Feb 23, 2017 Calorimeter
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Contents
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
Action Items
References
Tentative Agenda
- Announcements
- Action Items
- Run preparations
- Fcal Shift Information (Fcal)
- Log Entry 3461536 Monitorng (Ahmed)
- FCAL update
- BCAL update
- Preliminary Energy Resolution plots - George
- Calibrations
- pi0 calibrations
- Bcal timing calibrations
- Reconstruction and Simulation
- Log Entry 3461457 Shower containment (Will)
- NIM articles
- Any other business
Minutes
Attendees: Elton, Zisis, Adesh, Mark (JLab); George, Georgios, Christina (Athens); Will, Curtis (CMU); Ahmed (UofR); Matt (IU)
- Announcements
- Action Items
- Run preparations
- Fcal Shift Information (Fcal)
- This page is out of date. Jon will update it.
- 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.
- 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.
- 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.
- Fcal Shift Information (Fcal)
- 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.
- BCAL update
- 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.
- Preliminary Energy Resolution plots - George
- Calibrations
- pi0 calibrations
- Bcal timing calibrations
- Reconstruction and Simulation
- Log Entry 3461457 Shower containment (Will)
- NIM articles
- Any other business