Modelling the initial plasma dynamics in a laser triggered vacuum switch

被引:3
|
作者
Liu, Yuchen [1 ]
He, Zhenghao [1 ]
Xin, Yinan [2 ]
Zhang, Zhuoyu [1 ]
机构
[1] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Wuhan 430074, Peoples R China
[2] China Ship Dev & Design Ctr, Wuhan 430074, Hubei, Peoples R China
基金
中国国家自然科学基金;
关键词
laser; laser-induced plasma; vacuum switch; plasma shielding; DELAY CHARACTERISTICS; EXPANSION;
D O I
10.35848/1347-4065/ac701f
中图分类号
O59 [应用物理学];
学科分类号
摘要
The numerical simulations of the initial plasma dynamics induced by 1064 nm laser irradiation on a KCl-Ti mixture target in a laser-triggered vacuum switch are performed. The simulation results showed that laser irradiance strongly affects the dynamics of the initial plasma. With higher laser fluence, the plasma plume will have higher temperatures and densities, and the shock front will also move faster. During the laser ablation, the plasma shielding is a non-negligible process. As the degree of ionization increases, the absorption coefficient of the plume increases and the it begins to absorb the laser energy. The temperature and velocity of the plume increase dramatically as it absorbs laser energy. When laser fluence gets higher, the plasma shielding starts with a shorter time and a larger proportion of the laser energy is absorbed by the plume.
引用
收藏
页数:14
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