Data Acquisition

Work Flow

When a data taking run is over(typically 8 hours):

Bulk rec uses majority of tier0 resources.

  • AOD: Analysis Object Data, physics output like electrons, muons, tracks, etc.
  • HIST: Histograms for monitoring.
  • ESD: Event Summary Data, contained detailed reconstruction output like calorimeter cells and tracking hits (not produced for physics_main)
  • DRAW/DESD: for selected events.

Calibration Loop over express stream:

  • Histograms to monitor.
  • Alignment work of inner tracker can be done.
  • The beamspot is determined (with new alignment).
Calibration loop (48hrs)



Defects and GRL: take Muon DQ as an example: MyMuonDQTutorial. Good quality of data, 'quality' measured by subdetector performance.

Practical info

Data Streams

Different data stream, coming from different trigger chain, for different purpose

Dataset Nomenclature:


Useful links

-- RongkunWang - 2019-05-03

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