General EEEMCal Meeting Summary 2/21/25

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PARTICIPANTS: Tristan, Carlos, Tanja, Hamlet, Crytur USA, Renee, Matthew Nguyen, Douglas, Gerard, Joerg, Larry, Ioana, Vardan, Sasha, Shihai Jia, Hrachya Marukyan, Crytur CZ, Josh, Artur Hoghmrtsyan, Rosi, Julie,

OVERALL UPDATES

• Started a document on EEEMCAL that may serve as pre-briefing material for final design review and/or publication

• No news on NSF pre-proposal (see notes below)

• Notes from DSC-ePIC meeting on 2/7 posted in Wiki

BEAM TEST DESY - FEBRUARY

• Things going smoothly. A few downtimes but nothing major

• Energy resolution with small collimator (2mm x 2mm) is much smaller than the quoted in the paper, regardless of beam energy

• the number of 150 MeV form the paper was done in T21 test area and with a 18mm x 18mm collimator

• ASIC readout

• 400 SiPMs (16 per channel) - have tested all of them and all are working
• Found some dead channels in the ASICS - re-arranged elements so that all but one SiPM have a working ASIC channel
• Have seen signals and have been running calibrations
• Started with independent (read out each channel individually) readout and have been doing energy (1-5 GeV, no rate at 6 GeV) and position scans (around central crystal) across the calorimeter
• Central crystal with one SiPM gets resolution of ~10% at 1 GeV
• Took data to gain match each of the channels so that can gain match and then
• Can output only one crystal and plugged that into MIT readout with digitizer (not ASIC) - get same resolution as with the ASIC readout
• Finished data taking on the individual SiPM with ASIC readout

• Two more test: 1) 4x4 grouped SiPM, 2) FPGA
• gain test SiPMs individually
• figure out which events are read out in SRO

• Discrete readout

• initial test with single crystal and PMT in beam
• discrete readout boards inserted into Orsay prototype and started tests - saw data on all channels
• Planning to follow run plan for the next few days

BEAM TEST DESY - MARCH

• Start is 24 March

• Actions for preparation:

• Send email to Douglas (hasell@mit.edu) if planning to participate
• Note: if at DESY for the first time need to complete a safety lecture - only offered on Mondays at 1pm local time
• Complete DESY registration form, which will be sent after Douglas registered participants in the system
• Make DESY hostel reservations

• Plan to have beam test preparation meetings in the next few weeks

NSF PROPOSAL

• Due date is still listed as 19 March

• Might be good to reach out to SPOs to say that planning to submit

• Plan to start edits to Overleaf proposal document in the next few weeks

• edit Broader Impacts section and edit language in entire proposal
• edit sections pertaining to timelines etc. that may have changed since the last submission

NEXT MEETING: FRIDAY 21 MARCH AT 8:00AM ET (THERE WILL BE SUBGROUP MEETING ON BEAM TEST AND PROPOSAL - SEE EMAIL)