Discharge characteristics of atmospheric pressure pulsed microwave He/N₂ plasma jet

Abstract

It is difficult to generate jet-shaped He microwave plasma jets in ambient air. In this study, a dual-channel pulsed microwave coaxial resonant discharge device is constructed. An atmospheric pressure pulsed microwave He plasma jet is formed when He passes through the central copper tube. And a spatially layered He/N 2 plasma jet is produced when He and N 2 are aerated through the central copper tube and the resonant cavity, respectively. The spatiotemporal ionization evolution

Study of spatiotemporal characteristics of atmospheric-pressure pulsed microwave Ar/N<sub>2</sub> plasma jets

“…上述研究表明, 双通道进气 的放电器可以丰富等离子体射流的形貌, 产生良好的 实验效果, 但很少有研究关注微波频段的双气体通道 结构的等离子体射流特性. 我们课题组前期研究了 He/N 2 微波等离子体射流放电特性 [17] , 即使在微波频 段下, 氦气很难形成等离子体射流, 但是选用双气体 通道结构的放电器, 可以产生空间分层形貌的He/N 2 等离子体射流. 可是, 微波氦气等离子体射流的体积 小于微波氩气等离子体射流, 射流形貌的丰富性也不 如氩气等离子体射流, 同时氦气价格昂贵, 在实际生 产应用中的代价也远超氩气等离子体射流 [18][19][20] .…”