Experimental Study On The Spatial Interaction Mechanism Of Ultraviolet Light And High-energy Track Detection

Particle physics is a discipline that studies the properties and interactions of the fundamental particles that constitute the material world.It is also one of the hottest and most cutting-edge fields in physics today.In recent years,with the development of particle physics,in order to systematically study the properties of the Higgs boson,And search for new physics beyond the standard model,China has proposed the plan to build the Circular Electron Positron Collider（CEPC）.As a next-generation large-scale particle collider on the international stage,it imposes high requirements on the performance of its accompanying detectors.Among them,the Time Projection Chamber（TPC）serves as a crucial option for the main tracking detector,with a position resolution requirement of 100μm.To meet this requirement,the CEPC-TPC research group has carried out a series of prototype development and key technology research.In gas detectors,positive ions generated by charged particles after multiplication will flow back into the sensitive region of the detector,causing distortions in the particle tracks.In order to investigate this problem in depth,it is necessary to first generate a sufficient,stable,and uniformly distributed population of primary electrons within the effective area of the detector through experiments.This article is based on the key research problem and conducts a detailed investigation to analyze the spatial interaction mechanism between ultraviolet（UV）light and the detector.It is found that UV light can generate ionization reactions through the mechanisms of photoelectric effect and two-photon ionization.The article innovatively proposes the"UV light-to-electron conversion"technique to conduct experiments and achieve stable and sufficient current output.The article first analyzes the key research challenges and simulates the density of amplified positive ions and primary electrons generated inside the time projection chamber,providing the crucial parameters for the experiments.Furthermore,an experimental platform is constructed according to the experimental requirements,and software capable of continuously measuring current at the picoampere level is developed using high-precision electrostatic meters.This effectively solves the problem of generating and measuring primary electrons.Ultimately,the use of aluminum material polished with 1400-grit sandpaper enables the generation of the maximum number of primary electrons,with a current density of 780A·cm^-2,which is consistent with the simulation results.In addition,this experimental method effectively verifies the issue of uniform distribution of primary electrons,achieving a current uniformity of over 96%,thus addressing and meeting the parameter requirements of high-energy physics experiments.This article conducts a study on the interaction mechanism between ultraviolet（UV）light and gas detectors,and utilizes the UV light-to-electron conversion method to generate a large number of primary electrons.The process is further simulated using specialized simulation software,and the results of the simulation align with the experimental measurements.This work provides crucial physical and experimental foundations for the research on the prototype of the time projection chamber.