神光装置辐照腔体系统电磁脉冲的数值模拟

Simulation of cavity system generated electromagnetic pulse radiated by SG-facility

应用三维MC程序和PIC程序,对神光装置辐照下腔体内系统电磁脉冲(SGEMP)模型进行了耦合模拟。在半高宽为2.9 ns、平均能量为10.3 keV的轫致谱X射线点源辐照下,圆柱腔内电场最大值高达2 MV/m,以轴向电场为主;磁场最大值约为0.8×10^(-3)T,以角向磁场为主,电磁场最大值都集中在发射面附近,以脉冲直流场为主,交流辐射场幅度较小,约在kV/m量级。考察了注量对SGEMP效应的影响,注量越高,电场沿轴向变化越快,交流辐射场占比越大。

Using 3D MC code and PIC code,model of electromagnetic pulse(SGEMP)generated in the cavity system radiated by SG-facility is calculated.The simulated results show that the intensity of electric field could be 2.2 MV/m and magnetic field be 0.8×10^(-3) T under irradiation of the bremsstrahlung X-ray point source with full width at half maximum 2.9 ns,average energy 10.3 keV produced by SG-facility irradiating the end of cylinder cavity.The electric field is mainly axial and the magnetic field is primarily azimuthal.Both electric field and magnetic field are concentrated near the emitting surface,with the pulsed DC field being predominant and the amplitude of the AC radiation field being relatively smaller,at the level of kV/m.The effect of fluence on SGEMP is also studied,showing that higher fluence leads to faster axial variation of the electric field and larger proportion of the AC radiation field.