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根据单脉冲过程电光开关气体放电的微观物理过程,提出了氦气放电的一维数值模型。用数值方法分析了气压对单脉冲过程电光开关的气体击穿、放电电流、KDP晶体两侧电压、开关效率、开关速度、等离子区电子温度及等离子体浓度的影响。数值计算结果表明,气压主要影响开关速度的快慢,而对开关效率的大小影响作用不大。在相同开关脉冲的驱动下,在气压较低的情况下,开关速度随气压增大而变快;而在气压较高的情况下,开关速度随气压增大而变慢。由此得到口径为8cm×8cm电光开关的最佳工作气压为1-4 kPa的结论。
According to the microscopic physical process of electro-optical switch gas discharge in single pulse process, a one-dimensional numerical model of helium discharge was proposed. The influence of air pressure on gas breakdown, discharge current, voltage on both sides of KDP crystal, switching efficiency, switching speed, plasma electron temperature and plasma concentration were analyzed numerically. The numerical results show that the air pressure mainly affects the speed of the switch, but has little effect on the size of the switch. Under the same switching pulse, under the condition of low pressure, the switching speed becomes faster with the increase of pressure, while in the case of higher pressure, the switching speed becomes slower with the increase of pressure. The conclusion is obtained that the optimum working pressure of electro-optical switch with aperture of 8cm × 8cm is 1-4kPa.