Solenoid

1. BNL • CNAF • FZK • Ann Arbor • Rome • Munich Calibration Site CALIBRATION STREAM Data ATHENA CALIBRATION NTUPLE LVL2 RoI 100 M/day CDR DQ2 T0 T1 T2 DQMF Cool DB • Overview directories for each • barrel summary histograms; • sector summary histograms. • 4 directories for each MDT chamber • Chamber: general histograms • DeadStatus: distribution of dead tubes • Efficiency: efficiency per tube • Occupancy: layer profile P1 ~100 GB/day DQ2 MDT DQA Tool in ATHENA ATLR COOL Cond DB ATONR COOL,DCS Calibration Jobs (ATHENA + standalone)‏ ORACLE Streams WEB display HISTOGRAMS file.root EM Calorimeter Solenoid COOL Cond DB Muon Spectrometer <50 MB/day Offline DQMF ORACLE Streams MDT DCS, Alignment MDT DQA Forward Calorimeters Reco Track Drift Circle ORACLE Calib DB MDT DQDatabase ~50 MB/day Inner Detector STOP OK ORACLE Calib DB Residual ATLR New COOL Calib constants ATONR New COOL Calib constants Calibration Site Qualityflags CERN CALIBRATION Barrel Toroid Calibration Constant DQ Endcap Toroid ~10 MB/day CALIBRATION VALIDATION First Beam run 89106 Tile Calorimeter MDT Data Quality Assessment at the Calibration Centers for the ATLAS experiment at LHC M.Verducci (University of Wurzburg), P.Bagnaia, C.Bini, V.ConsortiandE.Solfaroli (University of Rome “La Sapienza” and INFN) on behalf of the ATLAS Muon MDT Collaboration MUON DETECTOR VIEW • Tracker Detectors • Monitored Drift Tube Chambers • Cathode Strip Chambers • Trigger Detectors • Resistive Plate Chambers • Thin Gap Chambers • Toroidal magnetic field in air to minimize multiple scattering. Can operate as a stand-alone detector MDT MUON SYSTEM Muon MDT Spectrometer Performance Muon Spectrometer Requirements • Solid angle coverage • Trigger capability for different muon momenta • Operation in high rate and high background • Good momentum resolution in the range 6GeV-1TeV • The nominal resolution of 80μmon a single hit is required in the coordinate orthogonal to the B-field. Accuracy in the precision of the drift time measurement and of the detector mechanics. • Knowledge of the space-time (r-t) relation • MDT CALIBRATION MUON STREAM • Continuous MDT calibration and alignment are needed to keep all effects under control • Weekly computation of single tube t0 (~20K muon tracks/tube) • Daily determination of the r-t relation of each chamber • ~108 muon tracks each day over the entire spectrometer! • Not achievable using the standard ATLAS Data Flow (muon rate through the 3 trigger levels ~20Hz) Need a dedicated Muon Stream • Muons are extracted from the second level trigger (LVL2), requiring a track in the MDTs pointing to the vertex (~1 KHz) • Data are streamlined and processed in 3 Calibration Centres • Ann Arbor, Munich, Rome; • - ~100 CPUs each. • - ~1 day latency for the full chain: data extraction, calibration computation at the Centres, storage of results in the Condition DB at CERN. Need to carefully design the data flow and the DB architecture. DQMF ARCHITECTURE DQMF WEB DISPLAY • MDT Data Quality Assessment is performed using the “offline DQMF” package (Data Quality Monitoring Framework • Algorithms are applied on ROOT histograms, from the Calibration Stream, in an automated way. • Histograms are compared respect to a reference. • “Standard” and MDT dedicated algorithms are implemented in the package Results and summaries are published on WEB, • stored in the Conditions Database. • DQMF is already used for MDT DQA by shifters at the calibration centers. DQMF tool provides information about: Occupancy, DeadStatus, Efficiency and a global overview of the chamber status. Based on dedicated analysis algorithms, general colour flags are produced to be stored in the Conditions DB.