alternative connection scheme for pmts in large, low energy lxe detectors论文

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1、AlternativeConnectionSchemeforPMTsinLarge,LowEnergyLXeDetectorsAlternativeconnectionSchemeforPMTsinLarge,LowEnergyLXeDetectorsABSTRACTThemainpurposeofthisthesisistoinvestigateanalternativeconnectionSchemeforPMTsinlarge,lowenergyLXeexperiments.PMTsplayanimportantroleinlargedetectorsnowadays,sincethe

2、yprovideahighefficiencylightreadout.Therefore,thenumberofPMTsusedinsuchdetectorsisincreasingdramatically.Asaconsequence,thenumberofthesignalandHVcablestotheoutsideworldbecomesmoreproblematic;feedthroughsandconnectorsaredifficulttorealizewithinlimitedspaceofthedetector.Furthermore,airandimpuritiesth

3、atcouldbetrappedbythecoaxialcablesthenreleasedinthecleanvolumeofthedetector.Thisforsurehasaharmfulimpactontheresponseofthedetector.Theproposedconnectionschemeholds32PMTsincludingtheHVandsignalcablesina2”wide,0.004”thickflexibleKaptonstriplines.Inthiswork,thePMTsignalusing1.5mlongunshieldedstripline

4、iscomparedwiththesignalusingcoaxialcableofthesamelength(conventionalscheme).MinimalchangestothePMTbasearerequiredwithoutanyriskofadditionalimpuritiesorradioactivity.Thesignalqualityiscompatibleandintroducesthenewschemeasapromisingsolution.TheHVconnectionscanbeeasilyrealizedwithoutadditionalcapacito

5、rsonthebasebygroundingthesecondbutlastdynode.Thissatisfiesthestriplinespecificationsbyreducingthevoltageontheanodetolessthan300V.ThecathodeandtherestdynodesareconnectedtonegativeHV.Thecrosstalkwastakenintoconsideration.Finally,thisnewschemepreservesthepossibilitytoadjustthegainofeachPMTindividually

6、anddoesnotcausecrosstalk.Keywords:Instrumentoptimization;Instrumentnoise;DarkMatterdetectors;Specialcables.I万方数据AlternativeConnectionSchemeforPMTsinLarge,LowEnergyLXeDetectors©2015ElsiedAhmedAllrightsreservedII万方数据AlternativeConnectionSchemeforPMTsinLarge,LowEnergyLXeDetectorsContentsABSTRACT.ICopy

7、rightsIIContents.III1.LiquidXenonasanActiveMediumforRadiationDetection.11.1.LiquidXenon(LXe)asaDetectorMedium.11.2.PropertiesofLiquidXenon.21.2.1.PhysicalProperties.21.2.2.ElectronicStructure.51.2.3Scintill