1. Stave Core QC Peter Sutcliffe RAL 24 th Sept 2014

2. R-Phi Bus tape Co-cured to Carbon Skin EOS Closeout Cooling Tube Assy Stereo Bus tape Co-cured to Carbon Skin Allcomp foam Cooling strips Honeycomb core Carbon C Channels Allcomp foam End cooling Z=0 Closeout Outline and Stave Detail 25/09/14QA RAL2 2 Very few changes since Freiburg, mainly in the SMC cooling block area Drawings are available here https://twiki.cern.ch/twiki/bin/view/Atlas/UKThermoMECHDocs currently being used for the stave toolinghttps://twiki.cern.ch/twiki/bin/view/Atlas/UKThermoMECHDocs o Looking to upload to EDMS Areas that need to be looked at are the tolerances eg flatness of the stave, twist in the ‘C’ channels

3. Stave Construction and Materials 25/09/14QA RAL 3 Stave is manufactured from 2 UD Carbon and kapton face sheets with a core manufactured from Ultracor Honeycomb and Allcomp Foam ComponentMaterialRemarks Carbon Face sheet Tencate K13C2U 45g/m 2 EX1515 Resin 3 layers 90/0/90 total thickness 0.15mm Co-cured onto a kapton bus, thickness 0.2mm Honeycomb Core Ultracor Carbon Honeycomb UCF-126-3/8-2.0 Final thickness 5.2mm Carbon Foam Core Allcomp K9Final thickness 5.2mm Cooling tubeTitanium CP32.275 x 0.125 wall End CloseoutsPEEK CF30 C ChannelsCarbon Fibre Honeycomb core Carbon foam C Channel Face sheet Bus tape

4. Quality Assurance- Quality Control Quality Assurance Proactive R and D to determine: – Tooling design – Gluing techniques – Good manufacturing practice – Written procedures, consistency with manufacture – Cleanliness – Tolerance selection – …. Quality Control Reactive – Inspection techniques – Inspection procedure. When to physically inspect eg after each operation Inspection ‘stamp’ after each operation – more likely a database. – CMM, non contact, ESPI Checking tolerances-flatness, parallelism – Visual inspection – Identifying defects and assessing concessions – Repair procedure 25/09/14QA RAL4

5. Plank #9 flatness and stiffness 01/07/14 Forum on Tracker Detector Mechanics - Hamburg, 2014 5 Flatness is around 0.20 and a twist has been shown. Not as good as we would like although the overall thickness is very uniform, proving the CNC machining of the core works. Bending stiffness of the planks made so far.

6. How flat can we make the stave? What tolerance to have? 25/09/14QA RAL6

7. Locking points 25/09/14QA RAL7 Need to specify ‘twist’ in the locking points

8. Stave Geometry Critical Dimensions: Overall Length 1277 Width 115 EOS at Z=0 to Silicon Edge 0.1mm Module to Module Gap 0.46mm Pitch of Modules 98mm 25/09/14QA RAL8 R Phi Side Stereo Side XY dimensions of Fiducials needs defining