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arXiv 0711.0938physics.ins-dethep-ex
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ATLAS一级触发器的宇宙射线调试

Commissioning of the ATLAS Level-1 Trigger with Cosmic Rays

Thilo Pauly

摘要:

欧洲核子研究中心大型强子对撞机上的ATLAS探测器将暴露在40兆赫的质子-质子碰撞中。设计了一个三级触发系统,以选择潜在的感兴趣的事件,并将输入速率降低到100-200 Hz。第一触发电平(LVL 1)在定制的电子设备中实现,第二和第三触发电平在软件中实现。基于热量计信息和专用μ子触发探测器中的命中,LVL 1决定由中央触发处理器做出,产生小于100 kHz的输出速率。在此阶段,触发决策的允许延迟小于2.5微秒。ATLAS现场的最终LVL 1触发系统的安装工作正在全面展开,将于今年晚些时候完成。我们提出了一个状态报告的主要组成部分的第一级触发器和现场调试的完整的触发链与宇宙射线μ子。

英文摘要:

The ATLAS detector at CERN's Large Hadron Collider will be exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system was designed to select potentially interesting events and reduce the incoming rate to 100-200 Hz. The first trigger level (LVL1) is implemented in custom-built electronics, the second and third trigger levels are realized in software. Based on calorimeter information and hits in dedicated muon-trigger detectors, the LVL1 decision is made by the central-trigger processor yielding an output rate of less than 100 kHz. The allowed latency for the trigger decision at this stage is less than 2.5 microseconds. Installation of the final LVL1 trigger system at the ATLAS site is in full swing, to be completed later this year. We present a status report of the main components of the first-level trigger and the in-situ commissioning of the full trigger chain with cosmic-ray muons.

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