论文标题
MU3E DAQ中的数据流
Data Flow in the Mu3e DAQ
论文作者
论文摘要
Paul Scherrer Institute（PSI）的MU3E实验搜索了违反的Lepton风味损失$μ^+ \ rightarrow E^+ E^+ E^+ E^ - $。该实验的目的是使$ 10^{16} $ $ $ $ $ $衰减的最终灵敏度。 The first phase of the experiment, currently under construction, will reach a branching ratio sensitivity of $2\cdot10^{-15}$ by observing $10^{8}$ $μ$ decays per second over a year of data taking.基于薄的高压单层活性像素传感器（HV-MAP）和闪烁的时正时探测器的高度颗粒状检测器将以这些粒子速率产生约100 GB/s的数据。 基于字段可编程阵列的MU3E数据采集系统（DAQ）将读取不同的检测器零件。无触发的读数系统用于在运行时对数据进行排序，时间对齐和分析。配备强大图形处理单元（GPU）的PC农场将执行事件重建和减少数据。 该论文介绍了子检测器持续的集成到DAQ中，尤其是关注滤清器农场FPGA内部的时间对齐和数据流。它还将显示在2021年和2022年春季进行的MU3E集成运行中使用的DAQ系统。
The Mu3e experiment at the Paul Scherrer Institute (PSI) searches for the charged lepton flavour violating decay $μ^+ \rightarrow e^+ e^+ e^-$. The experiment aims for an ultimate sensitivity of one in $10^{16}$ $μ$ decays. The first phase of the experiment, currently under construction, will reach a branching ratio sensitivity of $2\cdot10^{-15}$ by observing $10^{8}$ $μ$ decays per second over a year of data taking. The highly granular detector based on thin high-voltage monolithic active pixel sensors (HV-MAPS) and scintillating timing detectors will produce about 100 GB/s of data at these particle rates. The Field Programmable Gate Array based Mu3e Data Acquisition System (DAQ) will read out the different detector parts. The trigger-less readout system is used to sort, time align and analyze the data while running. A farm of PCs equipped with powerful graphics processing units (GPUs) will perform the event reconstruction and data reduction. The paper presents the ongoing integration of the sub detectors into the DAQ, especially focusing on the time aligning and the data flow inside the FPGAs of the filter farm. It will also show the DAQ system used in the Mu3e Integration Runs performed in spring 2021 and 2022.
