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Abstract
To study the influence of the electron beam radius on the deposition parameters in dielectric under high energy electron irradiation, a model of dielectric irradiated by plane electron beam source was established. Monte Carlo simulation method was used to calculate the distribution of the injection current density, injection charge density, dose rate and radiation induced conductivity in the dielectric layer of Teflon after electron irradiation with different energies and different beam radii. The results show that the radius of the electron beam source has little influence on the distribution trend of the injection current density in the dielectric layer, as well as the peak position of the injection charge density and the dose rate, but it will significantly affect the peak value of injection charge density and the dose rate. When the electron beam radius is smaller than the dielectric layer radius, the calculated peak is higher than that of the electron beam completely covering the dielectric layer. The higher the electron energy is, the greater the relative deviation will be.
Highlights
When the dielectric materials used in the spacecraft are irradiated by high energy electrons, the electrical charge will be deposited inside the dielectric because of the insulation properties of the dielectric material, and the deep charging phenomenon is generated in the medium layer[1,2,3]
It can be seen that when the energy of the electron beam is 1 MeV, the radius of the electron beam source has little influence on the distribution trend of the injected current density varies with the depth of the dielectric, and has no effect on the position of the peak value of the deposited charge and the deposition energy
By using Monte Carlo simulation method, the distribution of the injected current density, deposition charge density, and the dose rate in the dielectric are obtained at various cases of irradiation electron beams with different energy and different beam radii
Summary
When the dielectric materials used in the spacecraft are irradiated by high energy electrons, the electrical charge will be deposited inside the dielectric because of the insulation properties of the dielectric material, and the deep charging phenomenon is generated in the medium layer[1,2,3]. To obtain the charging electric field of dielectric material irradiated by high energy electron beam, it is necessary to obtain the physical parameters such as the distribution of the injection current density, the distribution of the deposited charge and the distribution of the deposition energy in the dielectric, and the time evolution of the electric field can be obtained through the Poisson’s equation [7,8]. In the Monte Carlo simulation of high energy electron irradiation process, it is necessary to establish the calculation model of electron irradiation medium. To quantitatively study the influence of the radius of the electron beam and the size of the irradiated dielectric material on the simulation results, a Monte Carlo simulation model of Teflon irradiated by high energy electron is established in this paper. The deposition parameters under different radii of electron beam irradiation are obtained and the influence of the electron beam radius on the simulation results is summarized
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