Modeling of switching delay in gas-insulated trigatron spark gaps

Modeling of switching delay in gas-insulated trigatron spark gaps
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气体绝缘三角管火花隙开关延迟的建模

DOI:
10.1063/1.3693033
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发表时间:
2012-03
影响因子:
3.2
通讯作者:
潘垣
潘垣
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
李黎;蔡礼;齐向东;林福昌;潘垣

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基于考虑扭曲电场增强的气体放电理论,提出了一个物理模型来估算主电极内带有触发针的气体绝缘三角管火花隙的开关延迟。该模型统一了已发现的两种击穿模式,即快速击穿模式(FBM)和慢击穿模式(SBM)。Raether判据可以区分这两种模式。如果触发器针尖附近的主电场和增强电场足够大,就容易形成FBM。否则,如果流光的发展需要依赖于二次电离过程和相应的扭曲电场增强,则主能隙的击穿将转变为SBM。触发器针尖附近的增强电场可能会影响FBM的阈值主电场。扭曲的电场增强会影响SBM的开关延迟长度。
Based on the gas discharge theory involving distorted E-field enhancement, a physical model is proposed to estimate the switching delay for gas-insulated trigatron spark gaps with a trigger pin inside the main electrode. Two discovered breakdown modes, i.e., fast-breakdown mode (FBM) and slow-breakdown mode (SBM), can be unified in this model. Raether criterion can distinguish these two modes. If the main E-field and enhanced E-field near the trigger pin tip are great enough, FBM forms easily. Otherwise, if streamer development needs to rely on the second ionization process and relevant distorted E-field enhancement, the breakdown of the main gap would turn into SBM. The enhanced E-field near the trigger pin tip may affect the threshold main E-field of FBM. The distorted E-field enhancement may affect the switching delay length of SBM.
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