基于多孔隙触发的三电极场畸变开关设计与实验研究

doi:10.19595/j.cnki.1000-6753.tces.221759

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Abstract The field distortion switch used in the front stage of the Marx generator requires the delay and jitter to be as small as possible to ensure the stability of the output characteristics of the Marx generator device with fast front and low jitter. The field distortion switch of the single hole trigger electrode has a high delay due to the slow generation and diffusion of the initial effective electrons. The proposed structure of the porous trigger electrode can reduce the delay to a certain extent, but the jitter will increase. How to ensure low delay and low jitter at the same time requires further research on the field distortion switch of the porous trigger electrode. Therefore, by optimizing and improving the traditional single-hole trigger electrode structure, this paper proposes an optimized combination design that changes the size and number of apertures to achieve low delay and significantly improve jitter.
The traditional type of 10 mm single-hole trigger electrode structure, 10mm seven-hole trigger electrode structure, 5 mm seven-hole trigger electrode structure are designed for electric field simulation optimization. On this basis, a 5 mm 16-hole trigger electrode structure was designed based on the number of apertures and the size of apertures. The simulation and experiment were compared with the traditional structure. When the working pressure is 0.1 MPa, the insulating medium is air, and the output of the trigger voltage source is 9.42 kV/32 ns, the trigger characteristics of the three trigger electrode structures of 5 mm 16-hole, 10 mm single-hole, and 10 mm seven-hole were tested. The experimental data show that when the working coefficient of the field distortion switch with 5mm 16-hole trigger electrode structure is 71.1%~85.3%, that is, when the working voltage is 20~24 kV, the delay is between 45.2~41.1 ns, and the jitter is between 6.87~5.87 ns.Compared with the traditional single-hole trigger electrode structure, the delay and jitter are reduced by 14.8% and 16.1% respectively, and the performance is improved significantly. Then the influence of trigger voltage on the performance of field distortion switch is verified, which provides a new idea for the study of the performance of porous field distortion switch.
Through simulation theoretical analysis and experimental verification, the conclusions are as follows: (1) Through the simulation of the electric field of the aperture and the number of holes, it is concluded that the smaller the aperture, the more the number, the more uneven the electric field distribution, the lower the self-breakdown voltage, and the higher the field distortion. (2) Under the condition of 0.1 MPa air pressure and dry air insulation medium, the field distortion switch with 5 mm small aperture porous number trigger electrode structure has a delay range of 45.2~41.1 ns and a jitter range of 6.87~5.87 ns in the working coefficient range of 70%~85%. Compared with the traditional single-hole trigger electrode structure, the delay and jitter are reduced by 14.8% and 16.1% respectively, and the performance is improved significantly. (3) When the amplitude of the trigger source voltage is increased to about 3 times, the time delay of the field distortion switch will be reduced by about 1.5 times in the range of 70%~85% of the working coefficient.

Key words： Field distortion switch trigger electrode structure working coefficient breakdown time delay breakdown jitter

Received: 15 September 2022

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TM564

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.221759 OR https://dgjsxb.ces-transaction.com/EN/Y2023/V38/I24/6807

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