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TheCMSexperimentattheLHC—designand
initialperformance
CHAPTER1
Author’scontributiontothissubject
Theauthoractivelyparticipatedinvariousphasesofdesign,hardwaredevelopmentandconstructionoftheCMSexperiment.
TheauthortookakeyroleintheRPCtriggersystemdesign,beingforalongtimeresponsibleforsystemsimulation,worked
onsystemconstructionand,asacoordinator,tookmajorresponsibilitiesincommissioning,operationandmaintenanceof
thefullsystem.
TheauthorhasalsoparticipatedinbeamtestsandcommissioningofthePixelDetectorandbecamethemainauthor
ofthereconstructioncodethatconvertsrawdatadetectorformattodigitizeddataformatsuitableforfurtherreconstruction.
DuringLHCstartupandsoonafter(until2010)theauthorwasofficiallyresponsibleforthiscode.
TheauthorhasalsodevelopedtheRPCdataconversioncodeandmaintainedtheDAQmodulefortheRPCdata
readout.ThecommissioningoftheRPCdetectorincludedparticipationinseveralpreparatoryruns,beforeandafterLHC
startup,butalsoaseriesofrunsdedicatedforRPCsub-detectorunderstandingandinitialimprovements.
TheauthorwasalsoactivelyparticipatinginCMSdetectordatatakingandqualitymonitoringofthetriggerdata.
Duringthepreparationandregulardata-takingperiodtheauthorwasaRPCtriggershifterandon-callexpertaswellasa
Level-1triggershifter.Inbothcasestheauthorwasresponsibleforsub-detectorpartanddataqualitymonitoring.During
selectedrunstheauthorwasalsotheLevel-1Detector-On-CallexpertresponsibleforoperationoftheentireLevel-1trigger.
TheCMSresultsdescribedinthisChapterwerepresentedbytheauthoronbehalfoftheCMScollaborationat
internationalconferencesasinvitedtalks[16,17].TheseconferencecontributionsarerevisedandupdatedinthisChapter.
1.1.Introduction
OrganizationforNuclearResearch)inGeneva,Switzerland.ThefourmainexperimentsattheLHC
providefrontierphysicsresults.Initsmainmodethemachineisdesignedtocollideprotons.The
machinecenter-of-massenergywas√s17TeVin2010and2011,and√s18TeVuntiltheendof
2012,whenproton-proton(pp)runsintheperiodofLHCRun-1ended.Itisexpectedthatatthe
beginningof2015theLHCwillresumeitsoperationwiththeenergyof√s113TeV,whichisclose
tothedesignvalueof√s114TeV.
Run-1.Thedeliveredstatisticsofabout30fb
theHiggsparticle[24–26]—fundamentaltounderstandSpontaneousSymmetryBreakingMechanism
chapterforeasierreading.
2AllthepresentedfiguresshowtheresultsoftheCMScollaboration.Wheneverappropriateamoredetailed
referenceisgiven.