带状电缆的直流X射线辐照响应

对真空环境下带状电缆模型直流X射线辐照响应进行了实验和数值模拟研究;研制了电缆直流X射线辐照实验系统;使用蒙特卡罗模拟软件计算了直流X光机产生的X射线能谱、通量等参数;建立了带状电缆X射线辐照响应一维计算模型,该计算模型包括电缆导体与介质层间隙和介质层电导率模型。实验测量了两个带状电缆模型的直流X射线辐照响应电流波形,并对其进行了数值模拟。结果显示,在一定的电缆导体与介质层间隙大小假设条件下,采用带状电缆X射线辐照响应计算模型计算的结果与实验测量结果在波形特征和绝对幅度方面比较接近,说明了利用该模型描述电缆直流X射线辐照响应具有其合理性。

Response of strip line under continuous X-ray environment

An experimental system and a numerical model are developed, which use a continuous X-ray source to determine the X-ray direct drive response of strip line in vacuum. The experimental system includes a vacuum cavity, a vacuum group and an electrometer, and the numerical model is a 1-D strip line model which is able to describe the gaps between cable’s conductor and dielectric and the conductivity in the dielectric induced by X-ray. The continuous X-ray environment parameters, such as the X-ray spectrum, flux and so on, are obtained by using MCNP Monte Carlo program. Two strip line models are tested and the experimental results are compared with responses calculated using the numerical model above. It indicates that the X-ray direct drive current waveforms are similar and their amplitudes are approximate, if the gaps’ hypothesis is permitted which is destined to exist in a real strip line. Therefore, the numerical model used to describe cable’s response under continuous X-ray environment is reasonable to some extent.