General EEEMCal Meeting Summary 11/19/21

PARTICIPANTS: A. Bazilevsky, C. Munoz-Camacho, Crytur-USA, D. Hasell, H. Mkrtchyan, H. Marukyan, M. Finger, R. Reed, V. Berdnikov, T. Horn, R. Fatemi

EEEMCAL IN DETECTOR PROPOSALS

• Draft text from ATHENA and ECCE proposals posted - CORE expected to come soon

• Comment on Fig. pion rejection in ECCE proposal - expect PWO and SciGlass performance to be similar, at first glance this fact not clear since there is a lot of information presented in the figure, is there a way to simplify?

• Authorship:

• done by institution
• many EEEMCAL institutions will be listed on all proposals - IB representative from each institution has to communicate the desired authors to the proto-collaborations (ATHENA: email to Ernst, ECCE: update GoogleSheet, CORE: email Charles/Pawel)

SIMULATIONS

• ECCE: Orsay team produced performance plots
• ATHENA: AANL team working on performance plots

• Note that for the performance plots for the YR an ideal case was assumed

• no materials
• no gaps
• Gaussian distributions

DESIGN

• Design technical note posted and circulated to all proto-collaborations

• Reference for the EEEMCAL design note: EEEMCAL Mechanical Design and Integration, J. Bettane, C. Munoz-Camacho, V1.2 (Nov 2021)

PROTOTYPE BEAM TESTS

JLAB

• Completed beam tests with PWO and SciGlass (2cm x 2cm x 20cm) and different readout schemes (PMT, SiPM)

• Array: 3x3
• SiPM configurations: 4 SiPM/crystal and 16 SiPM/crystal (Crytur-USA prototype)

• Initial results shown for PWO and SciGlass

• Note: the 3x3 calorimeter was not calibrated due to time constraints - would really need to calibrate channel-by-channel
• Action: visualization of the tails - note that the current fit is central core - will be improved in more detailed analysis using crystal ball function (Link); note: in general as long as fits to data and simulation are performed in the same way should be ok to compare the results

• Crytur-USA prototype

• 3x3 array featuring 16SiPMs per crystal - combined readout, no noise observed in the lab

• issues with temperature rising in the detector box

• initially observed during cosmic tests via missing signals - but at that time unclear if missing signals were due to trigger, temperature, etc.
• after beam tests temperature was measured with an external probe to be 100F near the sensors (and probably even higher inside the box); no signals were observed from beam test
• possible reason for increased temperature: box was made light tight by closing it with a cover that may have restricted air flow

• some data are available for analysis from cosmics test

• additional optimizations planned: adjustable gain

DESY

• Successfully set up 5x5 PWO+PMT and began debugging/gain matching etc.
• Planning 3 different readout configurations (QCD, CAEN digitizer, JLab fADC250, SRO)
• Plan to start taking data this weekend
• Another period of data taking is planned for spring 2022

• opportunity to test SciGlass in 5x5 setup then
• Note: currently use 21mm wrapping in x and y

EEEMCAL IN EIC PROJECT - DISCUSSION OF LONG-LEAD PROCUREMENTS (Sasha)

• Currently have PWO crystal configurations:

• ATHENA: ~2000 blocks
• ECCE: ~3000 blocks

• Production capacity CRYTUR:

• ~500 blocks/year assuming concurrent projects other than EIC
• Maximum capacity is 720 blocks/year (60 crystals/month)

• Normal procurement starts after CD3 approval and must be at most 3 years from contract award to when blocks are delivered. At 500/year it would require more than 3 year --> long-lead procurement

• Long-lead procurement starts when CD2/CD3A is approved - planned for Spring 2023

• procurement would then start in ~Sept 2023 and all blocks must be delivered within at most 4 years

• Actions for start of long-lead procurement

• Crystal: need module design 90% complete by Spring 2023

• Need specifications: dimensions, optical characteristics (light yield, transmission, ...), radiation hardness

• SiPMs: need configuration and specs design complete by Spring 2023 - note: SiPMs included in Long-Lead Procurement since whole detector needs on order 1 million and vendor would need more than 4 years to produce them

• Need specifications: pixel size, how many per crystal, etc.

• Note on Lead Glass

• About 9000 blocks available from Phenix - would need readout, some refurbishment etc.

• Note on SciGlass

• for readout of large cross section 4x4 need some more detail on how it is envisioned, e.g., using light guides or more SiPMs per block

BRIEF REMINDER ABOUT FUNDING PATH

• Have an R&D plan posted on the Wiki (Link) with distribution of tasks globally

• Expect NSF MSRI funding proposal submissions in January 2023 - by that time refine the tasks and which group(s) take on which components for asking for funding, also including international agencies (Armenia, Czech Republic, France)

NEXT MEETING: 10 DECEMBER AT 8:30AM ET