Water plays a pivotal role in pulse switches, owing to its fast recovery characteristic and high dielectric strength. In this paper, we empirically studied the effect of behavior of vapor bubbles on the dielectric recovery characteristics of water during the post-breakdown. The experimental medium is distilled water, and highly pressurized CO2 in its supercritical phase is used as a comparative medium to test the voltage recovery ratio. The dielectric recovery characteristics of water was explained by alternating expansion-contraction bubble behaviors, including bubble density variation in the second oscillation stage. The experimental results showed that water showed a shorter recovery time (2 ms), and it could be regarded as a promising medium for high-repetition-rate switch. The motion of second oscillating bubbles resulted in a considerably short recovery time.

中文翻译：

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用于高重复率开关的水击穿后介电恢复特性

由于其快速恢复特性和高介电强度，水在脉冲开关中起着举足轻重的作用。在本文中，我们凭经验研究了击穿后蒸汽泡的行为对水的介电恢复特性的影响。实验介质为蒸馏水，以处于超临界相的高压CO2为对比介质，测试电压恢复率。水的介电恢复特性可以通过交替的膨胀-收缩气泡行为来解释，包括第二振荡阶段的气泡密度变化。实验结果表明，水显示出更短的恢复时间（2 ms），可以看作是一种很有前途的高重复率转换介质。