X-ray generation in repetitive pulsed discharge in atmospheric air with a point-to-plane gap
大气压尖板电极结构重复频率纳秒脉冲放电中X射线辐射特性研究

Research on the characteristics of X-ray emission in repetitive pulsed discharge is associated with the behavior of runaway electrons and the mechanism of nanosecond pulsed discharge.In the experiments,X-ray emission in the repetitive pulsed discharge with a rise time of～15 ns and an FWHM of 30-40 ns in atmospheric air is directly measured by a detection system consisting of NaI scintillator and a photomultiplier tube,and the energy range of the X-ray detector is demonstrated to be between 10 and 130 keV. Results show that main part of the energy of X-ray is from 20 keV to 90 keV,and a little X-ray with an energy of less than 20 keV or more than 90 keV is detected.X-ray emission increases with the increase of pulse repetition frequency,and it has a peak value with the variation of air gap spacing.There is a maximum value of X-ray emission when the nanosecond discharge appears in a diffuse mode.