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Single-electrode He microplasma jets driven by nanosecond voltage pulses

机译：纳秒级电压脉冲驱动的单电极He微等离子体射流

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摘要

Excited by 5 ns, 8kV voltage pulses, a 260 μm-diameter, 8 mm long helium plasma jet was generated with a single-electrode configuration in ambient air. Application of fast high voltage pulses (≥10~(12) V s~(-1)) resulted in rapid acceleration of the microplasma plumes; within 5 ns the plume velocity reached 8 × 10~5 m/s, almost three times higher than that of the plasma jet generated with the pulsed voltage of the same amplitude but with a lower increase rate (10~(11) V s~(-1)). Importantly, the ultrashort electric pulses were able to efficiently deposit energy in the plasma during the initiation process, which may be responsible for the rapid acceleration of the ionization wavefronts during the streamer onset, as well as efficient production of reactive plasma species including O(~5P) and N_2~+(B~2∑_u~+) via electron-induced processes. Emission spectral comparison between the plasma jets excited with 5 ns voltage pulses and with 140 ns voltage pulses showed enhanced O(~5P) and N_2~+(B~2∑_u~+) emission by the shorter pulses than the longer ones, while the vibrational and rotational temperature for both plasma jets are at 3000 K and 300 K, respectively.
机译：在5 ns，8kV电压脉冲的激励下，在环境空气中以单电极配置生成了直径260μm，长8 mm的氦等离子体射流。快速高压脉冲（≥10〜（12）V s〜（-1））的施加导致了微浆羽的快速加速。在5 ns内，羽流速度达到8×10〜5 m / s，几乎是等幅脉冲电压下的等离子流产生的等离子流的三倍，而增长率却较低（10〜（11）V s〜 （-1））。重要的是，超短电脉冲能够在引发过程中有效地在等离子体中沉积能量，这可能是拖缆开始期间电离波阵面的快速加速以及有效生成包括O（〜 5P）和N_2〜+（B〜2∑_u〜+）通过电子诱导过程。用5 ns电压脉冲和140 ns电压脉冲激发的等离子体射流之间的发射光谱比较显示，与较长的脉冲相比，较短的脉冲增强了O（〜5P）和N_2〜+（B〜2∑_u〜+）发射，而两个等离子流的振动和旋转温度分别为3000 K和300K。

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  • 来源
    《Journal of Applied Physics》 |2016年第8期|083301.1-083301.7|共7页
  • 作者

    C. Jiang; J. Lane; S. T. Song; S. J. Pendelton; Y. Wu; E. Sozer; A. Kuthi; M. A. Gundersen;

  • 作者单位

    Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA;

    Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA;

    Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA;

    Ming Hsieh Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA;

    Ming Hsieh Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA;

    Frank Reidy Research Center for Bioelectrics, Old Dominion University, Norfolk, Virginia 23508, USA;

    Ming Hsieh Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA;

    Ming Hsieh Department of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, California 90089, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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