UV pre-ionizing structures for multi-gap gas switch

Tieping, 孙铁平 Sun; Peitian, 丛培天 Cong; Liang, 盛亮 Sheng; Tao, 黄涛 Huang; Guowei, 张国伟 Zhang; Ning, 郭宁 Guo; Juanjuan, 韩娟娟 Han; Hanyu, 吴撼宇 Wu; Yan, Li; Yang, 李杨 Li; Weixi, 罗维熙 Luo; Liangping, 王亮平 Wang; Zhengzhong, 曾正中 Zeng

doi:10.3788/hplpb20112310.2806

Cited by 5 publications

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“…10. The additional UV pre-ionizing structure does not change the voltage distribution within the switch [14] . The stability of UV light yield and the delay time relative to the trigger pulse depend on the distance between the two UV needles, see Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Double insulating layers were used to improve the switch lifetime and a square-groove structure of inner insulator was utilized to enhance the mechanical reliability of the switch [13] . A pre-ionizing structure mounted at the center of the trigger electrode was used to test its impact on trigger jitter and trigger voltage [14] . In order to investigate the fundamental principles of this gas switch operation, we developed three optical diagnostics, i.e., a high sensitivity fiber array detector, a solar-blinded fiber detector, and a high-speed framing camera.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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Design and investigation of a capacitance-coupling pre-ionized sharpening switch

Zhai,

Yin,

et al. 2024

Review of Scientific Instruments

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The sharpening switch is one of the most important elements in the trigger generator, which is used to sharpen the front of the trigger pulse. The breakdown performance of the sharpening switch has an important influence on the output and stability of the trigger generator. In this paper, a novel 200 kV capacitance-coupling pre-ionized sharpening switch, which can realize pre-ionization by dividing voltage through its own structural capacitances, is proposed and investigated. In order to obtain the optimal parameters of the pre-ionized sharpening switch, the influences of the electrode structure, electrode material, main gap distance, and pre-ionized gap distance on the breakdown performance are studied experimentally. The experimental results show that the electrode structure with a circular knife-edged cathode and a plate-shaped anode has the smallest breakdown jitter, followed by the needle-plate structure and the tapered ball-head structure. The stainless steel electrode has the smallest jitter, followed by graphite, aluminum, and brass electrodes. When the gap distances of the main gap and the pre-ionized gap are 13 and 1.5 mm, respectively, the breakdown stability of the pre-ionized sharpening switch is the best. Under an input voltage pulse with a rise time of about one microsecond, the jitter of the capacitance-coupling pre-ionized sharpening switch with the optimal parameters is 6.08 ns, which is about 0.6% of the rise time of the input pulse. The jitter decreases by 44.5% compared to the switch without pre-ionization. The rise time of the output pulse is sharpened to 17 ns, corresponding to a voltage rise rate of more than 11 kV/ns.

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