Sep 24, 2015 Calorimetry

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Meeting Time: 11:15 a.m. (new time!)

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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. Consider developing data structures for the peak value (Mike and Mark) Mike completed this task and checked into git
2. Produce plot of z-position resolution (George). See minutes

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. GlueX Collaboration Meeting October 8-10
4. Commissioning
   1. FCAL Update
   2. BCAL Update
5. Reconstruction and Simulation
6. Calibration
   1. Coefficients (Andrei): Media:mu_decay_e_total.pdf and Media:mu_decay_e_cell.pdf
   2. TDC offsets
      • BCAL - z-position resolution (George)
      • email from elton
   3. Event Tagging (Sean, all)
7. Any other business

Minutes

Attendees: Mark, Matt, Adesh, Eugene, elton (JLab), Sean (NWU), George (Athens), Curtis, Will M., Mike (CMU), Andrei, Zisis (Regina)"

1. Announcements
2. Action Items
3. GlueX Collaboration Meeting October 8-10
4. Commissioning
   1. BCAL Simulation (Mark)
      • Evaluating response of single photons in MC at fixed angle and energy.
      • Check to see how well photons are reconstructed
      • Close to finishing project when setup was updated to new software. Finds that updated software gives many more clusters at lower energies and this is not understood. Further checking is needed and Mark will consult with Will, who has recently updated the clusterizer code to include single-ended hits.
      • General observation 1:
        • Small angles (less than 15 deg), significant leakage ~40% found.
        • Eugene inquired about gain factors (data) vs z. Will: No significant effect found in the pi0 reconstruction
      • Comprehensive data set for mono-energetic photons will be posted soon
      • Zisis: early leakage studies show leakage at 14 deg between 6-12%. Eugene: recalls similar numbers from some early MC geometries
      • General observation 2:
        • Distributions widened about 25 deg. This is likely due to the material in the FDC
   2. BCAL const (Mark)
      • Attenuation and up/down gain anomalies seen in recent analysis have disappeared after rejecting late hits in the analysis
      • Kei is launching this weekend and all runs will be processed again. New constants should be available next week.
   3. FCAL Hardware

1. 1. • Between 30-40 bases are problematic, with voltage readback as zero after few hours of operation.
2. Reconstruction and Simulation
3. Calibration
   1. Coefficients (Andrei): Media:mu_decay_e_total.pdf and Media:mu_decay_e_cell.pdf
   2. TDC offsets
      • BCAL - z-position resolution (George)
      • email from elton
   3. Event Tagging (Sean, all)
4. Any other business