强流电子束加速器中气体开关的电磁辐射等效模型

Equivalent model of electromagnetic radiation induced by gas-gap switches in intense electron beam accelerator

对触发开关和主开关产生电磁辐射的机理进行了详细的分析,将气体开关导电通道等效为电偶极子,理论分析了其辐射电磁波的空间分布,以同轴电缆为实验对象,研究了电磁辐射的干扰。实验测量了触发开关和主开关的电磁辐射信号,结果表明,运用偶极辐射等效可以很好地描述二者的辐射特性。在强流电子束加速器产生电磁辐射的时刻,同轴电缆中感应出了一定强度的电流,幅值达3V,已经足以对其他信号的准确测量产生影响。

The radiation generated by gas gap switches in the process that intense electron beam accelerator is running with pseudo load may cause the computer to be black screen. The mechanism of electromagnetic radiation induced by the triggered spark-gap switch and main switch is analyzed carefully in this paper. The charging gap of the gas-gap switches is equivalent to e- lectric dipole, and the spatial distribution of the radiation is analyzed theoretically. The radiation signals of the triggered spark-gap switch and main switch are measured, and the result shows that the theoretical analysis is reasonable. At last, the coaxial cable is used to evaluate the interference of the radiation. At the moment that the radiation signal generates in the intense electron beam accelerator, the induced voltage in the coaxial cable reaches to nearly 3 V, which could cause inaccuracy in the measurement of other signals.