ATLAS Tracker Upgrade - Services at Barrel Ends: Scenario where services are routed through existing services channels on cryostat shown on the next 3 slides ie: Old TRT channels used for fibres, power and sensor cables and input cooling pipes Old SCT cooling exhaust channels used for same purpose in the Upgrade Could possibly work for 108 supermodules (with lots of manifolding for cooling pipes) Wouldn’t work if outer barrels were included – these would need to use existing power cable channels but there would be no space in the existing cooling exhaust channels, so new channels eg one per quadrant would have to be created in order to keep each set together for maximum cooling efficiency. Design of layout on the cryostat is crucial to the design of the layout on the barrel ends!

Evap. cooling routing off barrel end. input exhaust manifold rows per Quadrant: exhaust pipes to ‘old’ cooling channel in cryostat 7 7 input pipes in ‘TRT’ channels (need manifolds) exhaust manifold TJF 28/06/07 half length cooling loops

rows per Quadrant: TJF 28/06/07 exhaust cooling only power and sensor cables go in old TRT channels power and sensor cables in 4 dedicated channels per quadrant shown as one ‘bunch’ per supermodule

rows per Quadrant: TJF 18/07/07 exhaust cooling only power, sensor cables, fibres and input pipes go in old TRT channels optofibre routing: one fibre from each PCB joins one 12 way ribbon: 9 ribbons per quadrant single fibres ribbon four PCBs per supermodule