Searching for charged lepton flavour violation with the Mu3e experiment -- Data Acquisition

通过 Mu3e 实验寻找带电轻子风味违规——数据采集

• 批准号: 460651552
• 负责人: Professor Dr. Niklaus Berger
• 金额: --
• 依托单位: Institut für Kernphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/460651552?language=en
• 关键词: Searching; charged; lepton; flavour; violation

The main goal of the Mu3e Phase I experiment is the search for the charged lepton flavour violating decay gamma -> e e e with a sensitivity of BR(gamma -> e e e) < 5 × 10−15 at 90% confidence level (CL), corresponding to a factor 200 improvement compared to the existing bound. In order to reach the Mu3e Phase I sensitivity goal, of order 10^8 muon decays per second have to be observed for about a year of data taking time. The resulting enormous data rates have to be transported out of the detector by the data acquisition (DAQ) system and reduced by a filter farm capable of reliably and efficiently identifying decays of interest. To this end we have developed a compact Field Programmable Gate Array (FPGA) and optical link based DAQ and a Graphics Processing Unit (GPU) based filter farm and data processing, reconstruction and selection algorithms tailored to the experiment. The DAQ project includes the construction of the Mu3e DAQ and filter farm, their commissioning and calibration as well as maintenance and operation, and the data analysis, both on-line in the filter farm and off-line.

Mu3e第一阶段实验的主要目标是寻找违反衰变γ -> e e e e的带电轻子风味，其灵敏度为BR(γ -> e e e) < 5 × 10−15，在90%置信水平（CL）下，与现有界相比，相应的提高了200倍。为了达到Mu3e第一阶段的灵敏度目标，必须在大约一年的数据消耗时间内观察到每秒10^8次μ子衰减。由此产生的巨大数据速率必须通过数据采集（DAQ）系统从检测器传输出来，并通过能够可靠有效地识别感兴趣的衰减的滤波器场来降低。为此，我们开发了一个紧凑的现场可编程门阵列（FPGA）和光链路为基础的DAQ和图形处理单元（GPU）为基础的滤波器场和数据处理，重建和选择算法量身定制的实验。数据采集项目包括Mu3e数据采集和过滤场的建设、调试、校准、维护和运行，以及过滤场在线和离线的数据分析。