Feb 23, 2017 Calorimeter

Video Conferencing Information

Meeting Time: 10:00 a.m.

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Participant Direct Lines

• JLab Phone in CC L207 is 757-269-7084 (usual room)
• JLab Phone: in CC F326 is 757-269-6460
• Phone in the Regina Video-conference Suite is 306-585-4204
• Athens Phone: in Christina's office is 011-30-210-727-6947

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 Shift Information (Fcal)
   2. Log Entry 3461536 Monitorng (Ahmed)
4. FCAL update
5. BCAL update
   1. Preliminary Energy Resolution plots - George
6. Calibrations
   1. pi0 calibrations
   2. Bcal timing calibrations
7. Reconstruction and Simulation
   1. Log Entry 3461457 Shower containment (Will)
8. NIM articles
9. Any other business

Minutes

Attendees: Elton, Zisis, Adesh, Mark (JLab); George, Georgios, Christina (Athens); Will, Curtis (CMU); Ahmed (UofR); Matt (IU)

1. Announcements
2. Action Items
3. Run preparations
   1. Fcal Shift Information (Fcal)
      • This page is out of date. Jon will update it.
   2. Bcal environment
      • https://logbooks.jlab.org/entry/3461258 Log Entry 3461258] Bcal humidity is at about 14%. Need to watch it. Tim and Tom have been alerted.
   3. Fcal
      • Base communication issue. Fixed by cycling power remotely. There are also a few FADC channels that are bad and limited FADC spares. Will probably wait till the end of the run to replace electronics.
      • Matt: Asked about monitoring data, as failures may show up here. Occupancy plots may catch most of them. Adesh has not looked at it yet.
   4. Log Entry 3461536 Monitorng (Ahmed)
      • We have found that there are quadrant-dependent shifts (396 channels). We will renormalize to eliminate this as a source of shift.
      • New spring 2017 file has been created for the Log Entry plot. Previously we had been using a file generated for spring 2016.
      • Elton suggested that we take some pulsing data at a fixed voltage (to avoid systematics due to resetting to a specific value). Ahmed will check how many saturation/underflows exist in the present data samples.
      • Ahmed will run his script to plot the standard deviation over the first week of running. Also one needs to investigate outliers in the plots that were shown.
4. FCAL update Log Entry 3460909 (Adesh)
   • pi0 calibration almost complete. Corrected for a shift in the pi0 peak down by a few MeV
   • Propose change to HV tomorrow at the run coordinator meeting. Discussion of changes (Delta HV ~ 10 Volts, but some outliers). Outliers should be inspected.
   • Matt: Notice that there is a number of 2017 gains at one that stands out and should be checked.
   • Status of timing calibration for Fcal is shown on the monitoring plots. Relative to the RF there is a satellite peak at -2n that is not understood.
5. BCAL update
   1. Preliminary Energy Resolution plots - George
      • Showed update on BCAL resolution from pi0->e+e-g events since the collaboration meeting. Preliminary results
      • Plotted dE/E ~ (Pe - Eshower)/Pe (i.e. compared momentum of positron to positron shower).
      • Finds that both BCAL and FCAL shower energies are lower than expected from the momentum determination by about 50 MeV.
      • Matt: Pe at vertex? Yes. Elton: Simon has routines that return the momentum at various detector planes, e.g. front to BCAL and FCAL, which should be used to compare with Eshower.
6. Calibrations
   1. pi0 calibrations
   2. Bcal timing calibrations
7. Reconstruction and Simulation
   1. Log Entry 3461457 Shower containment (Will)
8. NIM articles
9. Any other business