Design Of High Efficiency Charged Particle Detector And Analysis Of Its Detection Performance

The charged particle detector(CPD)is used to detect charged particles in the space.It can study space radiation environment,providing important guarantees for the flight safety of manned space flight;at the same time,it can also provide a basis for the negative and aging of the satellite device to avoid the loss of design or leakage design;It is also possible to detect the type and quantity of charged particles in space and provide early warning for natural disasters in space,etc.Hence,the research of the load particle detector is very important.This paper uses a plastic scintillator coupling silicon photoelectric tube(SiPM)to detect charged particles,in order to improve the detection efficiency of the detector,the main contents of the study include:1.To design probes and test systems.The focus is about the design of the probe,mainly including the composition of plastic scintillator,SiPM and its assembly.In order to improve the detection efficiency,the choice of scintillat is considered from the angle of radiation,luminous efficiency,and the opto device spectral match;the choice of optoelectronic devices is considered from the aspects of size,working voltage,gain and photon detection efficiency..And it briefly introduces the design of electronics and the construction of test system.2.To exploring the effects of temperature and bias on the gain of SiPM and design the temperature compensation system.By studying the response of the CPD on the radio source under different temperature and bias,we can explore the effect of temperature and bias on the SiPM.Experiments have shown that the higher the temperature,the smaller the gain of the SiPM;the higher the bias,the greater the gain of the SiPM.In order to avoid the impact of temperature changes in space operation on its performance,on the one hand,an external means is used to ensure the optimal operating temperature of the detector,on the other hand,based on the effect of temperature and bias on SiPM gain to design the temperature compensation system and to improve the performance of accuracy and detection efficiency of tapered particles detection at different temperatures.3.To study the detection performance of CPD on different particles.CPD is used to test different types of radiation sources,electron beams and proton beams to analyze their energy response,relationship between signal amplitude and energy(E-C),energy resolution and detection efficiency to different particles.The test results show that the CPD is optimally to electrons,and the detection efficiency can reach 100%;the response to the proton is second;the response to the gamma rays is the worst,and detection efficiency of γis less than 12.9%.Through experimental verification,the design of charged particle detector meets the application requirements of having higher detection efficiency for charged particles and lower detection efficiency for non-charged particles.