Revision as of 15:57, 15 November 2018

Meeting Time: 11:00 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

Action Items

1. FCAL: Cross check MC changes by Richard to make sure that gains are not affected in both Geant3 and Geant4 (Matt/IHEP)
2. Fix FCAL online monitoring plugin to properly plot low level digi quantities in 2D displays. 2D display of pedestal is hard to get because occupancy plot is filled in a different loop. (Tolga)

Check:

1. From Mike Staib's work: -cos(phi) type dependence in the data and a phi dependence at the downstream end of the bcal. See Sep 21, 2017 Calorimeter Meeting.

Goals for Calorimetry Group

1. Determine preliminary photon reconstruction efficiencies as a function of E, phi and theta in data and simulation with a point-to-point precision of at least 5%.
2. Measure systematics of pi0/eta mass calibration as a function of detector position to a precision of at east 5 MeV.
3. Demonstrate agreement of photon reconstruction efficiency and resolution between data and simulation as a function of E, phi and theta to within 5%.

References

1. FCAL HDFCAL log book
2. BCAL HDBCAL log book

Tentative Agenda

1. Announcements
   • (Elton) One week of data at low energy (coherent peak at 7 GeV, PS set for 3-5.5 GeV) and low current (40 nA) to check cross sections. Settings are set back to nominal (8.82 GeV coherent peak). Expect to run through Thanksgiving to complete the first GlueX experiment. The accelerator will be down for 3 days to lower energy to 10 GeV and concurrently, Hall D will install the CompCal in preparation for commissioning.
2. Action Items
   1. Tolga: Has downloaded the relevant scripts. Too many events to run via remote login. The structure of the JEventProcessor is similar to plugins, which he is familiar with. Plan to extract pedestals into arrays for processing instead of manipulating histograms. Expect preliminary figures soon.
3. Run Updates
   1. FCAL (Colin)
      • Last 2.5 weeks has seen a drop in dead basis, down to about 2-3/week and is manageable. This may be due to identifying bases with communication issues, which can be fixed by recycling HV. The lower failures may be due to lower intensities of recent running period.
      • Checking signals on some of the inner bases to be ready for CompCal.
   2. BCAL
      • Recently found that the pulser system stopped working for the downstream LED. This was fixed by stopping the pulsing sequence and setting 'continuous' mode by hand for both upstream and downstream. See Log Entry 3626205.
      • Based on online monitoring plots, we see that BCAL and FCAL pi0 calibrations seem to be fairly stable.
      • (Zisis) Ahmed has checked the new pulsing scheme and finds everything in order. Elton: It would be good to have an update at the next meeting, showing average stability over time as well as identification of channels with anomalous behavior.
4. Calibrations
   1. BCAL timing: Mark has calibrated the BCAL timing offsets up to run up to run 51377.
   2. Non linear corrections for pi0 gain_calibrations for the BCAL: An Update File:Non linear corrections update.pdf.
      • Elton comment: Karthik has learned the pi0 calibration process from Tegan and is implementing it on the 2017 data for comparison with Tegan's results. The plan was to use the SiPM saturation code. Initially, Karthik had a branch checked out but it seemed to contain the master files. Once this was fixed, Karthik has started iterating the calibration and constants are indeed changing from before, but converging based on two iterations.
      • (Zisis reported for Karthik who is on shift). Non-linear corrections at each stage are apparent with the new SiPM saturation code, but we expect to reduce the final non-linearity after gains are adjusted to the pi0 mass.
5. Reconstruction and Simulation
   1. Log Entry 3621347 FCAL Non-linear Response in MC (Matt)
      • The current non-linearity corrections in the MC do not seem to match the data. It is unclear what has changed, although Richard did implement a change to HDgeant and HDgeant4 that should have been neutral in terms of gain change.
      • Matt has sufficient MC to find new corrections. Sean: It would be nice to find the origin of changes since the last determination of the non-linearity corrections. Why has this changed? Sean: Also, it could be that the impact of thresholds may change if gains are changed.
6. Monitoring
   1. Radiation Damage in Inner Blocks of FCAL and Image of all inner blocks
7. NIM articles
8. Any other business

Minutes

Attending: Elton, Colin (JLab); Will (CMU); Tolga (FIU); Zisis, Tegan (UofR); Sean (FSU); Matt (IU).

1. Announcements
2. Action Items
3. Run Updates
   1. FCAL
   2. BCAL
4. Calibrations
   1. BCAL timing: Mark has calibrated the BCAL timing offsets up to run up to run 51377.
   2. Non linear corrections for pi0 gain_calibrations for the BCAL: An Update File:Non linear corrections update.pdf.
5. Reconstruction and Simulation
   1. Log Entry 3621347 FCAL Non-linear Response in MC (Matt)
6. Monitoring
   1. Radiation Damage in Inner Blocks of FCAL
      1. Image of all inner blocks
7. NIM articles
8. Any other business