Meeting time and location:

ECAL maintenance and performance during the run
- ECAL scalers before the accelerator maintenance day [1]
- Checking ECAL modules [2]
- Issue with the FCAL HV module [3]
- Flash ADC scalers during first beam [4]
- Two modules fixed during the accelerator maintenance day [5]
  - ECAL scalers after maintenance day (production at 100 nA on 4.5x10^-4 Al radiator) [6]
- Commissioning of the ECAL trigger [7] [8]
- Issues with the readout crate during two first two production nights [9]
Calibrations
- First look at Compton scattering events in the ECAL [10]
- ECAL/FCAL energy and timing [11]
- ECAL coverage with 2-arm Compton [12]
- Pi0 calibration [13]
Monitoring
Restoring PS test setup [14]
- Assembling PS prototype [15]

Minutes

Attendees: Sasha, Bill, Yuyao, Olga, Drew, Besha, Vlad, Payton, Axel, Jane, Igal, S.T.

ECAL HV has been updated using Compton events
- Individual HV settings for 146 modules
- Increased HV for most channels
- Set energy scale for FADC: 2.8 MeV/ADC count
Maintenance day: used LMS to check detector
- Found and fixed one hot channel and a couple other suspicious channels
Trigger timing between ECAL and FCAL has been adjusted
π0 calibrations under way
- π0 peaks clearly seen in most channels, but not seen for ~10% of ECAL channels
- Trying to understand missing peaks -- scalers look good, baselines are fine, not trigger problem...
- New simplified peak fitting procedure
- TOF not properly in time, needed for veto

JEF meeting, April 18, 2025