Recovery of gas density in a nitrogen gap after breakdown

Xinjing Cai; Xiaobing Zou; Xinxin Wang; Liming Wang; Zhicheng Guan; Weihua Jiang
September 2010
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p101501
Academic Journal
The recovery of the gas density and the hold-off voltage of a spark gap after breakdown were investigated with Mach–Zehnder interferometry and two-pulse method, respectively. It was shown that the gas density in a 2.7 mm gap filled with atmospheric nitrogen almost fully recovers at t=50 ms but the breakdown voltage of the gap only recovers to its static hold-off voltage, about 21.4% of its original overvolted breakdown voltage. The mechanisms for the delayed recovery of the ability to be overvolted were discussed.


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