纳秒
等离子体
微波食品加热
亚稳态
上升时间
原子物理学
占空比
波形
脉搏(音乐)
氩
毫米
材料科学
物理
光学
电压
激光器
量子力学
探测器
作者
Valentin Mazières,Romain Pascaud,Olivier Pascal,Richard Clergereaux,L. Stafford,Simon Dap,Laurent Liard
标识
DOI:10.1088/1361-6595/abc9ff
摘要
Abstract In the present paper, a detailed investigation of the spatio-temporal dynamics of the recently developed time reversal microwave plasma source is presented. This novel source allows to ignite a plasma at a desired location in a reverberant cavity by focusing the electromagnetic energy in time and space. An important feature is the possibility to control the plasma position only by changing the input microwave waveform. The source is operated in a repetitive pulsed mode with very low duty cycle (typically 5 × 10 −2 %). Nanosecond pulses have rise time lower than 1 ns. The generated plasmas have typical sizes in the millimeter range and are observed using imaging for dozens of nanoseconds. The plasma behavior is investigated for different pressures and repetition frequencies. A strong dependence is observed between each discharge pulse suggesting the existence of an important memory effect. The latter is probably due to argon metastable atoms and/or residual charges remaining in the post-discharge and allowing the next breakdown to occur at a moderate electric field.
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