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首页> 外文期刊>Plasma Sources Science & Technology >Formation and propagation of ionization waves during ns pulse breakdown in plane-to-plane geometry
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Formation and propagation of ionization waves during ns pulse breakdown in plane-to-plane geometry

机译：平面与平面几何中NS脉冲击穿期间电离波的形成和传播

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摘要

Ionization wave development during ns pulse breakdown in nitrogen between two parallel plate, dielectric-covered electrodes is studied by ps electric field induced second harmonic (EFISH) generation and kinetic modeling. The results indicate formation of two well-defined ionization waves in the discharge gap, which requires a relatively high initial electron density. The first, anode-directed, wave is produced by 'sweeping' the initial electrons by the applied voltage pulse. The second wave originates between the cathode and the first wave front, due to the field enhancement in this region, generating two wave fronts propagating in opposite directions and observed in plasma emission images. Only the anode-directed front of the second wave is detected by the EFISH measurements, most likely due to the proximity of the cathode-directed front to the wall. Both the measurements and the modeling predictions exhibit a transient electric field overshoot in the center of the gap, caused by the anode-directed front of the second wave. The boundary between the plasma domains formed ahead of the first wave and behind the second wave, observed in the plasma emission images, is detected by the EFISH measurements and predicted by the modeling calculations. The electron density and coupled energy distributions predicted by the model at the end of the discharge pulse are nearly uniform, except near the cathode-adjacent wall, where the applicability of the present model is uncertain and which is not accessible to the EFISH measurements.
机译：利用ps电场诱导二次谐波（EFISH）产生和动力学模型研究了ns脉冲在两个平行平板介质覆盖电极间氮气击穿过程中电离波的发展。结果表明，在放电间隙中形成两个定义明确的电离波，这需要相对较高的初始电子密度。第一个是阳极导向的波，通过外加电压脉冲“扫掠”初始电子产生。第二波起源于阴极和第一波前之间，这是由于该区域的场增强，产生了两个反向传播的波前，并在等离子体发射图像中观察到。EFISH测量仅检测到第二波的阳极定向波前，这很可能是因为阴极定向波前靠近壁。测量和建模预测均显示，间隙中心存在瞬态电场超调，这是由第二波的阳极指向前沿引起的。在等离子体发射图像中观察到的第一波之前和第二波之后形成的等离子体畴之间的边界由EFISH测量检测，并通过建模计算进行预测。在放电脉冲结束时，由该模型预测的电子密度和耦合能量分布几乎是均匀的，但靠近阴极相邻壁的情况除外，在这种情况下，本模型的适用性不确定，且无法通过EFIH测量获得。

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  • 来源
    《Plasma Sources Science & Technology》 |2020年第12期|共11页
  • 作者

    Keegan Orr; Xin Yang; Ilya Gulko; Igor V Adamovich;

  • 作者单位

    Nonequilibrium Thermodynamics Laboratory Department of Mechanical and Aerospace Engineering The Ohio State University Columbus OH 43210 United States of America;

    Nonequilibrium Thermodynamics Laboratory Department of Mechanical and Aerospace Engineering The Ohio State University Columbus OH 43210 United States of America;

    Nonequilibrium Thermodynamics Laboratory Department of Mechanical and Aerospace Engineering The Ohio State University Columbus OH 43210 United States of America;

    Nonequilibrium Thermodynamics Laboratory Department of Mechanical and Aerospace Engineering The Ohio State University Columbus OH 43210 United States of America;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    ionization wave; ns pulse discharge; EFISH; kinetic modeling;

    机译：电离波;NS脉冲放电;海蜇;动力学建模;

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