Hotspot Finder for AtlasDQM Webdisplay

A python script was created for finding hotspots found in the tile and LAr calorimeter Eta, Phi histograms and then finding which hotspots in other histograms were and were not affected by the LAr hotspot. For all purposes of this wiki and the python code itself, hotspots and artifacts are equivalent in usage and meaning.


  • The Python script can be found in: /afs/
  • Example Delta-R_Squared plots can be found in: /afs/


  1. Download
  2. Execute file with either ./ or python artifact_correlator and arguments. Arguments:
    • -h, --help Displays a help message for the script
    • -i, --index A list of index histogram names passed as a string and separated with whitespace
    • -t, --test A list of test histogram names
    • -p, --plot Plots Delta-R, off by default
    • -r, --run_number The run number as a string or int
    • -d, --cut The Delta-R cutoff, default of 0.16

Example Usage

./ -i "Global/HotSpotFinder/Detectors/Tile/tileCellEneEtaPhiSampAAnyPhysTrig@HotSpotFinder Global/HotSpotFinder/Detectors/Tile/tileCellEneEtaPhiSampBAnyPhysTrig@HotSpotFinder" -t "Global/HotSpotFinder/Objects/Jets/OccupancyEtaPhi@HotSpotFinder Tau/tauPhiVsEta" -r 281385 -d 0.17

Code Structure

Currently, artifact_correlator is divided into 4 main section: Global, artifinder class, artifact class, and executor

  • The Global section is where global variables used by the script are generated such as RUN_NUM, SRC, STREAM, HISTOS, and INDEX_HISTOS
  • The artifinder class contains all of the methods used to correlate the hotspots found in INDEX_HISTOS and those found in HISTOS
  • The artifact class is a convenient object class to store the information generated by get_dqmf_all_results
  • The executor is where an instance of the artifinder class is created using information from the Global section. Methods found in the artifinder class can then be called on the object instance.

Importing for Other Uses

  1. From import artifinder, artifact
  2. Create artifinder object in the form of artifinder(INDEX_HISTOS, TEST_HISTOS, STREAM, SRC, RUN_NUM, D_SQUARE_CUT)
  3. artifinder.find_artifacts() will return a list containing the names of the histograms affected by the index histograms

Planned Changes

  • Add default Loose and Tight cut values
  • Add cold spot finder algorithm
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Topic revision: r5 - 2015-11-17 - ThomasCartwright
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