大电流脉冲发生器设计及应用OA北大核心CSTPCD

The long magnetic lens is an important part of the dilation framing camera.It can generate a strong mag-netic field in the drift region when stimulated by large current,thus improving the spatial resolution of the camera.Due to the joule heat effect,the long magnetic lens cannot work in large current environment for a long time.In this study,the cur-rent pulse generator applied to the long magnetic lens is designed based on the series and parallel Marx structure.The ef-fects of charging voltage,energy-storage capacitance,load,circuit series and parallel stages on the output current pulse are studied.While the charging voltage and energy-storage capacitance increases,the pulse peak current becomes larger.The same is true when the number of series stages is increased or the load decreases.When the number of parallel stages in-creases,the peak current increases at first and then decreases.In addition,the pulse width is larger by increasing the energy-storage capacitance,the load,and the number of parallel stages.When the number of series stages increases,the pulse width decreases.A long magnetic lens model is established to simulate the magnetic field intensity distribution on the axis.The larger the inner diameter of the long magnetic lens,the weaker the magnetic induction intensity.The greater the excita-tion current,the stronger the magnetic induction intensity.A pulse with peak current of 457 A and full width at half maxi-mum of 6.76 ms is generated by Marx pulse circuit with four stages in series and two in parallel.The current pulse excites the long magnetic lens,and the spatial resolution of 53.72 μm is obtained.