Research On Particle Detector System Based On "Semi-Physical Simulation"

In order to meet the increasing and increasing requirements of modern large accelerators on data acquisition system,a design of trigger-less data acquisition system is proposed.In order to verify the stability of the trigger-less data acquisition system,particle detector system based on “semi-physical simulation” is designed to generate a similar electrical signals for detectors to verify.After the verification is passed,the reliability of the trigger-less data acquisition system can be guaranteed to a certain degree,and it can be taken to the accelerator for real test.The particle detector system based on "semi-physical Simulation" designed in this thesis tests the trigger-less data acquisition system relative to the construction of a real detector system.It has the advantages of being able to conveniently generate various types of particle signals to verify and test the functionality and stability of the system.It has the advantages of economy and convenience,and saves precious accelerator beams.The most important point is to provide a new test method for the trigger-less data acquisition system.The first chapter introduces the background and significance of designing the particle detector system,summarizes why the particle detector system is needed and what functions it can accomplish,and gives the current situation of the semi-physical simulation platform industry.The second chapter discusses the overall design of the semi-physical simulation platform.The software part is the data source generated in Geant 4 and transmitted through the TCP channel.The Qt upper computer software receives the data and draws the signal image.The firmware part receives the communication frame and transmits the data in chip for the program loaded in FPGA.The third chapter discusses the software and the transmission data frame design.The source data is generated by Geant 4 software.The physical model,detector structure material,TCP transmission channel construction and custom macro command are programmed.In order to ensure the stability and accuracy of data transmission,TCP/IP transmission protocol is selected to transmit data.Qt upper computer software is designed to better control Geant 4 software and display detector energy deposition image,which is very convenient for comparison and verification with oscilloscope analog signal image.The fourth chapter discusses the hardware board card based on FPGA and the development of firmware applied in FPGA.Three IP cores of Processing System,DMA and DAC are fixed in FPGA.The energy deposition data is transmitted by AXI bus among the three IP cores.Data transfer is controlled by the firmware program of the PS core.When the Lwip server receives the data,the AXI bus transmits the signal data at the same time,which has very efficient transmission efficiency.In chapter 5,the experiment of particle detector system is introduced.In order to better accord with the spectral signal emitted by scintillator detector,the original data is processed by data filling algorithm.The digital signal of Qt upper computer software is compared with the analog signal of oscilloscope to verify the stability and accuracy of the particle detector system and reflect the real working process of the system.Chapter six summarizes all the work of the particle detector system based on“semi-physical simulation” and proposes the expectation of the system in the future.