电缆X射线辐射感应电导率引起的非线性效应北大核心CSCD

对电缆X射线辐照非线性响应进行了数值模拟。分析了电缆X射线辐照的物理过程,针对同轴电缆和屏蔽多导体电缆,建立了基于有限元方法的二维电缆模型诺顿等效电流源计算方法,着重描述了二维模型下电缆介质辐射感应电导率效应求解方法,模拟了电缆X射线辐照非线性效应,给出了诺顿等效电流源非线性响应规律,并依据物理过程进行了合理性分析。模拟结果显示,由于辐射感应电导率的存在,随着X射线注量的增加,电缆响应幅度会存在明显的饱和现象。对特定类型的电缆,响应电流随着X射线注量增加,依次出现3个时间位置不同的电流峰值。

Nonlinear effect caused by radiation-induced conductivity of cable irradiated by X-ray

Nonlinear response of cable irradiated by X-ray is simulated using numerical method. The physical processes of the X-ray irradiating to cable are analyzed. Norton-equivalent driver model is built up for coaxial cable or shielded multi-cable based on 2-dimension finite-element method, focusing on dielectrics radiation-induced conductivity effect. The nonlinear responses of Norton-equivalent driver are calculated and their regularities are concluded in detail. The simulation result showed that the current amplitude would reach a saturation value as the X-ray fluence increased when induced conductivity existed. For some types of cable, there would be 3 different current peaks appearing successively at different point on the waveform while the X-ray fluence increased.