用于CBM-TOF超级模块质量评估的SoC数据读出方法

SoC Data Readout Method for CBM-TOF Super Module Quality Evaluation

在高压缩重子物质(Compressed Baryonic Matter,CBM)实验中,多气隙电阻板室(Multi-gap Resistive Plate Chamber,MRPC)探测器被用于构建飞行时间(Time of Flight,TOF)谱仪。根据CBM实验需求,TOF谱仪被设计成由6种不同类型的超级模块构成的探测器墙。每个模块最多包含5块MRPC探测器,能提供320路电子学通道,单个模块的数据率高达6 Gbps。为了评估CBM-TOF超级模块的性能,本文提出了一种基于TCP/IP千兆以太网技术的数据读出方法。考虑到TCP/IP协议的复杂性,该方法利用Altera SoC FPGA从前端电子学接受数字化的时间数据,并通过千兆以太网并行地发送数据到DAQ软件。实验室测试结果表明,单个读出扣板全链路读出速率达到550 Mbps,能够用于CBM-TOF MRPC探测器质量评估。

Several Multi-Gap Resistive Plate Chambers(MRPCs)was used to construct a Time of Flight(TOF)system in the Compressed Baryonic Matter(CBM)experiment.According to the requirements of the CBM experiment,the CBM-TOF wall is composed of 6 diffierent types of super module.Each module containsfive MRPC detectors,providing 320 electronic channels with data rates up to 6 Gbps for a single module.To evaluate the quality of CBM-TOF super module,in this paper,a data readout module based on Gigabit Ethernet technology was developed.The readout module accepts digitized time data from the front-end electronics using Altera SoC FPGAs and sends the data to the DAQ software in parallel via Gigabit Ethernet.Laboratory test results show that the overall data transfer rate of a single data transmission path can reach up to 550 Mbps,which can be used for CBM-TOF Super Module quality evaluation.