January 15, 2014 Calibration

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Meeting Time and Place

Wednesday January 15, 2013 at 11:00am At Jefferson Lab, the meeting will be held in F326


To connect from the outside, please use ESNET

  1. ) ESNET: 8542553
  2. )To connect by telephone, dial:
  • You can look up toll-free number at http://www.readytalk.com/intl
  • US and Canada: (866)740-1260 (toll free)
  • International: (303)248-0285 (toll call)
  • enter access code followed by the # sign: 3421244#


  1. Announcements
  2. Status Update
  3. Tracking
  4. Calorimetry
  5. Other systems
    • TOF
    • Start Counter
  6. Simulations and Calibrations


Attending: Sean, Amiran (NU); Lubomir, Simon, Beni, Eugene, Mark, David L., Mark D. (JLab); Curtis (CMU); Justin (MIT); Eric (FIU)

  1. Announcements
    • A new version of the CCDB has been released, which includes better online help and the ability to track which users make changes to the DB.
    • Justin reported that the software review suggested that the software trigger could be used to tag events to be used for calibrations. It would be useful if the detector groups could think of what types of events they would like saved so that he can start thinking about what trigger algorithms would be needed.
  2. Status Update
    • Sean will add more tables as soon as he can get the new version of CCDB working.
  3. Tracking - Simon reported progress with CDC & FDC alignment using a modified Kalman filter with straight track events.
    • For the CDC, he tried estimating the t0 directly from the CDC instead of using the BCAL, and found that the results were not as good but were perhaps good enough to use as seed values for later iterations. CDC results using wire offsets with more "realistic" amplitudes and more frequent variations were found to have acceptable initial results, but more study of them is needed.
    • For the FDC, an initial attempt was made to align the wire planes using simulated beam data with the magnetic field turned off. Good results were found, except for the first package. Moving the target farther from the FDC improved the results. Currently, single muon events are thrown, next is to look at actual bggen events.
  4. Other systems
    • The start counter group is looking at some data they have taken, and are in the process of determining the needed calibrations.
  5. Simulations and Calibrations
    • Curtis reported that the software review emphasized the importance of testing calibration/alignment procedures on simulated data.