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1、DetectorUpgradeR&DoftheCMSHadronicEndcapandForwardCalorimetersUgurAkgun(fortheCMSCollaboration)35-2-1Abstract–TheCMSHadronicEndcap(HE)andHadronicreaching10cmsin2023[8,9].TheacceleratorluminosityForward(HF)calorimeterscoverthepseudorapidityrangeofupgradewillrequireCMSHEcalorimetertobemodif

2、iedforfrom1.4to5onbothsidesoftheCMSdetector,contributingtohigherradiationconditionsaswell.TheCMSHEcalorimetersuperiorjetandmissingtransverseenergyresolutions.Hereweconsistsof19layersofscintillatortilessandwichedbetweendiscusspossibleupgradescenariosforbothcalorimeters.Recent70mmbrassabsor

3、bers.Lightgeneratedinthesescintillatorsstudiesrevealedabnormallyhighamplitudesignalsduetopunch(KuraraySCSN81)iscarriedtohybridphotodiodesbythroughchargedparticles,mostlymuons,producingCherenkovKurarayY-11doublecladwavelengthshifting(WLS)fibers.photonsattheHFcalorimeterPMTwindow.Ourstudies

4、showBothscintillatorsandWLSfibershavebeenshowntobethattheseeventscanbeeliminatedeitherbyusingthetimingproperties,orreplacingtheHFPMTswithnewgenerationfourmoderatelyradiationhardupto2.5Mrad.ThesimulationanodePMTs.AstheintegratedluminosityoftheLHCincreases,studiespredictradiationlevelsupto1

5、0Mradinhighηtowers.thescintillatortilesusedintheCMSHadronicEndcapThisvaluereachesupto30Mradforthefronttowerswherecalorimeterwilllosetheirefficiency.ThisreportoutlinestwotheElectromagneticEndcap(EE)calorimeterdoesnotshieldpossibleradiationhardupgradescenariosbasedonreplacingthetheHEcalorim

6、eter[10,11,12].AsasolutiontothisradiationHEscintillatorswithquartzplates.damageproblem,weproposetosubstitutethescintillatorswithquartzplates[13,14,15].Inpreviouspapers,wereportedresultsfromradiationhardnesstestsonvarioustypesofquartzI.INTRODUCTIONmaterialintheformoffiber.Resultsshowthatqu

7、artzcanTHECompactMuonSolenoid(CMS)[1]isageneral-withstandtheradiationdosesofupto1.25Grad[16,17].HerepurposedetectordesignedtorunatthehighestluminositywesummarizethestudiesperformedontwoscenariosbasedprovidedbytheCERNLargeHadronCollider(LHC).Theonquartzplates:i)Cover