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TPC Online Monitoring Guide P. Christiansen (Lund)

TPC Online Monitoring Guide P. Christiansen (Lund). “Old” online monitors (/ RAW data monitors) Expert pad monitor AliEVE event display Single events No cluster information: only “digits” ALICE QA framework supports online monitoring via AMORE

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TPC Online Monitoring Guide P. Christiansen (Lund)

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  1. TPC Online Monitoring GuideP. Christiansen (Lund) • “Old” online monitors (/ RAW data monitors) • Expert pad monitor • AliEVE event display • Single events • No cluster information: only “digits” • ALICE QA framework supports online monitoring via AMORE • New QA RAW monitor based on GSI TPC calibration framework with simple clustering • Integrates with GUI viewer • Also GUI viewer is now working in AMORE • Average cluster characteristics over many events

  2. Current information(persistent for online mode) • NB! this is an average information for each pad. The monitor is only 2d (pad+row), so there is NO time dependence! • MaxCharge – Qmax • MeanCharge – Qtot • NlocalMaxima – number of clusters • NPads – pad width of cluster • NTimebins – time width of cluster • NoThreshold – fraction of digits above threshold (ZS reduction) • TimePosition – mean Z position of clusters • Other variables can be added, BUT there is an online memory limit on the number of variables so 1 new variable means that 1 old has to disappear

  3. The RAW data QAUpdated February/March 2008 • Simple clustering implemented to have access to cluster characteristics • Raw data are expanded sector by sector in memory • Local extrema are identified • This is a simplified version of the clustering implemented in AliTPCclustererMI • We can then study e.g. the gain (Qmax, Qtot) • Integrated into AMORE online monitoring framework (Filimon and Marian) • Old version tested with online data • New version tested with files on monitoring machine

  4. RAW data QA: Cosmic data from December run, Qmax for A side • Output can be viewed (and manipulated!) in TPC calibration browser online

  5. The noise (not shaped!) can be removed since also the mean number of timebins is available

  6. Qmax requiring mean time bins >2

  7. Qmax requiring mean time bins >3

  8. Q and Qmax plots with cuts

  9. RAW data QA: Krypton data (single clusters) from February in AMORE • Calibration browser (AliTPCCalibViewerGUI) has been integrated in AMORE

  10. How to use offline • Expert pad monitor and AliEVE are documented in: • TPC shift guide • TPC offline manual: $ALICE_ROOT/TPC/doc/offline/ • QA RAW monitor in standalone • In aliroot do: • .L $ALICE_ROOT/TPC/macros/testDataQA.C • testDataQA(<filename>) • NB! currently it runs the QA for both normal and fast reader, but this can easily be changed in the macro

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