General EEEMCal Meeting Summary 10/8/21

PARTICIPANTS: A. Bazilevsky, C. Munoz, H. Mkrtchyan, H. Marukyan, N. Santiesteban, R. Fatemi, T. Horn, L. Guo, V. Tadevosyan, D. Hasell, V. Berdnikov, Crytur-USA, Crytur-CZ

PROPOSALS

• Document writing ongoing for all proto-collaborations

• ATHENA - main contact: Vladimir
• CORE - main contact: Carlos
• ECCE - main contact: Tanja

• Action: circulate any drafts as they are and/or post on Wiki for EEEMCAl team to review and comment

SIMULATIONS

ECCE (Nathaly)

• Discussion of EEEMCAL and barrel calorimeter neutral pion mass resolutions

• Approach: look at reconstructed pion mass for calorimeter and examine resolution of mass with changing energy

• observe that width of mass decreases with increasing energy - makes sense as one gets a mesh or merged events (cannot distinguish photons anymore)

• Probability of meshing in barrel near 100% at and above 10 GeV - so cannot distinguish two photons with this setup

• note that calorimeter location has an inner radius of ~80cm - too close for present 4cmx4cm granularity
• solution: use finer granularity, e.g., 3cm x 3cm
• question: why does the probability for merging not go to zero? - possible explanation is that an energy cut is implemented, e.g., events where second photon at very low energy would not be included

ATHENA (AANL team)

• working on extracting EEEMCAL information from the simulation

EEEMCAL DESIGN

• Work ongoing on additional support for SciGlass since blocks are longer than crystals

• use internal ring to provide additional support for glass

• Inner ring - stainless steel - working on implementing cooling from inside taking into account all space constraints

• Also working on implementation of readout - 16 SiPM on each module

• Major next steps awaiting decision on detector

• Action: think in which places to publish the design information

• EEEMCAL internal - for sure
• E&D EIC Project - is there a specific place for that?
• Other

PROTOTYPES

JLAB SCIGLASS AND SiPM 25um READOUT/SRO TESTS

• Readout and SRO detector prototypes installed in Hall D this week

• Many SciGlass blocks were received damaged and awaiting replacement for 3x3 test - currently have 3 blocks installed in a beam test bench setup

• Plan for prototypes and SciGlass

• start taking data with PWO SiPM readout and SRO test
• take data on SciGlass individual blocks in test bench
• next: once replacements arrive install 3x3 SciGlass prototype and take data

• Change in prototype beam time schedule

• December beam time originally planned for tests of 40cm SciGlass was cancelled --> test of 3x3 prototype with long modules will be in 2022 earliest

• Energy range of prototype beam tests - energy resolution provided by pair spectrometer and is on level of 0.6%

• 3x3 prototypes have one energy only (~5 GeV) at this time. In future hope to install instrumentation that allows for remotely accessing a range between 2.5 - 6 GeV
• 12x1 test bench can access a range

• Plan for Testing SciGlass

• take data with prototype - modules are 20cm long, so leakage is expected
• compare to simulation

JLAB CRYTUR PROTOTYPE

• Assembly and testing is ongoing at Crytur/CZ

• For pretest at JLab before beam:

• plan to take data with cosmic muons (1Hz) and/or sources to test channels

• Action: send list of items that are needed for pretest and any additional material needed for beam test

DESY

• Preparations ongoing - instrumentation has been shipped to DESY

NEXT MEETING: 29 OCTOBER AT 8:30AM ET