Track Finding for the Level-1 Trigger of the CMS Experiment
Track Finding for the Level-1 Trigger of the CMS Experiment
复制标题
CMS 实验的 1 级触发器的轨迹查找
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
T. James
中科院分区：
文献类型：
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作者：
T. James
位于CERN的高亮度LHC（HL-LHC）正在为CMS实验开发一个新的跟踪系统。它包括一个硅跟踪器，将在两个紧密间隔的传感器层的集群相关，从低横向动量轨道的命中拒绝。这将允许跟踪器数据以40 MHz的频率读出到1级触发器。1级寻轨器必须能够在延迟限制内识别横向动量大于2-3（mathrm {GeV}/c）的磁道。提出了一种基于FPGA的航迹搜索器的概念，该航迹搜索器采用完全时分复用的结构，利用Hough变换识别航迹候选，然后用卡尔曼滤波器进行细化。这两个步骤都在FPGA固件中完全实现。由MP 7 MicroTCA处理卡构建的硬件系统已经组装好，它展示了一个真实的寻轨器切片，以帮助衡量最终系统的性能和要求。
A new tracking system is under development for the CMS experiment at the High Luminosity LHC (HL-LHC), located at CERN. It includes a silicon tracker that will correlate clusters in two closely spaced sensor layers, for the rejection of hits from low transverse momentum tracks. This will allow tracker data to be read out to the Level-1 trigger at 40 MHz. The Level-1 track-finder must be able to identify tracks with transverse momentum above 2–3 (mathrm {GeV}/c) within latency constraints. A concept for an FPGA-based track finder using a fully time-multiplexed architecture is presented, where track candidates are identified using a Hough Transform, and then refined with a Kalman Filter. Both steps are fully implemented in FPGA firmware. A hardware system built from MP7 MicroTCA processing cards has been assembled, which demonstrates a realistic slice of the track finder in order to help gauge the performance and requirements for a final system.