Development Of A Cosmic Ray Calibration System Based On A Drift Chamber

Obtaining the position information of particles is of great importance in the research and application fields of nuclear physics,particle physics,and nuclear medicine,which has led to the development of various types of position-sensitive detectors.Position resolution and detection efficiency are two important performance indicators of position sensitive detectors,and these two indicators generally require position calibration systems for scaling.In order to meet the needs of position resolution scaling and detection efficiency scaling of position sensitive detectors with different sensitivity areas,a cosmic ray calibration system with a drift chamber as the core detector is developed in this work,which is expected to achieve the goals of high detection efficiency,high position resolution and convenient operation of cosmic rays.The main contents of this thesis are:(1)Complete the electrostatic field simulation of the multifilament drift chamber and its edge effect analysis,which can enable us to better understand and master the working principle of the detector and give guidance in the design and sizing of the detector.(2)Complete the construction,testing and data analysis of the cosmic ray calibration system with small sensitive area filaments perpendicular to each other,including drift chamber configuration,testing electronics AGET,iron source energy spectrum and cosmic ray testing,processing and analysis of cosmic ray test data.The data processing part contains the processing inspection of the data package,the generalized Gaussian function fitting method to extract the time information and the solution of the trigger wobble problem,the RT curve simulation and correction algorithm,the tracing and trail reconstruction algorithm,the position scaling and result analysis,and the introduction of the data processing framework.The position resolution of the calibration system is 92%,and the position resolution of the calibration system is characterized by the trace residuals.The position resolution of cosmic rays passing through the calibration system is 353.1μm at 4 layers,473.5 μm at 5 layers,and 463.9 μm at 6 layers,and the position resolution of the calibration system is 332 μm under certain circumstances due to the special characteristics of the calibration system.The processing method of the cosmic ray experimental data and the frame replacement trail reconstruction method can be directly applied to the cosmic ray calibration system of large sensitive area.(3)The design and fabrication of the cosmic ray calibration system with a large sensitive area containing oblique filaments,the iron source energy spectrum test,and the path simulation and path reconstruction of the incident cosmic rays based on its configuration were completed,and the 2D path and 3D path reconstruction algorithms were developed.The cosmic ray calibration system will provide an open platform for position resolution scaling and detection efficiency scaling for both internal and external users.