Dec 1, 2016 Calorimeter

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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

• Produce documentation for implementation of timing algorithms and constants (Andrei)
• Andrei to send reference to Will for BCAL_mevPerPE constant Send a couple of weeks ago
• Will will extend the range of the plot for simulated resolutions to higher energy (e.g. 5 GeV) Updated Log Entry
• Check that the charged track extrapolation inside the BCAL follows the magnetic field. The tracking is following tracks through the magnetic field.

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
4. FCAL update
5. BCAL update
6. Calibrations
7. Reconstruction and Simulation
   1. BCAL Clustering charged particles try1 (Will M.)
8. Any other business

Minutes

Attendees: Elton, Jon, George, Adesh, Mark (JLab); Matt (IU); Christina (Athens); Curtis, Will (CMU); Andrei (UofR)

1. Announcements
   • Accelerator is running smoothly for Hall A at 5 pass. The decision has been made not to reinstall the separator cavities during the run. We have requested to get at least on week of beam before the shutdown.
2. Action Items
   • Several items completed.
3. Run preparations
   • Long cosmic-ray run completed over Thanksgiving. Beni is planning to take more comics this weekend.
   • We should check that LED pulsers are on for both Bcal and Fcal.
4. FCAL update
   1. Bases (Jon)
      • Matt stresses that Chris should diligently continue repairing bases
      • Chris is repairing about 5 bases per day.
      • Identified the first verified case of a bases with nominal fixes (by Chris) has failed after about 60 hours of testing
      • Base has rebounded on its own. Waiting for continuous failure to remove from test setup and let Chris diagnose failure.
      • Fernando continues to check design for possible weaknesses.
   2. Studies using omega decays (Jon)
      • Work in progress
      • Updated software has been used to look at omega->pi+pi-pi0, pi0->g(g), and omega->pi0(g) and compare with previous results
      • Considerable improvement in the use of the kinematic fit for those reactions
      • Mark: Can one also look for bachelor photons? Yes, but completed yet
      • Curtis: What is the beam energy selection? Eg selection is 8.1-9GeV. Could expand to lower energies and increase statistics
      • Mark: What was the confidence level cut? CL cut is 1%.
5. BCAL update
6. Calibrations
7. Reconstruction and Simulation
   1. BCAL Clustering charged particles try1 (Will M.)
      • Will has completed a nice study of possible clustering strategies for charged particles.
      • Initial algorithms did not perform much better than the existing neutral clustering.
      • Plan to investigate clustering based on empirical shower shapes.
      • Feedback is welcome on the posted log entry
8. Any other business
   • George is looking into the pi0->ge+e- decay for calorimetry studies as well as an easy rare decay.
   • With the reduction in the accelerator schedule, we should devote effort to completing NIM articles for the Bcal and Fcal.