同轴枪脉冲放电等离子体特性及其轴向输运速度分析

Characteristics of Coaxial Gun Pulse Discharge Plasma and Its Axial Velocity Analysis

高密度、高速度等离子体的喷射源(同轴枪装置)是强流脉冲放电装置的热点。为此,实验研究了同轴枪放电装置产生的等离子体特性,以及不同参数下等离子体轴向的输运速度。通过对等离子体的光学与电学诊断,发现由同轴枪喷出的等离子体具有一定体积,并且该等离子体的电学特性以及轴向速度的大小受电压与气压等参数的影响较大。在固定气压下,放电电流以及等离子体轴向输运速度会随着电压的增加而增大;而在固定电压下,放电电流在气压增大时几乎不变,但等离子体轴向输运速度随着气压的增大而减小。此外,实验中均出现了多次放电的现象。

Coaxial gun, a source of high-density and high-speed plasma jet, has been a hot topic of large-current impulsive discharge devices. Therefore, we experimentally investigated the discharge characteristics and the axial velocity of plasma transport for a coaxial gun with various settings. The optical and electrical diagnoses indicate that the discharge plasma has a certain volume, while the discharge characteristics and the axial plasma transporting velocity are sensitive to the applied discharge voltage and the working gas pressure. When the gas pressure is fixed, the discharge current and the axial plasma transporting velocity increase with the discharge voltage. Whereas, when the applied voltage is fixed and the gas pressure increases, the discharge current barely changes but the axial transporting velocity decreases. Plus, the discharge presents a feature of multiple discharges in all the experiments.