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 pipesOld SCT cooling exhaust channels used for samepurpose 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 beno space in the existing cooling exhaust channels, so newchannels eg one per quadrant would have to be created inorder to keep each set together for maximum cooling efficiency. Design of layout on the cryostat is crucial to thedesign of the layout on the barrel ends!

Evap.cooling routing offbarrel end.

inputexhaustexhaustmanifold

3

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45.0

rows perQuadrant:

11

9

7

45

3

4

5

6

6

7

6 exhaustpipes to‘old’ coolingchannel incryostat

7 7

input pipesin ‘TRT’channels(need manifolds)

exhaustmanifold

TJF 28/06/07half length cooling loops

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rows perQuadrant:

11

9

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TJF 28/06/07

exhaustcoolingonly

power andsensor cablesgo in old TRTchannels

power andsensorcables in 4dedicatedchannels perquadrantshown as one‘bunch’ persupermodule

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rows perQuadrant:

11

9

7

TJF 18/07/07

exhaustcoolingonly

power, sensor cables,fibres and input pipesgo in old TRT channels

optofibrerouting:one fibre fromeach PCB joinsone 12 wayribbon:9 ribbons perquadrant

single fibresribbon

four PCBs per supermodule