Experiment堪萨斯服务器

KANSASSTATEUNIVERSITYIrakliChakaberiaWilliamBadgett,JuanAntonioLopez-Perez,KaoriMaeshima,ShoMaruyama,AronSoha,BalysSulmanas,ZongruWanComputinginHighEnergyandNuclearPhysicsMay2012NewYorkUnitedStatesAbstract:TherateofperformanceimprovementsoftheLHCatCERNhashadastronginfluenceonthecharacteristicsofthemonitoringtoolsdevelopedfortheexperiments.
WepresentsomeofthelatestadditionstothesuiteofWebBasedMonitoringservicesfortheCMSexperiment,andexploretheaspectsthataddresstheroughly20-foldincreaseinpeakinstantaneousluminosityoverthecourseof2011.
Web-BasedMonitoringisasuiteofmonitoringtoolsessentialforefficientoperationsoftheCompactMuonSolenoid(CMS)experiment.
InformationisprovidedtotheWBMserversfromtheLargeHadronCollider(LHC)andCMSviaspecializedhardwareusingvariousmessagingsystemsandOracledatabase.
Aggregateddataisconvertedtouser-friendlytablesandplotsofcorrelatedinformation.
NewDevelopmentsinWebBasedMonitoringattheCMSExperimentFillReportFillReportprovidesuserswiththeonlinemonitoringofthecrucialcomponentsoftheongoingLHCfill,aswellasarchivalinformationforallpreviousfills.
Thereportpageofeachfillprovidesplotsofimportantquantities(instantaneousandonlinemeasuredintegratedluminosity,backgroundmeasurements,vacuumpressure,collimatorpositionetc…).
SummaryTableprovidesthenumericalvaluesforthosequantities.
PlotsaregeneratedontheWBMserver,usingC++codewithROOTlibraries,andprovidedtotheuseras.
gifgraphicsfiles,thuseliminatingtheusersidequeryingthedatabaseandoptimizingthespeedandperformanceoftheweb-service.
DataSummaryContinuedDataSummary,aswellasFillReport,trackstheshownquantitiestoprovidetheinformationaboutrecordvalues(highestinstantaneousluminosity,mostdatacollectedduringday,weekormonth,etc.
).
UserscandrilltothedetailsofeveryfillandCMSrunfortheparticulartimeperiodorfortherunwiththerecordvalues.
Figureshowsthesummaryofdatatakingduringyearof2012andthetablewiththerecordvaluesforthisyear.
Summary:Intheexperimentwithchallengingamountofinformationtobemonitoredandanalyzed,WBMmanagestoreceive,storeandpromptlydeliverthecrucialinformationtotheCMScollaborationanytimeandanywhere.
Providingtheonlinemonitoringofcorrelatedinformationofdiversesourcesisextremelyimportantforefficientandqualitydatataking.
Developingnewmonitoringservicestomeetthedemandofrapidlyincreasinginstantaneousluminosity,WBMprovedtobeoneofthekeyelementsofsuccessfuloperationoftheCMSexperiment.
Acknowledgements:WewouldliketothankallofourCMScolleaguesfortheircontributionstothisworkandfundingagenciesfortheirsupport.
Specialthankstheruncoordinationteam,centraldataacquisitiongroup,triggerandsub-detectorgroupsfortheircollaborationandfeedback.
Left:WBMmainpagewithalltheservicesRight:SimplifiedviewoftheWBMsystemarchitectureDataSummaryEfficientdatatakingonalongertimescaleisveryimportantinhighenergyexperiments,whicharedrivenbytheamountofqualitydata.
WBMprovidesveryconciseweb-servicecalledDataSummary,whichshowsprogressofdatacollection,trendofinstantaneousluminosityandefficiencyofdatatakingondaily,weekly,andyearlybasis.
FigureshowssummaryoflastthreeweeksofdatatakingwithCMSdetector.
TriggerRatesMonitoringTheLHCproducesveryhighenergybeamsatveryhighluminositiesleadingtohighratesofdataproduction.
TriggeringisextremelyimportantandnecessarypartoftheCMSexperiment.
MonitoringthecomplexCMStriggersystemishighlydemandedWBMservice.
Trigger-Historyperformsfittingforlevel1(hardware-based)andhighleveltriggers(software-based)dailyduringcollisionruns.
Itprovidesaplotofthetriggercrosssection,whichisdefinedastriggerratedividedbyinstantaneousluminosity.
PlotshowsLevel1triggerbitsforp-prun.
LevelonetriggerratesaremonitoredonlinebycheckingagainstexpectedratesfromthefitresultsoftheTrigger-Historyapplication.
Oneofthegoalsofthisserviceistoassistexpertstounderstandinstantaneousluminositydependencefortriggermenudesign.
Inadditiontotriggercrosssection,therateandratiooftriggerscanbeplottedforlevelonetriggerbits.
PlotshowsdifferentL1triggerratesforaparticularCMSrunPCsUSERSDATABASEPCsLHC