General EEEMCal Meeting Summary 4/19/24

PARTICIPANTS: Artur, Renee, Philip, Carlos, Tanja, Hamlet, Richard, Douglas, Sasha, Joerg, Justin, Vardan, Dmitry, Julie, Patrick, Rosi, Hrachya

DESY BEAM TEST LOGISTICS

• Test beam slot request submitted on 4/12/24

• Expect decision in early May

• initial beam schedule selections/discussions usually end of April
• once schedule is made it has to be approved by the directorate before being made public

DESY BEAMTEST GOALS AND PREPARATIONS

• The main goals of a test at DESY would be investigations of stability, linearity, and power deposition for the two approaches (discrete and ASICS) and have the following specific goals:

1. test if ASIC gives comparable result with fADC
2. what is the minimum energy that can be detected with both sets of electronics
3. A third goal would be to test the impact of mechanical structure on the detector performance.

• We would assume that we use the 5x5 prototype from MIT and the 5x5 IJCLab-Orsay 5x5 prototype.

• the Orsay prototype includes the internal carbon structure that is planned for the EEEMCAL

• Either of these two prototypes could accommodate the discrete readout - the details how to achieve that have to be worked out

• Orsay prototype uses CAEN and Samtech connectors, similar to what was used for the NPS; also has 256 channels with fADC (could bring two modules)
• Action item: Justin organize a meeting with Fernando, Gerard, interested members from the EEEMCAL team; also consider inviting Marco Battaglieri and team (potential interest in SRO)

• Note that the lowest beam energy at DESY has been 500 MeV - to get lower need to discuss with the management

• Action item: check with DESY what is possible in principle at low end
• Also note that the AANL team is planning a test at 50-70 MeV - complementary to the DESY tests. How do the timelines compare?

• Action item: further develop the beam test preparations list (see initial slides)

• radiator testing and selection
• SiPM selection, procurement of SiPMs, as needed
• Complete PCB development
• Test PCB
• Material survey
• Simulations
• etc.

• Action item: develop a run plan

• Note that data taking at DESY would include an amplitude matching, e.g., center the beam on each of the crystals and match the gain/amplitude
• Items in the run plan should be ordered by priority

IRRADIATION SIPMs

• The test planned at the hadron facility with Giessen U. had to be postponed - there were problems with the accelerator that prevented the Giessen team to carry out the irradiation tests

• A test with UCR is currently planned for May 14-15

• Action item: send the SiPMs from Giessen U. to Miguel et al.

PROJECT UPDATES

• Anticipated dates for CD2 are fall 2025 with CD3 following the year after

GEOMETRY DATABASE UPDATES

• Received request to change beampipe "diameter"

• Comparing the present EEEMCAL design numbers to these request values - action: check for both, the regular and shifted geometries

NEXT MEETING: FRIDAY 3 MAY AT 8AM ET