Lifetime of insulator used for multi-gap gas switch

Tieping, 孙铁平 Sun; Peitian, 丛培天 Cong; Zhengzhong, 曾正中 Zeng; Tao, 黄涛 Huang; Liangping, 王亮平 Wang

doi:10.3788/hplpb20122403.0571

Cited by 1 publication

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“…Inspired by the baseline design of gas switches at the High Current Electronics Institute (HCEI) in Russia [4,5] , we investigated several different structures of multi-gap gas switches [6,7] . A 12-brick LTD module with a peak current of 115 kA and a rise time of 89 ns was also developed to test the overall switch performance [8] . Typical parameters, such as lifetime, inductance, and failure rate, were used to characterize the performance of the gas switches.…”

Section: Introductionmentioning

confidence: 99%

Optical Diagnostics of Multi-Gap Gas Switches for Linear Transformer Drivers

Liang¹,

Li²,

Tieping³

et al. 2014

Plasma Sci. Technol.

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The trigger characteristics of a multi-gap gas switch with double insulating layers, a square-groove electrode supporter and a UV pre-ionizing structure are investigated aided by a high sensitivity fiber-bundle array detector, a UV fiber detector, and a framing camera, in addition to standard electrical diagnostics. The fiber-bundle-array detector is used to track the turn-on sequence of each electrode gap at a timing precision of 0.6 ns. Each fiber bundle, including five fibers with different azimuth angles, aims at the whole emitting area of each electrode gap and is fed to a photomultiplier tube. The UV fiber detector with a spectrum response of 260-320 nm, including a fused-quartz fiber of 200 µm in diameter and a solar-blinded photomultiplier tube, is adopted to study the effect of UV pre-ionizing on trigger characteristics. The framing camera, with a capacity of 4 frames per shot and an exposure time of 5 ns, is employed to capture the evolution of channel arcs. Based on the turn-on light signal of each electrode gap, the breakdown delay is divided into statistical delay and formative delay. A decrease in both of them, a smaller switch jitter and more channel arcs are observed with lower gas pressure. An increase in trigger voltage can reduce the statistical delay and its jitter, while higher trigger voltage has a relatively small influence on the formative delay and the number of channel arcs. With the UV pre-ionizing structure at 0.24 MPa gas pressure and 60 kV trigger voltage, the statistical delay and its jitter can be reduced by 1.8 ns and 0.67 ns, while the formative delay and its jitter can only be reduced by 0.5 ns and 0.25 ns.

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