简介：AnexperimentalsystemofACarcdischargeinwaterwasdesignedwithpole-poleelectrodesandapeakvoltageof1500Vandatestcircuitwassetupusingvirtualinstrumenttechnology.ThemechanismofanACplasmaarcgeneratedinwaterwasanalyzed.ThevoltagecurrentcharacteristicoftheACplasmaarcwasobtainedfromthewaveform.Thetemperaturecharacteristicwastestedwithaspectrumdiagnosissystem,andtheeffectofdifferentelectrodematerialsonthestrikingvoltageandpeakcurrentwasanalyzed.Theresultsshowthatwhenapowersupplyof6kWisappliedonelectrodeswithagapof2mminwater,thestrikingvoltageisfrom900Vto1300V,thearcvoltageisfrom40Vto100V,thearccurrentisfrom2Ato7A,andthezerorestperiodisfrom1msto2ms.Inaddition,thearcvoltageandcurrentaredifferentforelectrodesinaluminum,copperandstainlesssteel.Thearcvoltageislowerandthecurrentishigherforanaluminumelectrodethanthoseforcopperandstainlesssteelones.Thehighesttemperatureofthearcis7643K.

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简介：Thermalhydraulicanalysiswasperformedforthe2004ITERblanketdesign,whichwasbasedonthefabricationmethodsofforging,drillingandwelding.Resultsshowthat,intheoriginaldesign,theflowdistributioninradialholeswasfarfromuniformbecausedifferentflowdriverswereusedintheradialholes.Improvementoftheflowdriverisproposedinthisstudy.Withtheoptimizationoftheflowdrivers,itisclearlyshownthatthetotalpressuredropdecreasesandabettervelocitydistributioninradialholesisobtained.Themoreuniformheattransfercoefficientamongtheradialholesisbeneficialforreducingthermalstress.

简介：TheChineseFusionEngineeringTokamakReactor(CFETR)isanimportantintermediatedevicebetweenITERandDEMO.TheWaterCooledCeramicBreeder(WCCB)blanketwhosestructuralmaterialismainlymadeofReducedActivationFerritic/Martensitic(RAFM)steel,isoneofthecandidateconceptualblanketdesign.AnanalysisofrippleanderrorfieldinducedbyRAFMsteelinWCCBisevaluatedwiththemethodofstaticmagneticanalysisintheANSYScode.Significantadditionalmagneticfieldisproducedbyblanketanditleadstoanincreasedripplefield.Maximumripplealongtheseparatrixlinereaches0.53%whichishigherthan0.5%oftheacceptabledesignvalue.Simultaneously,oneblanketmoduleistakenoutforheatingpurposeandtheresultingerrorfieldiscalculatedtobeseriouslyagainsttherequirement.

简介：TheDCreactorisanimportantpieceofequipmentforrestrainingloopandripplecurrentsintheinternationalthermonuclearexperimentalreactor(ITER)converterpowersupplysystem.Asthereactorisoperatedatasteadystateof27.5kAandneedstowithstandapeakcurrentof175kA,sothedesignoftheDCreactorusedintheITERconverterpowersupplysystemisnecessary.Anewwater-coolingdry-typeair-corereactorisdesignedinthiswork.Thedetailedstructuralparametersarecalculatedbytheoreticalformulas,andthenthestructureisoptimizedbyelectromagneticsimulationwithANSYS.Finally,thermalanddynamicstabilityanalysesareperformedtoverifythetemperatureandstressataratedcurrentof27.5kAandpulsedcurrentof175kA.TheanalysisresultsshowthatthetemperatureandstressmeettherequirementsoftheITERconverterpowersupplysystem.

简介：AstructuralanalysisoftheInternationalThermonuclearExperimentalReactor(ITER)vacuumvessel'slowerportregionwaspresentedbymeansofafiniteelementanalysismethod.Thepurposeistoevaluatethestressanddisplacementlevelonthisstructureundervariouscombinationsoffivedesignedloads,includingthegravityofthevacuumvessel,seismicloads,electromagneticloads,andpossiblepressureloadstoensurestructuralsafety.ThecyclicsymmetryfiniteelementmodelofthisstructurewasdevelopedbyusingANSYScode.There-sultsshowedthatthemaximumstressdoesnotexceedtheallowablevalueforanyoftheloadcombinationsaccordingtoASMEcodeandtheninevacuumvessel(VV)supportshavetheabilitytosustaintheentireVVandinvessel-componentsandwithstandloadcombinationsunderbothnormalaswellasoff-normaloperationconditions.StressmainlyconcentratesontheconnectingregionoftheVVsupportandlowerportstubextension.

简介：AvisualizationtoolwasdevelopedthroughawebbrowserbasedonJavaappletsembeddedintoHTMLpages,inordertoprovideaworldaccesstotheEASTexperimentaldata.Itcandisplaydatafromvarioustreesindifferentserversinasinglepanel.WithWebScope,itiseasiertomakeacomparisonbetweendifferentdatasourcesandperformasimplecalculationoverdifferentdatasources.

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简介：AdesignofthemainAC/DCconvertersystemforITERisdescribedandthecon-figurationofthemainAC/DCconvertersispresented.Toreducethereactivepowerabsorbedfromtheconverterunits,themainAC/DCconvertersaredesignedtobeseries-connectedandworkinasequentialmode.Thestructureoftheregulatoroftheconvertersystemisdescribed.AsimulationmodelwasbuiltupforthePSCAD/EMTDCcode,andthedesignwasvalidatedaccordingly.Harmonicanalysisandreactivepowercalculationoftheconvertersunitsarepresented.Theresultsrevealtheadvantageofsequentialcontrolinreducingreactivepowerandharmonics.

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简介：Magnetohydrodynamic(MHD)acceleratorisproposedasanextgenerationpropulsionsystem.Itcanbeusedtoincreasetheperformanceofapropulsionsystem.TheobjectiveofthisstudyistoinvestigatetheperformanceofMHDacceleratorusingnon-equilibriumairplasmaasworkinggas.Inthisstudy,thefundamentalperformanceofMHDacceleratorsuchasflowperformanceandelectricalperformanceisevaluatedatdifferentlevelsofappliedmagneticfieldusing1-Dnumericalsimulation.ThenumericalsimulationisdevelopedbasedonasetofdifferentialequationswithMHDapproximation.TosolvethissetofdifferentialequationstheMacCormackschemeisused.AspecifiedchanneldesignedanddevelopedatNASAMarshallSpaceFlightCentreisusedinthenumericalsimulation.Thecompositionofthesimulatedairplasmaconsistsofsevenspecies,namely,N2,N,O2,O,NO,NO+,ande-.Theperformanceofthenon-equilibriumMHDacceleratorisalsocomparedwiththeequilibriumMHDaccelerator.

简介：Intheplasmasheathanarrowplasmachannelgeneratedbyultraintenselaserpulsesissimplifiedasaspecialcylindricalandhollowplasmawaveguidewiththeinfinitethicknessoftheplasmacladding.Theelectromagneticwave(EM)propagationpropertiesoftheplasmachannelnearthecutoffandfarfromthecutoffareconsidered.TheoreticalanalysisshowsthatTE0mandTM0mandhybridmodesemergeintheplasmachannel,whichisinfluencedbythenormalizedfrequencyparameterBandnumericalapertureNA.Thecutoffsofthevariousmodesareapproximated.Single-modeoperationispossiblewithoutahigh-frequencylimitationinthechannel.

简介：AbridgearmprototypeofITERpoloidalfield(PF)convertermoduleshasbeendesignedandfabricated.Non-cophasecounterparallelconnectionischosenasthearmstructureoftheprototype.Amongallfactorsaffectingcurrentsharing,armstructureisthemainone.Duringthedesignofthearmprototype,anovelmethodbasedoninductancematrixesisemployedtoimprovethecurrentsharingofthebridgearm.Thetestresultsontheprototypeshowthatthecurrentsharingperformanceofthearmprototypeismuchbetterthanrelevantdesignrequirement,andthatthematrixmethodisveryeffectivetoanalyzeandsolvethecurrentsharingproblemsofthyristorconverters.

简介：Thecentralpostisoneofthecriticalcomponentsforthelowaspectratiotokamak,whichenduresnotonlyatremendousohmicheatingbecauseitcarriesaratherhighcurrent,butalsoalargeneutronheatingandirradiationowingtotheplasmaoperation.TheDScopperalloyGlidcopAL-25[8]waschosenastheconductormaterialforitsadequatemechanicalpropertiesandphysicsproperties.Thecentralposthasacylindricalstructurewithlotsofcoolingchannels.Thelengthofthecentralpostforthenextgenerationofnuclearfusionsphericaltokamakswillbemorethan10mor20m.Thestructuralstabilityisverycrucial.Whentheappliedloadislargerthanthestructurecriticalbucklingload,thedevicewillloseitsstabilityandcollapse.Inordertocal'culatethecriticalbucklingload,a1/6-segmentfiniteelementmodelwasusedandtheforceactingonthecentralpostwassimulated.Theresultsshowedthattheverticalcompressivestressesmainlyaffectthestabilityofthecentralpost.Thelinearbucklinganalysisresultswithfiniteelementmethodbasedonsmalldeformationtheoryweregiveninthispaper.Therelationcurvesandfunctionsforbucklingfactor,dependingonthedifferentlengthsandtheradiusofthecentralpost,thediameterofcoolingchannelandthemaximumallowablecurrentdensity,werealsoshown.

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简介：Inordertoinvestigatethenuclearresponsetothewater-cooledceramicbreederblanketmodelsforCFETR,adetailed3Dneutronicsmodelwith22.5otorussectorwasdevelopedbasedontheintegratedgeometryofCFETR,includingheterogeneousWCCBblanketmodels,shield,divertor,vacuumvessel,toroidalandpoloidalmagnets,andports.UsingtheMonteCarloN-ParticleTransportCodeMCNP5andIAEAFusionEvaluatedNuclearDataLibraryFENDL2.1,theneutronicsanalyseswereperformed.Theneutronwallloading,tritiumbreedingratio,thenuclearheating,neutron-inducedatomicdisplacementdamage,andgasproductionweredetermined.TheresultsindicatethattheglobalTBRofnolessthan1.2willbeabigchallengeforthewatercooledceramicbreederblanketforCFETR.

简介：Anexperimentandanalysisonremovalofgaseousbenzenebypulsecoronainducedplasmaispresentedinthisarticle.Importantparameterseffectingremovalefficiencyhavebeeninvestigated,suchaspulsepeakvoltage,pulsefrequency,gasinletconcentration,gasflowrateandreactortemperature.Theresultshowsthattheremovalefficiencyincreaseswiththeincreaseinpulsepeakvoltage,pulsefrequencyandreactortemperature,butdecreasesintheriseofgasinletconcentrationandgasflowrate.OntheconditionofVp=36kV,f=80Hz,C=1440mg/m^3andQ=640ml/min,thelargestremovalefficiencyis98%.Finally,thereactedproductsarequalitativelyanalysedandthereactionprocessesarededucedincombinationwithplasma-chemistrytheory.

简介：Plasmafillingcandramaticallyimprovetheperformanceofhighpowermicrowavedevices.Thecharacteristicsofhigh-powermicrowavepropagationalongplasmafilledwaveguidesinanaxialmagneticfieldareanalyzedinthispaper,andtheponderomotiveforceeffectofhighpowermicrowaveistakenintoconsideration.Theoreticalanalysisandpreliminarynumericalcalculationsareperformed.Theanalysesshowthattheponderomotiveeffectwouldchangetheplasmadensity,distributionofmicrowavefieldintensity,anddispersionofwavepropagation.Thehigherthemicrowavepower,thestrongertheponderomotiveeffect.Indifferentmagneticfields,theponderomotiveeffectisdifferent.

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