Summary EEEMCAL Design/Engineering 6/2/2023

PARTICIPANTS: Josh, Richard, Tanja, Carlos, Jim, Julien

REVIEW EPIC ENGINEERING WORKSHOP

• General overview of the workshop: main theme was the installation of the detectors

• how detectors are currently installed and how the EIC detector may be installed
• specific detector discussions (tracker, RICH, DIRC frame, imaging barrel ECAL)
• discussions of all subsystems and installation

• DIRC FRAME INTERFACE with EEEMCAL: Avishay Mizra currently working on new/updated design

• EEEMCAL weight given is ~3 tons + safety factor of about factor of two
• attachment points for EEEMCAL will be defined by the updated DIRC frame

• the rails are a new feature on the DIRC frame - this because the pfRICH has to be sliding in with rails in front of and before the EEEMCAL is installed; there cannot be any protrusions into the DIRC frame - cannot use periferal mountings --> limits hardware that can be used for EEEMCAL
• assumed to be done with Thomson rails at 12, 6, 4, and 8 o'clock positions

• with four rails overconstrained; holding tolerances for linear rails is basically impossible --> with what precision should the detector have to be aligned (do we need to align or just need to know where it is when it is in place)
• pre-estimate load/stress deformation of the DIRC frame
• structure is assumed to be stainless, welding - magnetic -- alternative: use bolting
• Important for moving forward with the EEEMCAL design (Julien) ==> need to know design of DIRC and clearance between DIRC and EEEMCAL

• BEAMLINE will be in place

• is there a need to split open the EEEMCAL - clam-shell design?
• from physics point of view would likely lose some acceptance so not desirable - and in principle have enough longitudinal space in the assembly hall
• usually beamline not supported inside the detector
• beampipe bakeout, alignment

• SERVICES - COOLING

• cooling requirements: what is needed, size of cooling feeds
• how much cooling is needed? - currently tests are being performed at IJCLab-Orsay
• main idea is to have insulation and active cooling
• four lines: two internal, two external, but it may be necessary to have cooling on each board (additional manifolds)
• cooling: primary water feed, if need cooler then need to add another mechanism like a chiller
• mechanically possible to place cooling in the plates - at the moment the design does not include that
• diameter of cooling feeds: numbers from spreadsheet are still the estimate
• expect results on cooling at the end of the year
• Dry nitrogen available from backend at EEEMCAL

• Action item: Josh send zoom link to Jim and Julien for Monday meetings

• Mechanism for interaction with BNL engineers for EEEMCAL: Josh/Jim/Julien

NEXT MEETING: 16 JUNE AT 8:00AM ET (ENGINEERING)