Experimental Studies On Physical Mechanism Of The Gasous Detector With UV Laser

In recent years,with the development of high energy physics experiments,as the important option of the core track detector,international demand for gas track detection becomes higher.Time Projection Chamber(TPC)is also facing new challenges.In order to meet the demand of high position accuracy(?100 ?m),not only the corresponding detection technology should be developed,but also the calibration of laser system should be considered.As a new testing method,UV laser simulation of specific track has been applied in STAR and ALICE TPC group.For the basic physical mechanism of UV gasous detector with UV laser,there are still many works that have not been carried out in depth.This thesis conducts the experimental researches on the interaction between UV laser and gas with single and multi-beam laser testing equipment.Firstly,this thesis analyzes the physical mechanism of the interaction between UV laser and gas.Combined with the stability and ionization ability of UV laser,the feasibility of laser application in TPC research is demonstrated.The main factors affecting the accuracy of TPC are simulated and the influence of dynamic parameters on the electron drift velocity in TPC is given.The energy stability and directional stability of the UV laser beam are studied by using a single beam laser testing device,which gives the experimental verification of the UV laser used in the track detector.The interaction mechanism experiment of 266 nm UV laser with different working gas is designed,and the ionization ability of laser is tested.The quantitative analysis results of the ionization ability of UV laser and working gas are given.By comparing with the working gas of LCTPC and other international cooperation groups,it provides important reference for selecting gas and energy for UV laser application in TPC research.The significant results of the experimental study of UV laser provide references for the application of 266 nm UV laser in high-precision time projection chamber technology,including experimental measurement of laser ionization and drift velocity of the electron,which are tested by single beam and multi-beam laser device respectively.