Prediction Of Neutron Induced Single Event Effect Based On GEANT4

The development of electronic devices has been promoting progress in national military and social life in various fields.Especially the aerospace devices,they are a more important basic component.However,there are a large number of particles(neutrons,protons,etc.)and cosmic rays distributed in the space radiation environment,and the operation of the components will be affected by them.When these particles enter into the device,they will react with them in a certain probability and make a single event effect.In the near space of the earth,the particles are divided into three categories:neutrons,protons,and electron.The proportion of the neutron is close to 50%,and its radiation influence is larger.In recent years,it has been proved that the cross section of single proton in the energy section below 2MeV is far higher than that of other energy section,but there is not much study on the MBU in this energy section.At the same time,as the arrival of nanoscale technology,the device is more sensitive to the SEE,in which the multi bit upset becomes easier to happen,but the prediction model of multi bit upset which can be used in the advanced technology is still less in the computer simulation.This dissertation mainly studies the multi bit upset in single event effect.Based on the GEANT4 software,a new multi sensitive volume prediction model is established,which can detect multi bit upset.The SEU of the radiation particles(neutron and the proton with energy below 2MeV)is simulated and predicted under the 40nm technology,and the cross section of MBU under various incident conditions is calculated.The main tasks are as follows:1)Building a compound sensitive volume model with GEANT4 software and simulating the radiation of neutrons and heavy ions.The saturated upset cross section of the radiation results of heavy ion is different from the actual measurement result by 3.5%,the difference between the threshold of LET and the TCAD simulation result is 3%;and the upset cross section of neutron in each energy section is approximately consistent with the literature data.2)Based on the compound sensitive volume model,a multi sensitive volume prediction model is established to predict the single event effect of neutrons.The SBU and MBU ratios of neutron radiation below 20MeV energy are predicted,and the results are consistent with the literature data.Simulating the radiation of heavy ion,the saturated cross section and LET threshold prediction of 2-bit upset,3-bit upset,4-bit upset are given from Weibull fitting results.The single event effect of different incident angles,truncation values,different threshold charges and different metal interconnected materials in the model is analyzed by changing the incidence condition.The single particle effect of different incident angles,truncation values,different threshold charges and different metal interconnected materials in the model is analyzed by changing the incidence condition.3)Simulating the single particle effect of proton energy below 2MeV in the multi sensitive volume prediction model.The effect of different incident conditions on the MBU cross section of the proton is predicted,and the energy point of peak and the saturated upset cross section are in agreement with the measured results at the order of magnitude,which proves the accuracy of the model.