激光触发SF_6-N_2混合气体开关的数值模拟  

Laser triggered SF_6-N_2 mixture switch modeling

作　　者：王刚华[1] 王文斗[2] 李洪涛[2] 林其文[2] 

机构地区：[1]冲击波与爆轰波国防科技重点实验室,四川绵阳621900 [2]中国工程物理研究院流体物理研究所,四川绵阳621900

出　　处：《强激光与粒子束》2006年第11期1922-1926,共5页High Power Laser and Particle Beams

基　　金：中国工程物理研究院基金资助课题(20030213)

摘　　要：在气体放电物理的基础上,对SF6和N2采用双光子电离模型,对碳氢化合物的光电离采用3能级模型,并考虑了混合气体的热电离和激光对气体的欧姆加热作用,建立了激光触发SF6-N2混合气体开关的数值模型,模拟了激光触发SF6-N2混合气体多级间隙开关实验。激光触发延迟时间的计算值与实验结果符合较好。理论计算表明:激光触发SF6-N2混合气体间隙开关的延迟时间随SF6含量的增加呈上升趋势,而随激光脉冲能量、充气压力等的上升呈下降趋势。A numerical model of laser triggered SF6-N2 mixture switch is established on gas discharge physics. The photoionizations of SF6 and N2 are described by the double photon ionization model. The photoionization of hydrocarbon can be modeled as a three energy level system simplified from the model of Bischel W K. The mixture is heated by eletric field, and the heating ionizations of mixtures are considered. The calculated switch time delay is compared with that of experiment in the paper, The calculated values of laser triggered delay are in agreement with the experimental results. The delay of laser triggered SF6-N2 mixture switch increases as the percentage of SF6 in the mixture increases, and decreases as the energy of laser pulse, or the pressure increases.

关 键 词：激光触发 SF6—N2混合气体 气体开关 延迟时间 闭合时间 

分 类 号：TN249[电子电信—物理电子学]