Experimental study on hard x-rays emitted from metre-scale negative discharges in air
Experimental study on hard x-rays emitted from metre-scale negative discharges in air
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DOI：
10.1088/0022-3727/48/2/025205
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发表时间：
2015-01-21
影响因子：
3.4
通讯作者：
Ebert, U.
中科院分区：
文献类型：
--
作者：
Kochkin, P. O.;van Deursen, A. P. J.;Ebert, U.
我们调查米长的负放电的发展，并专注于他们的X射线发射。我们描述的外观，时间和空间分布的X射线。它们以纳秒级的脉冲形式出现，主要出现在阴极区。光谱可以由具有200 keV特征光子能量的指数函数表征。利用纳秒级的快速摄影技术，我们在记录X射线的时间内拍摄了预击穿现象的详细图像。我们发现双极放电结构，也被称为“试点系统”，在阴极附近。在我们以前的研究X射线从积极的放电，我们相关的X射线发射与正面和负面流光之间的遭遇。我们认为，类似的过程是负责闪电领导者产生的x射线。
We investigate the development of metre long negative discharges and focus on their x-ray emissions. We describe appearance, timing and spatial distribution of the x-rays. They appear in bursts of nanosecond duration mostly in the cathode area. The spectrum can be characterized by an exponential function with 200 keV characteristic photon energy. With nanosecond-fast photography we took detailed images of the pre-breakdown phenomena during the time when x-rays were registered. We found bipolar discharge structures, also called 'pilot systems', in the vicinity of the cathode. As in our previous study of x-rays from positive discharges, we correlate the x-ray emission with encounters between positive and negative streamers. We suggest that a similar process is responsible for x-rays generated by lightning leaders.