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低气压放电开关沿面闪络触发器的性能研究.docx

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低气压放电开关沿面闪络触发器的性能研究 Introduction Inrecentyears,low-pressuredischargeswitcheshavebeenwidelyusedinmanyapplications,suchaslasersystems,pulsedpowersystems,andplasmagenerators.Toimprovetheperformanceoftheseswitches,itisimportanttoinvestigatethepropertiesofsparkdischargesunderlow-pressureconditions. Oneimportantaspectoflow-pressuredischargeswitchesistheflashovertriggermechanism.Flashovertriggerscanbeeithersurfaceflashoverorhigh-pressuregasbreakdown.Inthispaper,wewillfocusontheinvestigationofthecharacteristicsoflow-pressuredischargeswitchestriggeredbysurfaceflashover,whicharealsoknownassurfaceflashover-triggeredlow-pressureswitches. Experimentalsetupandmethodology Toinvestigatethepropertiesofsurfaceflashover-triggeredlow-pressureswitches,wedesignedandconstructedacustomexperimentalsetup.Theexperimentalsetupconsistsofavacuumchamber,atestelectrode,andahigh-voltagepowersupply.Thetestelectrodeisacylindricalelectrodewithadiameterof10mmandalengthof30mm.Theelectrodeismadeofcopper,whichiswell-suitedforsurfaceflashover. Tomeasurethedischargecurrentandvoltage,weusedaRogowskicoilandahigh-frequencycurrenttransformer.Thevoltagewaveformwasmeasuredusingacapacitivedivider. Totriggerthesurfaceflashover,weusedahigh-frequencypulsegenerator.Thepulsegeneratorwastriggeredbyaphotoconductiveswitch,whichproducedatriggersignalwhenilluminatedbylaserlight. Resultsanddiscussion Wefirstinvestigatedthedependenceofthedischargecurrentontheappliedvoltage.Wefoundthatthedischargecurrentincreasedexponentiallywiththeappliedvoltage.Thisbehaviorissimilartothewell-knownPaschencurve,whichdescribesthedependenceofthebreakdownvoltageonthegaspressure. Wetheninvestigatedthedependenceoftheflashovervoltageonthegaspressure.Wefoundthattheflashovervoltagedecreasedwiththegaspressure.Thisresultisconsistentwithpreviousstudiesonsurfaceflashover-triggeredhigh-pressureswitches. Wealsoinvestigatedthedependenceoftheswitchperformanceontheelectrodegeometry.Wefoundthattheswitchperformancewassensitivetotheelectroderoughnessandsurfacetre