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EAST4MW中性束注入放电模拟研究.docx

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EAST4MW中性束注入放电模拟研究 Abstract Inthisstudy,asimulationofaneutralbeaminjection(NBI)dischargeinEASTtokamakwasconductedusingthe4MWheatingpower.Thesimulationwascarriedoutusingthetwo-fluidmodelandthenumericalanalysissoftwareANSYSFluent.Theresultsofthesimulationshowthattheneutralbeamefficiencyisaffectedbyseveralfactors,includingtheplasmadensityandtemperature,theneutralbeaminjectionangle,andtheneutralbeamenergy.TheanalysisofthesefactorscanprovideinsightintooptimizingNBIsystemsforfusionexperiments. Introduction NBIisakeytechnologyforheatingandcontrollingplasmasintokamakfusionexperiments.TheNBIsystemisdesignedtoinjecthigh-energyparticlesintotheplasmainordertoheatitupandtocarryoutplasmacurrentdrive.IntheEASTtokamak,theNBIsystemcurrentlyuses4MWheatingpower.However,theefficiencyoftheNBIsystemisaffectedbyseveralfactors,andthusasimulationstudyisnecessarytooptimizetheNBIsystemparametersandimproveitsperformance. Methodology Thesimulationwascarriedoutusingthetwo-fluidmodelandtheANSYSFluentsoftware.ThegeometryofthesimulationwasbasedontheEASTtokamakandincludedthevacuumvessel,theplasmaregion,theNBIsystem,andthediagnosticsystems. Thesimulationwasinitiatedbysettingtheplasmadensityandtemperature,andtheneutralbeaminjectionangleandenergy.Then,thesimulationwasrunforaspecifiedperiodoftime,duringwhichtheplasmaparametersandtheneutralbeampropertiesweremonitoredatvariouspointsinthesimulationdomain. Results Thesimulationresultsshowthattheplasmadensityandtemperaturestronglyaffecttheefficiencyoftheneutralbeaminjection.Specifically,thedensityoftheplasmaaffectstheneutralbeampenetrationdepth,whilethetemperatureoftheplasmaaffectstheionizationrateoftheinjectedparticles. ThesimulationalsoshowsthattheneutralbeaminjectionangleandenergyhaveasignificanteffectontheefficiencyoftheNBIsystem.Ingeneral,alowerinjectionangleandhigherenergyresultinbetterneutralbeamefficiency. Finally,thesimulationresultsprovideinsightintotheoptimalparametersfortheNBIsystemintheEASTtokamak.Specifically,thesimulationsuggeststhata45-degree