BCAL Reconstruction Meeting 2014-12-12

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Video Conferencing Information

Meeting Time: 11:00 a.m. EDT

  1. To join via a Web Browser, go to the page [1] https://bluejeans.com/907185247.
  2. To join via Polycom room system go to the IP Address: (bjn.vc) and enter the meeting ID: 907185247.
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Participant Direct Lines

  • JLab Phone: in CC F326 is 757-269-6460 (usual room)
  • JLab Phone in CC L207 is 757-269-7084
  • Phone in the Regina Video-conference Suite is 306-585-4204


  1. BCAL Reconstruction Issues
  2. BCAL Reconstruction Algorithms
  3. Will's reconstructed energy info

Action Items

  1. Ask Richard Jones about Truth info from BCAL hadronic showers (Zisis, Will L., Justin)
  2. Shower curvature tables: compare KLOE to IU codes: check gap in cluster handling between codes (Tegan, Andrei)
  3. z-coordinate determination from up/down amplitude ratio (Tegan, Andrei)
  4. Cleanup: (Tegan, Will L.)
    1. Set variable “failures” to a number other than zero (e.g. -9999 or similar)
    2. Comb code for constants to be pulled out into a database
  5. Measure data pedestals using LV=0 setting (Mark)
  6. Sampling fraction tables (Tegan)


  1. Announcements
  2. Action Items
  3. Updates
    1. BCAL Commissioning
    2. BCAL Calibration
    3. BCAL_analysis_update (Will)
    4. Simulations
  4. Any other business


Attendees: Elton, Mark, Will M., Tegan (JLab), Will L. (CMU), Andrei, George Vasileiadis (Athens), Zisis (Regina)

  1. Announcements: George Vasileiadis will be rejoining us early in the new year. Our group needs to organize and priorize the tasks so suitable ones can be found for Athens in Reconstruction and/or data quality checks.
  2. Action Items: defer until our next meeting in the New Year
  3. Updates
    1. BCAL Commissioning:
      1. Mark has put the BCAL constants in ccdb and the code has been adjusted to work with these (both on ifarm and gluon).
      2. Run plan: we will run at 12 C until Tuesday, then go to 24 C for some data, and then return and stay at 12 C on the chiller, since it seems to operate quote stably there.
      3. Threshold has been lowered from 110 to 105. Eventually we might want to push it as low as is reasonable. After we look at the pedestals from the 12 C data we can rdiscuss this and decide.
    2. BCAL Calibration: Special meeting called at 2pm EST for later today do deal with this. Elton has a draft document (GlueX-doc-2618).
    3. BCAL_analysis_update (Will)
      1. Will presented analysis following the implementation of Andrei's calibration coefficients. The pi0 mean (fit parameter p4) is now at 159 MeV invariant mass with a sigma (p5) of 17 MeV. The MeV/cm plots show a mean value of 10 MeV/cm for the inner layer and about 14 MeV/cm for the outer ones. Will M. also discussed possibly implementing shower correction factors seen by Will L. in the Monte Carlo. These appear to arrange between 5-10%.
      2. Andrei pointed out that the "-1" values in his fit results should be replaced with reasonable values for those failed fits. He recommended 0.006 for the outer layer and 0.005 MeV/ADC count for the 3 inner layers. Note that the bigger values of these calibration coefficients point to a lower gain. Light guides are different in the outer layers, and one possible difference is the effective capacitance on the readout assemblies affecting the summed boards' gain and possibly rendering it different than, say, the inner (single) layer. This effect should eventually be included in Andrei's coefficients in ccdb and if needed we can bring it up with Fernando.
    4. Simulations: nothing to report
  4. Any other business:
    1. We discussed taking as much cosmics as possible with the solenoid off. Dec 22-23 (accelerator off to lab shutdown) may be a good opportunity. We want to analyze the results before we make detail plans for cosmics data taking in January (possibly with BCAL self triggering). We also want to investigate whether the 12 C requires different calibration coefficients in a relative manner, due to possibly having non-uniform 56 mV/deg factors in the MPPCs.
    2. Remote data taking is not practical. Sooner or later DAQ experts will be needed, but overall DAQ progress has been great.