General EEEMCal Meeting Summary 7/7/23

PARTICPANTS: Ioana, Jim, Richard, Rosi, Tanja, Carlos, Joerg, Julien, Justin, Sasha, Carlos Y., Artur Hoghmrtsyan, Hamlet, Hrachya Marukyan, Julue, Irina, Vardan

UPDATE ON NSF MSRI

• Received no notification about Reverse Site Visit - assume it is not required

ENGINEERING/DESIGN

• Clearances: beampipe 5mm, DIRC 4mm

• Specifications:

• PWO: 8.28 g/cm3
• Dimensions: 20x20x200 mm
• Mass: 0.662 kg
• Nb: 2850 crystals (with latest design of beam pipe and DIRC frame had to remove some crystals - still changing, so cannot finalize the crystal number until these mechanical design numbers are fixed)
• Total mass: 1900 kg
• external size: 123 cm
• Space max: 0.5mm (carbon plate)

• Design of DIRC and beampipe about integration (Rails)

• use boxes for main PCBs (for better cooling) - need to do a thermal study

• beampipe design: have 11.7mm vertical and 11mm horizontal negative clearance (less space for eeemcal)- placement of holes required increase in size of beampipe

• Options for rails

• Fixed rails fastened into DIRC plus two removable rails - mechanical calculations needed, in particular for DIRC

• Number of sectors of EEEMCAL: 4, 6, 8, 12

• Optimize number of cables: 1 PCB adapter for cluster of 16 crystals or 1 for 4 crystals

• N(electronic boxes) = f(nb sectors)

• Number of cables changes dramatically depending on sectors and cable cluster layout (not same mechanical, cooling, and cables)

• Thermal study

• room ambient temperature: what is it? - important for sizing of cooling
• pfRICH: power dissipation, temperature stability, temperature in clearance area, and similar for DIRC
• EEEMCAL: stability required for the crystals +-0.1 degC, heat must be evacuated with cooling, water cooling plate in front of detector (copper, thickness to optimize < 15mm, material: copper, aluminum?), water cooling plate + air for the electronic boxes,
• discussion with vendor about small heat exchanger that could supply one box
• started with mechanical prototype thermal tests (11 temperature sensors: 6 on crystals, 3 in box, 2 outside box)

SIPM Specifications

• Original table from Oleg - fill in web form

• Updated table from Calo WG (Norbert)

• Dedicated TIC meetings dedicated to ASICS for calorimetry

• 7/10: discussion of ASIC for calorimeters

EEEMCAL reviews

• Plan final design review for crystals: week of July 17-21 - possibly Friday July 21 at 8AM

• see email for charge and preparations

• August 8: clarification of particular questions for calorimeter

• see email from July 3rd for requirements and preparations - copied below for reference

Dear All,

we (== project) will set up in July meetings with the subsystems to address the questions below, because we need to make progress towards them to pass the technical design review. The meetings will be structured that we combine different subsystems, so ECals, HCals, tracking, PID, …. The topics to be discussed will be

• Requirements, please familiarize yourself with the current requirements, see requirements and attached file, so you can let us know at the meeting what is missing.
• The needs for Services

• this includes HV, LV and signal cables as well as the need for cooling, please see next items for details
• for this we absolutely need the excel sheets posted here link filled, we will help in the meeting if there are problems to do so

• we need to get the readout chain defined (see the same excel sheets as for the services, just different tabs) this means we need to know the size of the planned RDOs and how far you can drive your signals, so we can find a place for the RDO in the detector volume. but we also need information on the FEBs and the sensors.
• in addition to this we need to define the cooling needs for the different sub-detectors so please think about your electronics power consumption.
• and last but not least the test beam needs, thanks all who filled the excel-sheet already [TestBeamNeeds.xlsx link]

So expect sone some email with an invite to a meeting, please try to be flexible and feel free to invite other experts to the meeting if needed, but please keep in mind we want to hold the attendance of these meetings on the low side to make progress and come to some decisions.

Best Elke and Rolf