碰撞的平均速率记录数据，从初始束越过40 MHz开始。在LHC Run 2（2015-2018）中，Atlas Trigger系统通过适应遇到的各种运行条件而成功运行，具有出色的性能和灵活性，并且对于Atlas Run-2 Physics计划至关重要。对于质子 - 普罗顿运行，触发菜单中包括大约1500个单独的事件选择，该菜单指定了用于数据捕获的物理特征和选择算法，以及分配的事件速率和带宽。触发菜单必须考虑到LHC的瞬时发光度以及Atlas检测器读数，在线处理农场和离线存储中的限制，因此必须反映给定数据收集期的物理目标。本文档讨论了在运行2中标称质子 - 普罗顿数据收集期间Atlas触发系统的操作，其中包含特殊的数据运行示例。介绍了软件验证的各个方面，在运行2期间触发选择算法的演变，触发系统的监视以及数据质量以及触发配置。
The ATLAS experiment at the Large Hadron Collider employs a two-level trigger system to record data at an average rate of 1 kHz from physics collisions, starting from an initial bunch crossing rate of 40 MHz. During the LHC Run 2 (2015-2018), the ATLAS trigger system operated successfully with excellent performance and flexibility by adapting to the various run conditions encountered and has been vital for the ATLAS Run-2 physics programme. For proton-proton running, approximately 1500 individual event selections were included in a trigger menu which specified the physics signatures and selection algorithms used for the data-taking, and the allocated event rate and bandwidth. The trigger menu must reflect the physics goals for a given data collection period, taking into account the instantaneous luminosity of the LHC and limitations from the ATLAS detector readout, online processing farm, and offline storage. This document discusses the operation of the ATLAS trigger system during the nominal proton-proton data collection in Run 2 with examples of special data-taking runs. Aspects of software validation, evolution of the trigger selection algorithms during Run 2, monitoring of the trigger system and data quality as well as trigger configuration are presented.
