General EEEMCal Meeting Summary 6/28/21

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PARTICIPANTS: Alexander Bazilevsky, Bruno Jolion, Carlos Munoz-Camacho, Cristiano Fanelli, Crytur-USA, Douglas Hasell, Hamlet Mkrtchyan, Hrachya Marukyan, Gabriel Niculescu, Julien Bettane, Lei Guo, Miroslav Finger, Nathaly Santiesteban, Petr Stepanov, Renee Fatemi, Richard Milner, Rosi Reed, Vardan Tadevosyan, Tanja Horn


  • Similar configuration in all detector proposals
  • differences in distribution of crystals (2 x 2 x 20 cm^3) vs. SciGlass (4 x 4 x 40 cm^3)
  • Differences in frame and support design depending if inside or outside DIRC
  • Universal ("DIRC") frame - current assumption for Athena and ECCE
  • Cantelevered from HCAL - CORE investigating this option


  • Presentations of an analysis for the following cases:
  • location: IP-6 (one EMCal) and IP-6+IP-8 (two EMCals)
  • configurations: 1.5T/ECCE, 2T/CORE, 3T/ATHENA
  • installation location: outside DIRC mounted to endcap HCAL, inside DIRC mounted on barrel HCAL and DIRC
  • Main points to pay attention to for the design:
  • Maintenance
  • Structure
  • Cooling
  • For maintenance space around the detector is important and also need for accessing the other detectors
  • IP-6 only or IP-6+IP-8: No negative effects for the mechanical design
  • 1.5T or 2T or 3T: increase the size of the mechanical structure and the cooling (depends on the DIRC configuration)
  • EMCAL Outside DIRC: Moving of the EMCAL for maintenance --> Probably 2 parts needed
  • For support structure need to consider the impact on the beam pipe - a mechanical structure is needed for the inner radius no matter if the EMCal comes in one or two parts
  • there are some advantages to having one part as then have the full circular structure to bear the load - having two parts increases the thickness of the structure needed
  • Another consideration: if taking out the detector along the beam pipe this would increase the diameter
  • overall, goal is to minimize the clearance between the mechanical structure and the beam pipe
  • Inner (between blocks) structure
  • Use of a mechanical structure like carbon fiber between blocks could make it easier to assemble the detector - possible to use 3x3 sub-sections (maybe more useful for a large detector, e.g., outside the DIRC)
  • Carbon plates can also help with positioning of blocks
  • Problem with two-part EMCal: need additional plate for alignment
  • Attachment/mounting
  • EMCal inside DIRC: mounted on universal frame (solution A)
  • alternatively attach to endcap HCAL (solution B), but questions about maintenance mode
  • Cooling - 3 possible options (nano-shell, SiPM onboard, traditional)
  • planning a prototype test with nano-shell material - heat conductivity 17 kW/m/K


  • SiPMs with 15um pitch have been purchased - expected to arrive end of July
  • Design work ongoing
  • Discussion about the requirements for temperature stabilization
  • should be stabilized across crystals
  • should be able to use back of detector for heat dissipation
  • Action item:
  • Estimation of power deposition
  • Needed information for installation:
  • Number of channels: 9x 50 V (1 signal per crystal)
  • Length of detector with crystals and photosensors