Concern over impact of over ambitious access scenarios on design compromises

1. To note for actions from Wednesday • Concern over impact of over ambitious access scenarios on design compromises • Feasibility of remote pixel installation needs to be proven at a very early stage. • Take concern to ITK – formulate – homework - friday • Location of opto-electrical conversion for strip detector. Path to decision – Friday • Side mounted Eos for barrel strip – now baseline • future full length prototypes built this way • 2e mounting scheme to adapt - ? • Path to EoS cooling pipe layout decision – Friday • Discrete vs continuous interconnects – path to decision – Friday • Grounding - Isolation immediately at end of local support – baseline • Path to confirmation of baseline – Friday • Pipes/core to be connected to power cable shield • Cooling pipe loop shape/location • Sharp bend, 8mm, pushed to z=0 end – baseline • Allowing for radiation profile = headroom along stave • To foam or not to foam that is the bend question – path to decision Friday • Path to confirmation of baseline, including z=120 simulation – Friday • Co-cured pipe to foam for strips – relevant to strips? Friday Friday afternoon is a ‘planning’ session. Proposal was to compile list of items to discuss/ plan way forward

2. Thermal headroom utilisation in barrel stave • Module gluing simplification, • skin thinning, … path to choice to be defined – Friday • Barrel stave contraction – fixation z=0 or z=1.2 – path Friday • End of stave fixing arrangement design needed • path to definition/design – Friday • Define stave to macro-structure stability requirements – path Friday • Defer to after further talks • SE445 vs IRS2125 • Attaching pipes to foam in strip detector (co-cure?) • Use of IR, vibration, 4point bend in QA • Also for note • In mechanical FEA, joints/fixation need extreme attention to properly simulate – use large safety factor for joints X10 rather than simulate • Concepts exist for macro supports – insufficient effort to take forward • Lower density thermal foams are under development - ~18 months to availability • Cooling pipes successfully co-cured in pixel stave, wrapped and unwrapped