真空磁绝缘传输线损失电子模拟
Simulation of loss electron in vacuum magnetically insulated transmission lines
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摘要: 真空磁绝缘传输线建立磁绝缘状态的初始阶段，损失电子轰击阳极，发生轫致辐射。针对自限制流同轴圆筒模型，通过粒子模拟获得了损失前沿在能量传输方向的推进速度、电子到达阳极时的能谱和角分布情况，在此基础上采用蒙特卡罗方法模拟得到了轫致辐射所产生的X射线能谱。数值计算结果表明:电磁波损失前沿在能量传输方向的推进速度小于光速；损失前沿电子密度稳定。在自限制流磁绝缘传输线中，损失电子处在较宽的能量范围内，其电子偏移角度较小。建立了对应于同轴圆筒真空磁绝缘传输线的电子/光子输运模型，获得了损失电子轰击阳极产生的X射线能谱。Abstract: In the beginning of magnetic insulated period, loss electron in coaxial vacuum magnetically insulated transmission line(MITL) strikes anode and the bremsstrahlung photons are generated in the mean time. Based on the self-limited flow model, velocity in direction of energy transport, energy spectrum and angular distribution of loss electron are simulated by PIC code, energy spectrum of bremsstrahlung photons as well calculated though Monte Carlo method. Computational results show that the velocity of loss electron is less than 2.998×108 m/s, the angular excursion of electron is not much in a board extent of energy spectrum. These results show an indirect diagnosis of vacuum insulted transmission line working status based on loss electron bremsstrahlung.
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