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The ATLAS Level-1 topological processor: Experience and upgrade plans
International Journal of Modern Physics A ( IF 1.6 ) Pub Date : 2020-12-23 , DOI: 10.1142/s0217751x2044008x
Carlos Moreno Martínez 1
Affiliation  

During Run 2 (2015–2018) the Large Hadron Collider has provided, at the World’s highest energy frontier, proton–proton collisions to the ATLAS experiment with high instantaneous luminosity (up to [Formula: see text]), placing stringent operational and physics requirements on the ATLAS trigger system in order to reduce the 40 MHz collision rate to a manageable event storage rate of 1 kHz, while not rejecting interesting collisions. The Level-1 trigger is the first rate-reducing step in the ATLAS trigger system with an output rate of up to 100 kHz and decision latency of less than 2.5 [Formula: see text]s. In Run 2, an important role was played by the Level-1 Topological Processor (L1Topo). This innovative system consists of two blades designed in AdvancedTCA form factor, mounting four individual state-of-the-art processors, and providing high input bandwidth and low latency data processing. Up to 128 topological trigger algorithms can be implemented to select interesting events by applying kinematic and angular requirements on electromagnetic clusters, hadronic jets, muons and total energy reconstructed in the ATLAS apparatus. This resulted in a significantly improved background rejection and enhanced acceptance of physics signal events, despite the increasing luminosity. The L1Topo system has become more and more important for physics analyses making use of low energy objects, commonly present in the Heavy Flavor or Higgs physics events, for example. An overview of the L1Topo architecture, simulation and performance results during Run 2 is presented alongside with upgrade plans for the L1Topo system to be installed for the future Run 3 data taking period.

中文翻译:

ATLAS Level-1 拓扑处理器:体验与升级计划

在运行 2(2015-2018 年)期间,大型强子对撞机在世界最高能量前沿为 ATLAS 实验提供了具有高瞬时光度(高达 [公式:见文本])的质子-质子碰撞,将严格的操作和物理对 ATLAS 触发系统的要求,以便将 40 MHz 冲突率降低到 1 kHz 的可管理事件存储率,同时不拒绝有趣的冲突。Level-1 触发器是 ATLAS 触发器系统中的第一个降速步骤,输出速率高达 100 kHz,判决延迟小于 2.5 [公式:见文本]s。在 Run 2 中,Level-1 拓扑处理器 (L1Topo) 发挥了重要作用。这个创新系统由两个采用 AdvancedTCA 外形设计的刀片组成,安装了四个独立的最先进的处理器,并提供高输入带宽和低延迟数据处理。可以实现多达 128 种拓扑触发算法,通过对 ATLAS 设备中重建的电磁团、强子射流、μ子和总能量应用运动学和角度要求来选择感兴趣的事件。尽管亮度增加,这导致了显着改善的背景抑制和增强的物理信号事件接受度。L1Topo 系统对于利用低能量物体的物理分析变得越来越重要,例如,通常出现在重味或希格斯物理事件中。概述了 Run 2 期间的 L1Topo 架构、仿真和性能结果,以及为未来 Run 3 数据采集期间安装的 L1Topo 系统的升级计划。
更新日期:2020-12-23
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