In this work,the influence of the electrode surface roughness on the self-breakdown gas switch is investigated by physical analysis,computer simulation and experiment.Cu-W electrodes of different surface roughness wer...In this work,the influence of the electrode surface roughness on the self-breakdown gas switch is investigated by physical analysis,computer simulation and experiment.Cu-W electrodes of different surface roughness were tested under the conditions of a pulse repetitive frequency of50 Hz,self-breakdown voltage of~30 kV,and peak current of~2 k A for~93000 shots(the total charge transferred was~15 C).The coefficients of variation of the self-breakdown voltage of Cu-W 0.8,Cu-W 3.2 and Cu-W 12.5 electrodes were~2.95%,~1.62%and~1.16%,respectively.With the increase of electrode roughness,the erosion area decreased continuously,indicating that the breakdown positions were more stable and the coefficient of variation of breakdown voltage decreased.The method showed that decreasing the coefficient of variation of the self-breakdown voltage by increasing the surface roughness of electrode greatly improves the stability of the self-breakdown switch,which is significant for their application in compact highpower pulse power devices over a long time with stable operation.展开更多
Marx generator is a voltage boosting device for power pulse compression,in which its capacitors are charged in parallel and discharged in series.To get a higher voltage boost ratio,high-voltage silicon stacks have bee...Marx generator is a voltage boosting device for power pulse compression,in which its capacitors are charged in parallel and discharged in series.To get a higher voltage boost ratio,high-voltage silicon stacks have been applied to substitute the isolated inductances in this study.Experiments with two isolation modes in the Marx generator have been carried out.Experimental results reveal that the high-voltage silicon stacks with the parameters of 50 kV/1 kA used in the Marx generator can increase the voltage step-up ratio to 168.6:1,up from 141:1 and 162.9:1 when isolating inductances and silicon-stacks with parameters of 50 kV/3 kA are applied,respectively.Moreover,the silicon stack-isolating-type Marx generator can almost eliminate the pre-pulse existing on the load if the isolated inductances employed.Therefore,it is crucial to choose appropriate high-voltage silicon stacks as the isolating devices in the Marx generator designed in this study.展开更多
基金Huxiang Youth Talent Support Program(No.2020RC3030)State Key Laboratory of Pulsed Power Laser Technology(No.SK2021ZR02)。
文摘In this work,the influence of the electrode surface roughness on the self-breakdown gas switch is investigated by physical analysis,computer simulation and experiment.Cu-W electrodes of different surface roughness were tested under the conditions of a pulse repetitive frequency of50 Hz,self-breakdown voltage of~30 kV,and peak current of~2 k A for~93000 shots(the total charge transferred was~15 C).The coefficients of variation of the self-breakdown voltage of Cu-W 0.8,Cu-W 3.2 and Cu-W 12.5 electrodes were~2.95%,~1.62%and~1.16%,respectively.With the increase of electrode roughness,the erosion area decreased continuously,indicating that the breakdown positions were more stable and the coefficient of variation of breakdown voltage decreased.The method showed that decreasing the coefficient of variation of the self-breakdown voltage by increasing the surface roughness of electrode greatly improves the stability of the self-breakdown switch,which is significant for their application in compact highpower pulse power devices over a long time with stable operation.
基金the National Natural Science Foundations of China under grant nos.51477177,51707198 and 51641707.The authors want to thank X.Zhou,X.Yang and Z.L.Pan for their suggestions and encouragements to the experiment.The assistance of M.Zhu in the experiment is also gratefully acknowledged.
文摘Marx generator is a voltage boosting device for power pulse compression,in which its capacitors are charged in parallel and discharged in series.To get a higher voltage boost ratio,high-voltage silicon stacks have been applied to substitute the isolated inductances in this study.Experiments with two isolation modes in the Marx generator have been carried out.Experimental results reveal that the high-voltage silicon stacks with the parameters of 50 kV/1 kA used in the Marx generator can increase the voltage step-up ratio to 168.6:1,up from 141:1 and 162.9:1 when isolating inductances and silicon-stacks with parameters of 50 kV/3 kA are applied,respectively.Moreover,the silicon stack-isolating-type Marx generator can almost eliminate the pre-pulse existing on the load if the isolated inductances employed.Therefore,it is crucial to choose appropriate high-voltage silicon stacks as the isolating devices in the Marx generator designed in this study.
