Numerical analysis of plasma structure observed in atmospheric millimeter-wave discharge at under-critical intensity
Numerical analysis of plasma structure observed in atmospheric millimeter-wave discharge at under-critical intensity
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DOI：
10.1063/1.5023269
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发表时间：
2018-07
影响因子：
3.2
通讯作者：
Y. Nakamura;K. Komurasaki;M. Fukunari;H. Koizumi
中科院分区：
文献类型：
--
作者：
Y. Nakamura;K. Komurasaki;M. Fukunari;H. Koizumi
使用调谐参数对强度为 1 GW/m2 数量级（比击穿临界强度低一个数量级）的大气毫米波放电进行数值计算，以重现实验中观察到的传播电离前沿中的波长尺度离散等离子体结构。在此结构中，等离子体团沿入射光束的 E 场以 0.9λ 的相同间距排列。计算结果表明，当等离子体团中的电子数密度大于截止密度2.5×1020/m3时，该结构就会出现。等离子体团的入射波和反射波之间的干涉在等离子体团周围产生条纹。邻近的等离子体团到达增强点，该增强点位于距离等离子体团中心0.9λ处。无论等离子体模型如何，与结构相关的知识预计都是正确的，因为所揭示的形成机制仅取决于入射和反射之间的几何干涉。使用调谐参数对强度为 1 GW/m2 量级（比击穿临界强度低一个数量级）的大气毫米波放电进行数值计算，以重现实验中观察到的传播电离前沿中的波长尺度离散等离子体结构。在此结构中，等离子体团沿入射光束的 E 场以 0.9λ 的相同间距排列。计算结果表明，当等离子体团中的电子数密度大于截止密度2.5×1020/m3时，该结构就会出现。等离子体团的入射波和反射波之间的干涉在等离子体团周围产生条纹。邻近的等离子体团到达增强点，该增强点位于距离等离子体团中心0.9λ处。无论等离子体模型如何，与结构相关的知识预计都是正确的，因为所揭示的形成机制仅依赖于入射和...
Atmospheric millimeter-wave discharge at intensity on the order of 1 GW/m2, which is lower than the critical intensity for breakdown by one order, was computed numerically using a tuning parameter to reproduce a wavelength-scale discrete plasmoid structure in a propagating ionization front observed in experiments. In this structure, the plasmoids line up along the E field of the incident beam in the same pitch of 0.9λ. Computational results showed that the structure appears when the electron number density in the plasmoid is greater than the cutoff density of 2.5 × 1020/m3. Interference among an incident wave and reflection waves from a plasmoids produces fringes around the plasmoid. Neighboring plasmoids come to the enhanced point, which is placed at a distance of 0.9λ from the plasmoid center. This knowledge related to the structure is expected to be correct irrespective of the plasma modeling because the revealed forming mechanism is dependent only on the geometrical interference between the incident and reflection.Atmospheric millimeter-wave discharge at intensity on the order of 1 GW/m2, which is lower than the critical intensity for breakdown by one order, was computed numerically using a tuning parameter to reproduce a wavelength-scale discrete plasmoid structure in a propagating ionization front observed in experiments. In this structure, the plasmoids line up along the E field of the incident beam in the same pitch of 0.9λ. Computational results showed that the structure appears when the electron number density in the plasmoid is greater than the cutoff density of 2.5 × 1020/m3. Interference among an incident wave and reflection waves from a plasmoids produces fringes around the plasmoid. Neighboring plasmoids come to the enhanced point, which is placed at a distance of 0.9λ from the plasmoid center. This knowledge related to the structure is expected to be correct irrespective of the plasma modeling because the revealed forming mechanism is dependent only on the geometrical interference between the incident a...