Optical characteristic of vacuum surface flashover of grooved dielectrics

Cheng Guoxin; Cheng Xinbing; Yang Jie; Liu Lie

doi:10.3788/HPLPB20132505.1205

Volume 25 Issue 05

Mar. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(05): 1205-1210

Xu Xiong, Wei Yanyu, Shen Fei, et al. Simulation of 650 GHz sine waveguide backward wave oscillator[J]. High Power Laser and Particle Beams, 2012, 24: 5-6. doi: 10.3788/HPLPB20122401.0005

Citation:

Cheng Guoxin, Cheng Xinbing, Yang Jie, et al. Optical characteristic of vacuum surface flashover of grooved dielectrics[J]. High Power Laser and Particle Beams, 2013, 25: 1205-1210. doi: 10.3788/HPLPB20132505.1205

Xu Xiong, Wei Yanyu, Shen Fei, et al. Simulation of 650 GHz sine waveguide backward wave oscillator[J]. High Power Laser and Particle Beams, 2012, 24: 5-6. doi: 10.3788/HPLPB20122401.0005

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Optical characteristic of vacuum surface flashover of grooved dielectrics

doi: 10.3788/HPLPB20132505.1205

1.
College of Opto-electric Science and Engineering,National University of Defense Technology,Changsha 410073,China

Received Date: 2012-10-29
Rev Recd Date: 2012-11-29
Publish Date: 2013-03-12

Abstract

Abstract

Using an ultra high-speed framing camera Hsfc-Pro, the development of vacuum surface flashover of grooved dielectrics is investigated. Variations in flashover images between the plane and grooved dielectric samples are compared. Then the capability of grooved dielectrics in strengthening the insulation strength is discussed. It is found that the introduction of periodical grooves alters obviously the flashover channel. With respect to the plane samples, their flashover channel develops along a straight line across the A-K gap, while for the grooved dielectrics, their flashover channel locates at the circular edge of the samples. Such a bended path increases obviously the flashover distance, therefore, the flashover time delay of grooved dielectrics is at least /2 times that of plane ones. This certifies that grooved dielectrics can increase promisingly the insulation strength without increasing their physical dimension.
- grooved dielectric,
- surface flashover,
- optical diagnostic,
- long pulse

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