简介：Toinvestigatethefeasibilityforahelicallinetobeusedasapulseformingline(PFL),thetransmissioncharacteristicsofthehelicaltransmissionlineisstudiedboththeoreticallyandexperimentally.Theresultsindicatethatitisfeasibletoemployahelicallineasalong-pulsePFL,andtheinfluenceofitsdispersionisnegligible.ComparedwithaconventionalcoaxialPFL,thehelicalPFLwiththesamesizecanproducealongerpulse.

简介：NeutralbeaminjectorforEASTisdesignedtodeliverdeuteriumbeamswithapowerof2MWto4MWatanenergyof50keVto80keVintotheplasmawithabeamdimensionof12cm×48cm.Consideringthebeamgenerationandtransmission,acolumniformbeam-lineofΦ250cm×400cmisdesignedwithaneutralizer,iondump,calorimeter,bendingmagnetandcryopanels.Thearrangementoftheinternalelementsforthebeam-lineisreported.Arectangularsleevecoupledtotheionsourceisemployedastheneutralizer.Atthedownstreamoftheneutralizer,adipolemagnetseparatestheresidualionsfromthebeampassagewithareflectionradiusof42cmforthefullenergyparticles.Thecalorimeterandtheiondumpserveashighheatfluxcomponents,whichwillworkasthermalinertiatargetsinthefirstphaseofoperation.

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简介：StationarylongpulseplasmaofhighelectrontemperaturewasproducedonEASTforthefirsttimethroughanintegratedcontrolofplasmashape,divertorheatflux,particleexhaust,wallconditioning,impuritymanagement,andthecouplingofmultipleheatingandcurrentdrivepower.Adischargewithalowersinglenulldivertorconfigurationwasmaintainedfor103sataplasmacurrentof0.4MA,q95≈7.0,apeakelectrontemperatureof>4.5keV,andacentraldensityne（0）2.5×1019m-3.Theplasmacurrentwasnearlynon-inductive(Vloop<0.05V,poloidalbeta0.9)drivenbyacombinationof0.6MWlowerhybridwaveat2.45GHz,1.4MWlowerhybridwaveat4.6GHz,0.5MWelectroncyclotronheatingat140GHz,and0.4MWmodulatedneutraldeuteriumbeaminjectedat60kV.Thisprogressdemonstratedstrongsynergyofelectroncyclotronandlowerhybridelectronheating,currentdrive,andenergyconfinementofstationaryplasmaonEAST.Itfurtherintroducedanexampleofintegrated'hybrid'operatingscenarioofinteresttoITERandCFETR.

简介：Ageneratoroftheglidingarcjet(GAJ),whichisdrivenbyatransversemagneticfield,isdevelopedtoproducenon-equilibriumplasmaatatmosphericpressure.ThegastemperatureisestimatedusingthespectrumofOHradicalstobeabout2400±400K.Thedeterminationsofelectrontemperatureandelectrondensitybyusingaline-ratiomethodareelaboratedfortheglidingarcjetplasma.Thisline-ratiomethodisbasedonacollisional-radiativemodel.Theexperimentresultsshowthatelectrontemperatureisabout1.0eVandelectrondensityisabout6.9×1014cm-3.Obviously,theplasmaofGAJisinanon-equilibriumstate.

简介：BasedonthetransmissionlinecodeTLCODE,a1Dcircuitmodelforatransmissionlineimpedancetransformerwasdevelopedandthesimulationresultswerecomparedwiththoseintheliterature.Themodelwasusedtoquantifytheefficienciesofvoltage-transport,energytransportandpower-transportforatransmission-lineimpedancetransformerasfunctionsofΨ(theratiooftheoutputimpedancetotheinputimpedanceofthetransformer)andΓ(theratioofthepulsewidthtotheone-waytransittimeofthetransformer)underalargescaleofm(thecoefficientofthegeneralizedexponentialimpedanceprofile).SimulationresultssuggestthatwiththeincreaseinΓ,fromOto∞,thepowertransportefficiencyfirstincreasesandthendecreases.Themaximumpowertransportefficiencycanreach90%orevenhigherforanexponentialimpedanceprofile(m=1).Withaconsiderationofdissipativelossinthedielectricandelectrodesofthetransformer,tworepresentativedesignsofthewater-insulatedtransformerareinvestigatedforthenextgenerationofpetawatt-classz-pinchdrivers.Itisfoundthatthedissipativelossesintheelectrodesarenegligiblysmall,below0.1%,butthedissipativelossinthewaterdielectricisabout1%to4%.

简介：Opticalemissionspectroscopy(OES)usingthetraceraregasesofArandXehavebeencarriedoutinaradiofrequency(RF)drivennegativeionsourceatInstituteofPlasmaPhysics,ChineseAcademyofScience(ASIPP),inordertodeterminetheelectrontemperatureanddensityofthehydrogenplasma.Theline-ratiomethodsbasedonpopulationmodelsareappliedtodescribetheradiationprocessoftheexcitedstateparticlesandestablishtheirrelationswiththeplasmaparameters.Thespectrallinesfromtheargonandxenonexcitedstateatomswiththewavelengthof750.4and828.0nmareusedtocalculatetheelectrontemperaturebasedonthecoronamodel.Theargonionsemissionlineswiththewavelengthof480and488nmareselectedtocalculatetheelectrondensitybasedonthecollisionalradiativemodel.OEShasgiventhepreliminaryresultsoftheelectrontemperatureanddensitybyvaryingthedischargegaspressureandRFpower.Accordingtotheexperimentalresults,thetypicalplasmaparametersisTe2≈2-4eVandne≈1x1017-8x1017m^-3infrontofplasmagrid.

简介：Undercoronalconditions,thesteadystaterate-equationsareusedtocalculatetheinter-stagelineratiosbetweenLi-likels22p(2p3/2)→ls22s(2S1/2)andHe-likels2p(1P1)→ls2(1So)transitionsforTiintheelectronictemperaturerangesfrom0.1kevto20keV.Theresultsshowthatthetemperaturesensitivitiesarehigherattheelectronictemperaturelessthan5000eVandthetemperaturesensitivitieswilldecreasewiththeincreaseofelectronictemperature.

简介：WestudiedthespatialevolutionoftheFe-Niplasmageneratedbythefundamental(1064nm)andsecond(532nm)harmonicsofaQ-switchedNd:YAGlaser.Theexperimentallyobservedlineprofilesoftheneutraliron(FeI)havebeenusedtoextracttheplasmatemperature(Te)usingtheBoltzmannplotmethod,whereastheelectronnumberdensity(Ne)hasbeendeter-minedfromtheStarkbroadening.Inaddition,westudiedthespatialbehaviorofTeandNewiththevariationoflaserenergyforironplasmabyplacingthetargetmaterial(iron-nickelalloy)inairatatmosphericpressureforbothmodesoftheNd:YAGlaser.