Research On The Performance Of Nuclear Track Detectors And Its Preliminary Application In Laser Nuclear Physics

With the development of laser technology,the interdisciplinary research of laser application and other disciplines has gradually become the international frontier research trend.Laser nuclear physics is one of the international frontier research subjects.On the one hand,it is the only technical means in the laboratory to use laser to produce extreme plasma environment in celestial bodies.Generally,there are two types of ions to be detected in laser-driven nuclear reaction physics experiments: one is to measure the spatial distribution of the energy,density,and state of the accelerated ion beam generated by the laser focusing target,that is,the state information of the plasma.The other is to measure the information of ions generated in the nuclear reaction caused by intense laser target.The basic principle of measurement of the products of nuclear reaction can be used in laser nuclear astrophysics,but there are many difficulties in this.This article uses solid track detectors for the measurement of laser nuclear reactions.Solid track detectors have unique advantages.They have the ability to count single particles.They can identify charges and determine the energy of ions,and measure their angular distribution in experiments.When the energy is greater than 100 ke V,the efficiency of the CR-39 track detector is close to 100%,and the energy threshold can reach about 20 ke V.In this paper,the performance of CR-39 track detector is studied,and the preliminary results are applied to the experiments of laser nuclear physics.The details are as follows:1.The advantages and disadvantages of various methods for calibration of CR39 proton energy are discussed and compared in detail.The Rutherford backscatter formula is derived,the basic principle of the magnetic spectrometer is introduced,and the advantages and disadvantages of the two calibration schemes we used are shown.2.The performance parameters of the track detector are studied comprehensively,including a new method to calculate the relevant important parameters of the detector,the application range of the traditional measurement method is pointed out for the first time,and it is compared with the relevant experiments,with a high degree of agreement.3.For the first time,a new method to calculate the track etching rate is provided.4.It is the first time to provide an analytical expression to solve the international dispute over the response curve of the detector for low energy protons,and the agreement between the theory and the experimental results is shown in this paper.5.The results of its calibration were initially used in the measurement of laser nuclear reaction completed by the Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,and a better etching time and ion identification method were recommended.