An FPGA based track finder for the L1 trigger of the CMS experiment at the High Luminosity LHC
An FPGA based track finder for the L1 trigger of the CMS experiment at the High Luminosity LHC
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DOI：
10.1088/1748-0221/12/12/p12019
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发表时间：
2017-12-01
影响因子：
1.3
通讯作者：
Weber, M.
中科院分区：
文献类型：
--
作者：
Aggleton, R.;Ardila-Perez, L. E.;Weber, M.
一种新的跟踪探测器正在研制中，用于高亮度LHC （HL-LHC）的CMS实验。这次升级的一个关键要求是能够在4 μ s内重建横向动量在2-3 GeV以上的所有带电粒子轨迹，以便它们可以用于一级触发决策。提出了一种基于fpga的航迹探测器的概念，该航迹探测器采用全时复用架构，其中候选航迹通过基于霍夫变换的投影分形算法重建，然后采用组合卡尔曼滤波。使用MP7处理板的硬件演示器已经组装，以证明整个系统的功能，从跟踪器读出板的输出到具有合适螺旋参数的轨道重建。它一次成功地在跟踪器立体角接受的八分之一上运行，处理40 MHz的事件，每个事件平均有多达200个叠加质子-质子相互作用，同时满足延迟要求。将讨论所演示的轨道重建系统、所选择的体系结构、迄今取得的成就以及这种系统的未来选择。
A new tracking detector is under development for use by the CMS experiment at the High-Luminosity LHC (HL-LHC). A crucial requirement of this upgrade is to provide the ability to reconstruct all charged particle tracks with transverse momentum above 2-3 GeV within 4 mu s so they can be used in the Level-1 trigger decision. A concept for an FPGA-based track finder using a fully time-multiplexed architecture is presented, where track candidates are reconstructed using a projective binning algorithm based on the Hough Transform, followed by a combinatorial Kalman Filter. Ahardware demonstrator using MP7 processing boards has been assembled to prove the entire system functionality, from the output of the tracker readout boards to the reconstruction of tracks with fitted helix parameters. It successfully operates on one eighth of the tracker solid angle acceptance at a time, processing events taken at 40 MHz, each with up to an average of 200 superimposed proton-proton interactions, whilst satisfying the latency requirement. The demonstrated track-reconstruction system, the chosen architecture, the achievements to date and future options for such a system will be discussed.