General EEEMCal Meeting Summary 12/10/21
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PARTICIPANTS: Douglas Hasell, Richard Milner, Carlos Munoz-Camacho, Sasha Bazilevsky, Hamlet Mkrtchyan, Hrachya Marukyan, Crytur-USA, Renee Fatemi, Rosi Reed, Vardan Tadevosyan, Vladimir Berdnikov, Tanja Horn
BEAM TESTS DESY
- Tested 5x5 PWO calorimeter with different readout systems and trigger/triggerless configurations
- aim was to read out two systems at the same time (CAEN+FADC250)
- Identified issues that need to be addressed going forward
- huge changes in gain and pedestals - issue with the JLab FADC250 (induced level shifts on splitter) identified and solution awas to disconnect that system and only read out the CAEN system. Next time aim to have a better solution for the FADC250 system.
- Position scans at different energies from 2 GeV up to 5 GeV
- Next test run planned for May 2-15, 2022
- updated FADC250
- SciGlass scans
- Temperature scans
Q&A
- Gain changes - how observed
- beam collimated to 2mmx2mm - can be positioned at any crystal. Observed a large peak and some runs saw shifted peak and/or two peaks - pedestal also shifted
- Any information on background condition? Anode current?
- PMTs drew 300uA
- How precise is energy known? - what is the
- 10% over 10cm image on collimator (using 2mm collimator should be at ~2% energy spread)
- Dividers
- used custom made
- Any tests with pions?
- only e+/e-
- Energy resolution and temperature scan
- Energy resolution expected best at -25degC
- No magnetic shielding around PMTs
- not needed for experiments envisioned
JLAB
- One 40cm SciGlass block being tested in beam
SIMULATIONS
PRESENTATIONS OF EEEMCAL IN EIC PROTO-COLLABORATION PRESENTATIONS
NEXT MEETING: FRIDAY 14 JANUARY, 2022 AT 8:00AM ET