General EEEMCal Meeting Summary 12/10/21

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