第十二章排队论(运筹学-上海电力学院,施泉生

3012200612HIGHENERGYPHYSICSANDNUCLEARPHYSICSVol.30,No.12Dec.,2006*1)2)(100049),,.,,.S1,[1,2][3],,(LINAC),[4|6],[7,8](BEPC),[9],(PADB)(CDB)(SPALS)(TOF){(SAMOC)3£10¡7Pa,100Gauss,10%,16m.(2.5ns,12.5pps),,1.6£105e+/s,Á15,(FWHM)»10eV[4,10](BEPC),,,108e+/s,.1,,.(Penning-Trap,P-T),2006{03{10*(10475096)(U-37)1)E-mail:[e-mail]2)E-mail:[e-mail]1196|1199121197,.,0.1|30keV..,.2,,,,PT,,[4,9,10].1.1()3£10¡7Pa(10%)»100Gauss()98%(BEPC)»6:5£105/s»1:8£105/s(GEM-HPGe)»5600cps85|88eV(FWHM)1:0eV(IP)15mm()0|¡30keVGEM-HPGe,.,7mm,22Na,.2,10%.1.85¹Ci,1:85¹Ci£3:7£1010e+=mCi=6:85£104e+:2GEMHPGe6cm,9cm,12cm,17cm,2.,1.8£105e+/s.,5mm,5000cps(1).2/cm691217/cps760451267137/cps22001150730380/(105e+)1.981.741.871.9,,(FWHM)Penning-Trap,[11].,,,,.3,.85|87eV,»§1.0eV.3±.IP,IP[12,13].10¡5Pa,Vg63V,IP¡14kV,2400s.,.25¹s£25¹s,,.4DC(a)(b),,15mm.IP,.,IP1198(HEP&NP)30,,(MCP),..4IP(a),(b)3°,SW,.,,[11],,SW,[5].5.(ps),,0.511MeV°.GEMHPGe°,,S.5.,,,.22Na,0.511MeV°S,,6.,,S0.002,°(FWHM)2.72.6±S,H.7S(a)Si;(b)Al(He).,22NaSiAlHe,7.(a)121199SiS,S;(b)AlHeS,S,,.,,,.4,1.8£105e+/s,§1.0eV,15mm.,S,,.(References)1KogelG.LifetimeSpectroscopyinSub-surfaceDefectStudies.Dorikens-VanpraetL,DorikensM,SegersD.PositronAnnihilation.Sigapore:WorldScienti¯cPublish-ingCo.Pte.Ltd,1988.522ManuelAA,SinghAK,JarlborgTetal.PositronAn-nihilationatGeneva:RecentResults.Dorikens-VanpraetL,DorikensM,SegersD.PositronAnnihilation.Sigapore:WorldScienti¯cPublishingCo.Pte.Ltd,1988.1093FischerCG,ConnellSH,ColemanPGetal.Appl.Surf.Sci.,1999,149:221|2264WANGBao-Yi,CAOXing-Zhong,WEILongetal.Mater.Sci.Forum.,2004,445|446:513|5155SegersD,ParidaensJ,VanHoeckeTetal.Appl.Surf.Sci.,1995,85:172|1776HaruoSaito,ToshioHyodo.Mater.Sci.Forum.,2004,445|446:457|4617MasaoDoyama,InoueM,KogureYetal.Appl.Surf.Sci.,2002,194:218|2238WernerTriftshauser.Mater.Sci.Forum.,2004,445-446:452|4569CAOXing-Zhong,WANGBao-Yi,WEILongetal.Nucl.Tecl.,2004,27:435|439(inChinese)(,,.,2004,27:435|439)10CAOXing-Zhong,WANGBao-Yi,YURun-Shengetal.HEP&NP,2004,28:560|563(inChinese)(,,.,2004,28:560|563)11MAYan-Yun,PEIShi-Lun,CAOXing-Zhongetal.HEP&NP,2006,30:166|170(inChinese)(,,.,2006,30:166|170)12YURun-Sheng,WANGBao-Yi,LIUJianetal.Nucl.Tecl.,2000,23:281|282(inChinese)(,,.,2000,23:281|282)13DoyamaM,TerashimaY,OzakiAetal.Appl.Surf.Sci.,1999,149:71|76PerformanceofBeijingIntenseSlowPositronBeam*CAOXing-Zhong1)WANGBao-YiWANGPingMAYan-YunQINXiu-BoWEILong2)(KeyLaboratoryofNuclearAnalysisTechniques,InstituteofHighEnergyPhysics,CAS,Beijing100049,China)AbstractBeijingintenseslowpositronbeamhasbeenconstructedsuccessfully,whichutilizesthepulsedelectronbeamoftheBEPCLINACwithhighenergytoinjectintotheTatarget.Thesystemwillbeusedtoexpandthemethodologyresearchonpositronbeamandtostudythedefectof¯lmmaterials.TherunningperformanceofDCpositronbeamwillbeintroducedinthispaper,suchastheintensity,theenergyspreadandthebeamsize.Asthemainmeasurementmethod,Dopplerbroadeningspectrumsystemofpositronannihilationhasalsobeenaccomplished.Keywordsslowpositronbeam,beamintensity,energyspread,beamsize,positronannihilation,SparameterReceived10March2006*SupportedbyNSFC(10475096)andSpecialFundforEquipmentofCAS(U-37)1)E-mail:[e-mail]2)E-mail:[e-mail]