简介：Asimple,lowcost,easilymaintained,andreliablefielddistortionsparkgaphasbeendevelopedtooperateatavoltageupto30kV.Theheaderconstructionnecessarytoattachthesparkgapswitchtoasingle12.5μF,40kV(10kJ)capacitorisdescribed.Themainfeaturesofthesparkgapareitswiderangeofvoltageoperation,highcurrentcapacity,lowinductanceandlonglifetime.Theperformanceofsparkgaphasbeentestedinaplasmafocusandresultsarepresentedinthisreport.

简介：

简介：Theglidingarccanofferhighenergyefficiencyandselectivityforchemicalreactionsandhasbeenwidelyappliedinmaterialprocessing,environmentalprotectionandotherindustrialareas.Butthedischargeproperties,measurementofplasmaparametersandrelatedphysicalpro-cessesoftheglidingarcdischargestillneedtofurtherstudied.Inthisstudy,theglidingarcwasdrivenbythetransversemagneticfieldtoproducethenon-equilibriumplasmaathighpressure.Theparametersoftheplasmaatourobservedpointweremeasuredbyopticalmethods.Theexperimentalresultshowsthattheelectrontemperatureisabout0.6eVandtheheavyparticletemperatureisapproximately2987±250K.

简介：

简介：Inthiswork,laserinducedtungstenplasmahasbeeninvestigatedintheabsenceandpresenceof0.6Tstatictransversemagneticfieldatatmosphericpressureinair.Thespectroscopiccharacterizationoflaserinducedtungstenplasmawasexperimentallystudiedusingspace-resolvedemissionspectroscopy.Theatomicemissionlinesoftungstenshowedasignificantenhancementinthepresenceofamagneticfield,whiletheionicemissionlinesoftungstenpresentedlittlechange.Temporalvariationoftheopticalemissionlinesoftungstenindicatedthattheatomicemissiontimeinthepresenceofamagneticfieldwaslongerthanthatintheabsenceofamagneticfield,whilenosignificantchangesoccurredfortheionicemissiontime.Thespatialresolutionofopticalemissionlinesoftungstendemonstratedthatthespatialdistributionofatomsandionswereseparated.Theinfluenceofamagneticfieldonthespatialdistributionofatomswasremarkable,whereasthespatialdistributionofionswaslittleinfluencedbythemagneticfield.Thedifferentbehaviorsbetweenionsandatomswithandwithoutmagneticfieldinairwererelatedtothevariousatomicprocessesespeciallytheelectronsandionsrecombinationprocessduringtheplasmaexpansionandcoolingprocess.

简介：

简介：Previousstudieshaveshownthatleakelectronsincuspedfieldthrusterscanmovealongthechannelaxistotheanodeaftercrossingthemagneticcuspontheexit.Inthispaper,aonedimensionalfluidmodelisbuiltalongtwotypicalelectronpathstostudytheinfluenceofleakelectronsonthedischargecharacteristicsofacuspedfieldthruster,consideringtheelectrontemperatureequation.Itisfoundthatthefrequenciesoflow-frequencyoscillationsincreasewithadecreaseintheproportionofleakelectrons,whichisrelatedtoanincreaseintheionspeedinthechannel.Simulationresultsshowthatthepositionofthepeakelectrontemperatureisnearthemagneticcuspontheexitandthepositionofthepeakelectrondensityislocateddownstreamfromthemiddlemagnetictip.Withadecreaseintheproportionoftheleakelectrons,thepeakelectrontemperatureandpeakelectrondensitydecreaseandthepositionofthepeakelectrondensitymovesawayfromtheexit,whichisrelatedtoadecreaseinthepotentialfallontheexitandanincreaseinconfinementofelectronstothemiddlemagneticcusp.

简介：Inageneralplane-parallelelectrodesystem,theedgeoftheelectrodewillunderminetheuniformityofthedielectricbarrierdischarge(DBD)becauseoftheinfluenceofthedistortedelectricalfield.Inthispaper,theinfluenceofthenon-uniformelectricalfieldontheedgeefectofDBDsinashort-gapisinvestigated.WepresentsomeoftheexperimentalresultsofDBDsproducedbythreekindsofconvex-sphericalelectrodes.Theresultsshowthatthereisadarkarea(thehomogeneousdischarge)inthecentralregionoftheelectrodeandabrighthalo(thefilamentarydischarge)intheouterperipheralregion,andtheradiusofthedarkregionisdeterminedbytheelectrodegeometry.Thecalculatedresultsofthetransverse(radial)fieldcomponentdistributiononthesurfaceoftheelectrodesshowthattheedgeefectdoesnotcomefromtheelectrodeedge,butthetransversefield.Thedischargehasenoughspacetobefullydevelopedandthenformatthefilamentarydischargeintheouterperipheralregionbecausethestreamerofthefilamentarydischargeisdriventomovealongthedirectionofthelongerpathbythetransversefield.Thus,thehomogeneousdischarge(theTownsendDBDoraglowDBD)couldnotbeproducedinthisarea.

简介：Ioncyclotronrangeoffrequency(ICRF)heatinghasbeenusedintokamaksasoneofthemostsuccessfulauxiliaryheatingtoolsandhasbeenadoptedintheEAST.However,theantennaloadwillfluctuatewiththechangeofplasmaparametersintheICRFheatingprocess.ToensurethesteadyoperationoftheICRFheatingsystemintheEAST,fastferritetuner(FFT)hasbeencarriedouttoachievereal-timeimpedancematching.FortherequirementsoftheFFTimpedancematchingsystem,themagnetsystemoftheferritetuner(FT)wasdesignedbynumericalsimulationsandexperimentalanalysis,wherethebiasingmagneticcircuitandalternatingmagneticcircuitwerethekeyresearchedpartsoftheferritemagnet.TheintegraldesigngoaloftheFTmagneticcircuitisthatDCbiasmagneticfieldis2000Gsandalternatingmagneticfieldis±400Gs.IntheFTT,E-typemagneticcircuitwasadopted.FerritematerialisNdFeBwithathicknessof30mmbysettingtheworkingpointofNdFeB,andtheampereturnofexcitationcoilis25throughthetheoreticalcalculationandsimulationanalysis.Thecoilinductancetogeneratealternatingmagneticfieldisabout7mH.Eddy-currenteffecthasbeenanalyzed,whilethemagneticfielddistributionhasbeenmeasuredbyaHallprobeinthemediumplaneofthebiasingmagnet.Finally,thetestresultsshowthegoodperformanceofthebiasingmagnetsatisfyingthedesignandoperatingrequirementsoftheFFT.

简介：Inresponsetothecurrentimbalancephenomenonanditsharmfulness,acurrentsharingcircuitmodelisbuiltup,whichrevealstheunderlyingcausesforthecurrentimbalancethroughaquantitativeanalysis.Then,afeasibleapproachofimprovement,namelyenlargementofthelengthofconnectionbusbars,isproposed.Aftertheamendment,itcanbeseenthatthecurrentsharingcoefficientisalmostunityunderratedorfaultcurrentconditions.

简介：FielddistortiongasswitchisoneofthecrucialelementsinaMarxgenerator,fastlineartransformerdriverandotherpulsedpowerinstallations.Theperformanceofthegasswitch,whichisdramaticallyaffectedbythesurfaceroughnessduetoelectrodeerosionduringthedischargeprocess,directlyinfluencestheoutputparameters,stabilityandreliabilityofthepulsedpowersystem.Inthispaper,anelectrodesurfaceroughness(ESR)calculationmodelhasbeenestablishedbasedonagreatdealofexperimentaldataunderoperatingcurrent.Thedischargecurrentwaveform,thepeakheightoftheburr,theradiusandthedepthofetchpitsintheelectrodeerosionregionwereusedtopredicttheESR.Also,experimentalresultsindicatethatthiscalculationmodelcaneffectivelyestimatetheESRofthetestgasswitch.

简介：

简介：AdustsedimentlayerwasfoundontheoutertubewallwhentheESCP(electrostaticcentrifugalprecipitator)trappeddieselparticulatesorganistersand.TheComptonbackscattermethodwasusedtomeasurethesedimentthicknessduringtheexperiment.Theeffectoftheinletgasvelocityonthedustsedimentlayerwasinvestigated.PIV(ParticleImageVelocimetry)wasusedtomeasurethevelocityfieldbetweentheinnerbarbtubewallandtheoutertubewall.Experimentsshowedthatthethicknessofthesedimentincreasedwithtime,andthesedimentlayeratthelowerendwasmuchthickerthanthatattheupperend.Theagglomerationontheoutertubewallcouldberemovedwhentheinletgasvelocitywasincreasedtoacertainvalue.

简介：Insituwhite-beamsynchrotronradiationtopographicobservationsunderanelectricfieldhavebeenmadeontheKTiOPO4(KTP)familyofcrystals.Theinvestigationshowsastrongenhancementofdiffractedintensityforhklreflections(l≠0)andtopographiccontrastintheformoffinestriationswhentheexternalelectricfieldisparalleltothepolaraxis.Severalkkindsofdopedandundopedsampleswithvariousgrown-indefects,suchasdomainboundaries.growthstriations,growth-sectorboundaries.dislocations.etc.,havebeenstudiedindetail.Theresultssuggestthatthesedefectshaveverylittleeffectonthefield-inducedstriations,ItisbelievedthatthemovementofK^+ionsdrivenbytheelectricfieldleadstoalocalaccumulationofchargesandalatticedistortion.Thestronlyanisotropicconductivityisagoverningfactorintheexplanationofthefield-relatedphenomenainthiskindofquasi-one-dimensionalconductor.

简介：

简介：IntheframeworkoftheITER,qualificationtests,thefirstChinaTFconductorsample（CNTFl）wastestedattheSULTANfacility.ThesamplewasmadeoftwoTFconductorsectionsmanufacturedfromidenticalinternalstannumstrandsprovidedbytheOxfordSuperconductingtechnologycompany（OST）.Inordertoevaluatetheconductorperformance,thecurrentsharingtemperature(Tcs)wasmeasuredatspecifiedelectromagneticloadcyclingsteps.BothconductorsectionsoftheCNTFlsampleshowedidenticalperformance.Tcswas7.2Kbeforecyclingloading,and6.9Kevenafter950cycles,withoutsignificantdegradation,whichsubstantiallyexceedstheITERrequirementof5.7K.ThetestsoftheCNTFlconductorsampleshowedthattheelectromagneticcyclicloadexhibitedanegligibleeffectontheconductorperformance.Thecouplingtimeconstant8forAClosswas214msand71.52msbeforeandafterthecyclingload,respectively.Thetestresultsofthesamplearecomparedwiththestrandperformanceandparametermodelanalysis.

简介：

简介：Highsolid-solubilityCo15Cu35alloyshavebeenpreparedbymeltspinningandsubmittedtoisothermalandanisothermalannealingtoobtaingranularalloys.TheX-raydiffraction(XRD)patternsweremeasuredtoinvesugatethedecompositionofsupersaturatedsolidsolutioninducedbyannealing.Theatomicdiffusionandstructuralevolutionduringtheheattreatmentwereinvestigated.Inviewoftheproblemslimitingtheirappllcation.thehigh-fieldmagneazationcurvesweremeasured.Byafittothehigh-fieldmagnetizationcurves,thegranuiaralloysarefoundhardtobemagneticallysaturatedattheearlystageofnucleationandgrowth.Themagnetizationbehaviorwascorrelacedtotheannealed-inducedstructurealevolutionandalsotothemagnetoresistanceeffect.

简介：In-situwhite-beamsynchrotronradiationtopographicobservationsunderanelectricfieldhavebeenmadeonKTiOPO4familycrystals.Theinvestigationshowsastrongenhancementofdiffractedintensityofhklreflections(l≠0)andthetopographicextinctioncontrast,whenthefieldisappliedalongthepolaraxis.Dopedandundopedsampleswithgrown-indefectsarestudiedindetail.ItisbelievedthatthemovementofK^+ionsdrivenbythefieldleadstoalocalaccumulationofchargesandthelatticedistortion.Allthefield-relatedphenomenaappeartoberelatedtotheone-dimensionalionicconductance.