大功率激光系统中气体开关工作气压的初步研究
Research on Working Gas Pressure of Spark Gap Switch in High Power Laser System
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摘要:
在两电极气体开关的工作系统中，工作气压决定着开关工作时的静态击穿电压。随着开关的运行，电极烧蚀会使电极间距扩大，需要调节开关内部气压，以使得开关的欠压比(Over-voltage Rate)维持在一个较稳定的水平。欠压比在该水平上可以使得开关的拒动作几率与开关自闪(Self-Fire)几率都在一个可接受的范围。文章对气体开关在不同烧蚀间距下，不同工作气压下的直流耐压水平进行了比较分析，以确定开关在运行过程中的工作气压。同时该气压可使气体开关满足其正常触发导通所要求的欠压比。 Abstract:The static breakdown voltage of the switch is determined by the working gas pressure. Graphite electrodes will erode during the discharge operation of the system. The erosion of the electrodes causes rise of the space of them. We must make sure that the over-voltage rate is relatively stable when changing the inner gas pressure of the switch. When the over-voltage rate of the switch is low, the rate of unstable triggering and self-fire will decline. In this paper we compare the DC breakdown voltage of different switches under different gas pressures and test their triggering reliability. The range of working gas pressure in various stages can be determined by analyzing the experimental data. Based on the over-voltage rate which makes sure conduction of the switch, we finally get the gas pressure regulation method to ensure the operation stability.
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