Vacuum surface flashover characteristics of cross-linked polystyrene under high repetition rate burst multi-pulse loading
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摘要: 基于高重复频率强流多脉冲加速器的应用需求，针对交联聚苯乙烯（XLPS）材料在猝发多脉冲下的真空沿面闪络特性开展了实验研究。采用放置于平板电极中的XLPS圆台样品，在脉宽120 ns的单个脉冲和间隔500 ns的三脉冲加载下开展了真空沿面闪络实验，通过对实验平台和实验规范的优化设计，有效提升了实验效率和数据有效性，观测到了样品发生真空沿面闪络前的试样电压顶降现象和前序脉冲闪络对后续脉冲的显著影响，获得了XLPS材料在相应条件下真空沿面闪络的统计数据。在实验基础上，对XLPS材料在高重复频率多脉冲加载下的真空沿面闪络特性进行了分析，为高重复频率多脉冲加速器的绝缘设计提供了实验依据。Abstract: Based on the requirement of high current multi-pulse accelerator, the surface flashover characteristics of cross-linked polystyrene (XLPS) material under burst multi-pulse in vacuum were studied experimentally. Vacuum surface flashover experiments were carried out with XLPS samples placed in flat electrodes under single pulse and three pulses with interval of 500 ns. Special phenomena such as continuous decrease of equivalent impedance of vacuum surface before flashover and continuous maintenance of flashover channel after pulse end were observed, and statistical data of vacuum surface flashover of XLPS materials under corresponding conditions were obtained. On the basis of experiments, the flashover characteristics of XLPS in vacuum under high repetition rate multi-pulse loading are analyzed, which provides experimental basis for insulation design of high repetition rate multi-pulse accelerator.
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图 1 三脉冲真空沿面闪络实验布局图
Figure 1. Experimental layout of triple-pulse vacuum surface flashover
图 4 单脉冲下不同厚度XLPS的真空沿面闪络电压和电场
Figure 4. Vacuum flashover voltage and electric strength of XLPS with different thickness under single pulse
图 5 单脉冲和三脉冲加载下的XLPS真空沿面闪络电压
Figure 5. Vacuum flashover voltages of XLPS under single pulse and triple pulse loading
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