Mar 10, 2016 Calorimetry

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Meeting Time: 11:00 a.m.

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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
• Athens Phone: in Christina's office is 011-30-210-727-6947

Action Items

1. Update BCAL clusterizer to improve agreement between simulated and generated MC (Mark)
2. Modify covariance matrix for FCAL and BCAL to correspond to the current resolution of the detectors (Matt).
3. Change F250 simulation code to match firmware and add flexibility for new algorithms (Mike)

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book
3. BCAL Action Items and Working Tasks

Tentative Agenda

1. Announcements
2. Action Items:
3. Run Preparations
   1. FCAL Update
   2. BCAL Update
4. Reconstruction and Simulation
5. Calibration
   1. Update on pi0 decay to e+e-g to extract energy resolution Will M
   2. BCAL - Update on Effective Velocities and Time Offsets - George
   3. Instabilities in the Integration of BCAL Pulses - Andrei
6. Any other business

Minutes

Attendees: Elton, Mark, Simon, Will, Ahmed (Jlab);Zisis, Tegan, Andrei (UofR); Sean (NW); George (Athens)

1. Announcements
   • The refrigerator in accelerator was contaminated and repairs options were briefly discussed at the 1:30 planning meeting. However, immediately following the meeting, the CHL crashed and forced the decision to immediately start a week long CHL recovery and maintenance. Initial estimates of restoration of beam to Hall D is next Thu. More information is contained in the Arne's Elog 3390086
2. Action Items:
3. Run Preparations
   1. FCAL Update (update by Elton)
      • Jon and Adesh are currently replacing bases. Base failures continue at about 1 per day and weekly replacements keep dead channels in the data to about half a dozen.
      • Test setup at JLab is underway and should help timely diagnosis of failures and hopefully identify root causes.
   2. BCAL Update
      1. Mark: Event display hdview2 updated with extra window containing timing and z-information for the Bcal. Shows clusters on plot of z vs phi. Useful tool for understanding clusterizer.
         • Will has been working with Mark on identifying where the clusterizer is failing. The new event viewer is helping that effort. So far Will has been scanning MC single photon events to see how they fail. Clusters get split when the reconstructed z position is outside selection limits (DeltaZ > 15 cm). DeltaTime and DeltaPhi selections meet the criteria in the clusterizer. Need to dig deeper to understand the cause for the discrepancies in DeltaZ.
4. Reconstruction and Simulation
5. Calibration
   1. Update on pi0 decay to e+e-g to extract energy resolution Will M
      • Investigating the use of pi0->gamma e+e- events to determine the single photon energy resolution in the Bcal.
      • First set of slides are for inclusive pi0s. He finds several thousand pi0s per 200 MeV energy bin in about 800 files. We should have considerable more data.
      • Exclusive selection of gp->pi0p was also performed. Here only about 200 files were analyzed. Clear pi0 and eta peaks are seen with photons in either Fcal or Bcal. Fewer events found but situation is much more constrained.
      • Further studies are in progress, but it looks hopeful.
      • Sean: Suggests to look at the e/p distribution for the track other than the one which was selected.
   2. BCAL - Update on Effective Velocities and Time Offsets - George
   3. Instabilities in the Integration of BCAL Pulses - Andrei
6. Any other business