【導讀】Someassumptions…<L>=1031cm-2s-1;EventFilterrate=100Hz;(108events. T=106s;L=10pb-1;Triggermenu. Calibrations. Dataprocessing. Physics. Ratesareindicative!mu6GeV(2%)10Hz. mu20GeV4Hz. E/gamma15GeV25Hz. JetpT>150GeV6Hz. MissingEnergy(40GeV)+jet40GeV30Hz. MinimumBias(prescaled)&Monitor10Hz. systems;–Testpulses;–Radiactivesources;–Cosmicruns(end2020—beg2020);SCT:4000modules,6millionchannels. physics?data…minr-?200?m. 3mmoftheoretical. 1mradwrtbeamline,<1mradtosolenoid. Trackfindingwith?asinstalled‘alignment. –Misalignallmodules(SCT/pixel)by?(module?structure). m. 94%efficiencyfor?local?misalignments. –With500?mRMS,seriousdegradation. Calculater-?2?mandSCTto2-3?m

　　

【正文】 Filter ~ T0 ~5MSI2k UK Regional Centre (RAL) US Regional Centre French Regional Centre Italian Regional Centre Sheffield Manchester Liverpool Lancaster ~ Workstations 10 GB/sec 450 MB/sec 100 1000 MB/s ?Some data for calibration and monitoring to institutes ?Calibrations flow back Each Tier 2 has ~25 physicists working on one or more channels Each Tier 2 should have the full AOD, TAG amp。 relevant Physics Group summary data Tier 2 do bulk of simulation Physics data cache ~Pb/sec ~ 300MB/s/T1 /expt Tier2 Centre ~200kSI2k Tier2 Centre ~200kSI2k ?622Mb/s Tier 0 Tier 1 Desktop Northern Tier ~200kSI2k Tier 2 ?622Mb/s The Computing System 37 Operation of Tier0 ? The Tier0 facility at CERN will have to: – Hold a copy of all raw data to tape ? Copy all raw data to T1?s for later reprocessing – Keep calibration data on disk ? Store master conditions database here – Run firstpass calibration/alignment and reconstruction ? ESD copy retained on tape – Distribute ESD?s to N external Tier1?s ? (2/N to each one of N Tier1?s。 assume N=10 for now) – Express lines ? Need for calibration line to reduce latency – Might also serve as physics monitoring line ? ?Physics? hotline more contentious – Streaming of ESD and AOD ? Always envisaged to stream AOD into ~10 exclusive streams, collections being built from unions of streams ? Streaming of ESD is required to reduce file access 38 Operation of Tier1‘s and Tier2‘s Tiers defined by capacity, role and level of service No assumption of single site (esp. T2), but must present as a single entity in human/response terms ? We envisage likely 10 Tier1?s for ATLAS. Each one will: – Keep on disk 1/5 of the ESD?s and a full AOD?s and TAG?s – Keep on tape 1/10 of Raw Data, reprocess and retain ESD produced – Keep on disk 1/5 of currently simulated ESD?s and on tape 1/10 of previous versions – Provide facilities for physics group controlled ESD analysis – Calibrations – Support role for defined set of Tier2s ? We estimate ~4 Tier2?s (various sizes, slower response) for each Tier1. Each one will: – Keep on disk a full copy of TAG and roughly one full AOD copy per four T2s – Keep on disk a small selected sample of ESD?s – Provide facilities (CPU and disk space) for user analysis and user simulation (~25 users/Tier2) – Run central simulation 39 Which physics with this data sample? Process Events/s Events in 10 pb1 Total statistics collected at previous experiments by 2020 W ? e? 7x104 104 LEP / 106 Tevatron Z ? ee 104 106 LEP tt?WbWb??? 8x103 104 Tevatron H, m=130 GeV 100 Gluinogluino , m=1 TeV 110 40 Physics ? Study properties of minimum bias events and check with existing data at lower energies. ? Study the muon spectrum。 check inclusive LVL1 muon trigger rates。 ? Check: J/Psi, Ypsilon, W and Z to leptons。 preliminary estimates of production cross sections of W and Z to leptons, with an expected error of ~ 1520% (10% lumi。1015% efficiency) ? Inclusive jet cross section measurement ? Top signal visible? 41 Conclusions The first pp events have many invaluable tasks: ? Subdetectors: – Calibrations, almost always not final, but improved wrt testbeam and cosmics run ? From subdetectors to ATLAS: – Trigger missioning + efficiency – Subdetector integration and event building – Offline missioning ? From detector to results: – Some very preliminary physics analysis: W, Z crosssections, jet spectrum, …