Solenoid

EndcapToroid

EM Calorimeter

Muon Spectrometer

Inner Detector

Barrel Toroid

ForwardCalorimeters

Tile Calorimeter

MDT Data Quality Assessment at the Calibration Centers for the ATLAS experiment at LHC

MDT Data Quality Assessment at the Calibration Centers for the ATLAS experiment at LHCM.Verducci (University of Wurzburg), P.Bagnaia, C.Bini, V.Consorti and E.Solfaroli (University of Rome “La Sapienza” and INFN) on behalf of the ATLAS Muon MDT Collaboration

MUON SYSTEM

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

• Solid angle coverage• Trigger capability for different muon momenta• Operation in high rate and high background• Good momentum resolution in the range 6GeV-1TeV

Muon Spectrometer RequirementsMuon Spectrometer RequirementsMuon MDT Spectrometer Muon MDT Spectrometer PerformancePerformance

The nominal resolution of 80μm on 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

Reco Track

Drift Circle

Residual

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.

CALIBRATION STREAMData

ATHENA CALIBRATION NTUPLE

Tool in ATHENA

HISTOGRAMSfile.root

STOP OK

CALIBRATION

CALIBRATION VALIDATION

MDT DQA

Calibration Constant DQ

Offline DQMF

WEB display

MDT DQDatabase

CalibrationCalibrationSiteSite

Calibration Calibration JobsJobs

(ATHENA + (ATHENA + standalone)standalone)

Calibration SiteCalibration Site

ATONRATONRCOOL,DCSCOOL,DCS

CERNCERN

LVL2 LVL2 RoIRoI100 M100 M/day/day

P1P1T0T0 T1T1 T2T2CDRCDR DQ2DQ2

• BNLBNL• CNAFCNAF• FZKFZK

• Ann ArborAnn Arbor• RomeRome• MunichMunich

ATLRATLRCOOLCOOL

Cond DBCond DB

ATLRATLRNew COOLNew COOL

Calib constantsCalib constants

MDT DCS, MDT DCS, AlignmentAlignment

ATONRATONRNew COOLNew COOL

Calib constantsCalib constants

~100 GB/day~100 GB/day

ORACLEORACLECalib DBCalib DB

ORACLEORACLEStreamsStreams

~50 MB/day~50 MB/day

ORACLEORACLECalib DBCalib DB

~10 MB/day~10 MB/day

ORACLEORACLEStreamsStreams

<50 MB/day<50 MB/day

COOLCOOLCond DBCond DB

MDT DQAMDT DQA

DQMFDQMFCool DBCool DBDQ2DQ2

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.

Overview directories for each barrel summary histograms;sector summary histograms.

4 directories for each MDT chamber1. Chamber: general histograms2. DeadStatus: distribution of dead

tubes3. Efficiency: efficiency per tube4. Occupancy: layer profile

Quality flags

First Beam run 89106

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.

MUON DETECTOR VIEW

MUON STREAM

DQMF ARCHITECTURE DQMF WEB DISPLAY