电子帘加速器中阴栅组件结构的数字化设计X

1611Vol.16,No.11200411HIGHPOWERLASERANDPARTICLEBEAMSNov.,2004:100124322(2004)1121485204X1,1,2,2(1.,230026;2.,230029):,,2.35kW1mm,14001430,75%,4,,:;;LaB6;;:TL594:A,,LaB6,,,,,LaB6,LaB6,,,,,,,1Fig.1Operatingprincipleofcathode/gridassemblies11,,,,,LaB6,,,JRichardsonJ=AT2e-W/kT(1):A;W;k,k=8.610-5eV/K;TLaB6:A=29.0Acm-2K-2,W=2.66eV22,,LaB6,,Mo(1),Mo(2),BNTa,,LaB6,qq=S(T41-T42)(2):-;,SX:2004201207;:2004205208:(1971),,,,;E2mail:[e-mail],,,,CAD/CAM/CAE;E2mail:[e-mail]©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Fig.2Sectionofcathode/gridassemblies2;T1,T2q¤T+q=0(3):,,(2)((3)),,,,3,4,,,,2500K,,,,Fig.3Emissivityvstemperature3Fig.4Conductivityvstemperature3:,,,;,,,;,,,,,4,,533.1I2DEAS9(integrateddesignengineeringanalysissystem9),I2Deas9(freemeshing)(mappedmeshing),,(mappedmeshing),,,,,,3.2:2.35kW;;25#LaB66,76,7,LaB614231430,600mm684116©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Fig.5Iterativetemperatureofparts575%14001430,LaB614001430,,Fig.6LongitudinalsectiontemperatureonLaB66LaB6Fig.7CrosssectiontemperatureonLaB67LaB64LaB6Fig.8Wiretemperaturevspoweratdifferentdiameter8,LaB6,:2.35kW,0.50.7mm,,LAB6,1.0mm,0.50.7mm85.,,,,,,,784111:©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.:[1]EbiharaK,HiramatsuS.High2current2densitygunwithaLaB6cathode[J].ReviewofScientificInstruments,1996,67(8):27652769.[2],.[M].:,1993.(XueZQ,WuQD.Electronemissionandelectronpowerspectrum.Bei2jing:BeijingUniversityPress,1993)[3]KatsapV,SewellPB,WarrenK,etal.Uniformlarge2areathermioniccathodeforSCALPEL[A].ProcofSPIE[C].1999,3777:26.[4]HerniterME,GettyWD.HighcurrentdensityresultsfromaLaB6thermioniccathodeelectrongun[J].IEEETransactiononPlasmaScience,1990,18(6):9921001.[5].[M].:,1978.(DepartmentofPhysicsofZhongshanUniversity.Constantofphysicsandchemistryofrare2earth.Beijing:MetallurgyIndustryPress,1978)[6],,,.2kW[J].,2003,15(12):12411244.(LiSQ,ShenLG,YaoJP,etal.Simulationandoptimizationofcoolingsystemfor2kWaccelerator.HighPowerLaserandParticleBeams,2003,15(12):12411244)[7]DudnikovV,FarrellJP.Ionsourcewithhighemissioncurrentdensitybeamproduction[A].IEEEInternationalConferenceonPlasmaScience[C].1998.249.[8]TouloukianYS,DeWittDP.Thermalconductivity:metallicelementsandalloys[M].NewYork:IFI/Plenum,1970.[9]FujisawaT,HirashimaT,KatoriT,etal.CompactRFacceleratorforelectronbeamirradiation[J].NuclInstrMethB,1997,124(1):120127.[10],,.[J].,1999,11(1):610.(MaYY,ChengZH,ZhangYN.Thefiniteelementmethodinthermaldeformationanalysisofhighpowerlaserwindows.HighPowerLaserandParticleBeams,1999,11(1):610).Digitaldesignforstructureofcathode/gridassembliesinelectroncurtainacceleratorCAOLei1,SHENLian2guan1,HONGYi2ling2,PEIYuan2ji2(1.DepartmentofPrecisionMachinery&PrecisionInstrumentation,UniversityofScienceandTechnologyofChina,HeFei230026,China;2.HefeiNationalSynchrotronRadiationLaboratory,UniversityofScienceandTechnologyofChina,P.O.Box6022,HeFei230029,China)Abstract:Thefiniteelementmethod(FEM)isintroducedtodesignastructureofcathodegroupwareforanelectroncurtainaccelerator.AnoptimumstructureofgroupwareandparametersofitsheatsourceWwirehavebeendesigned.Anuniformtemperaturedistributionof14001430onthenarrowplanarLaB6cathodehasbeenpredicted,whichisenoughtoemitsufficientelectronbeam.Inordertoinsureexactthermalphysicalparameters(suchasheatemissivityandheatconductivity)ofallthematerials,anadditionaliterativealgorithmisadopted.Ittakesonlyfouriterationstogettheconvergentresult.Themethodmakesanalysisprocessmoreefficientandcompact.Experimenthasprovedthevalidity.Keywords:Finiteelementmethod(FEM);Cathodes/gridassemblies;LaB6;Thermicemission;Optimizationdesign884116©1995-2005TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.