Controlling branching in streamer discharge by laser background ionization
Controlling branching in streamer discharge by laser background ionization
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DOI：
10.1088/0022-3727/44/7/075204
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
E. Takahashi;S. Kato;A. Sasaki;Y. Kishimoto;H. Furutani
中科院分区：
文献类型：
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作者：
E. Takahashi;S. Kato;A. Sasaki;Y. Kishimoto;H. Furutani
KrF激光辐照控制了大气氩气中的正流光分支。激光照射改变了流光放电前的本底电离量。测量电离电流使我们能够评估KrF激光形成的初始电子密度。我们观察到典型的羽毛状分支结构，发现它仅在辐照区被抑制。影响支化的电离密度阈值为5 × 105 cm−3。雪崩头的大小与初始电子之间的平均距离之间的关系解释了这种抑制行为。这些实验结果支持羽毛状结构起源于Loeb-Meek分支模型，即单个雪崩的概率合并。
Irradiation with a KrF laser controlled the positive streamer branching in atmospheric argon gas. This laser irradiation changed the amount of background ionization before the streamer discharge. Measuring the ionization current allowed us to evaluate the initial electron density formed by the KrF laser. We observed characteristic feather-like branching structure and found that it was only suppressed in the irradiated region. The threshold of ionization density which can influence the branching was evaluated to be 5 × 105 cm−3. The relationship between the size of avalanche head and mean distance between initial electrons explained this suppression behaviour. These experimental results support that the feather-like structure originates from the branching model of Loeb–Meek, a probabilistic merging of individual avalanches.