SLHC - WP7 Barrel UPDATE on LAYOUT OF SERVICES AT THE BARREL ENDS OPTO PCBS: Sketches describe options after discussion with Tony Weidberg ( ) Preference for OPTO PCBs to be outside barrel confines for reasons of accessibility – easier to change and modify boards during testing and easier to cool locally, possibly making use of ‘fins’. There may have to be four boards per module row – easier to fit these in outside. Each PCB will have one jacketed fibre connecting to it. This will mean 12-way ribbons are split with each fibre having a measured length to reach the module row (can be from different ‘barrels’) TJF 22/06/07

cooling input exhaust connector cable flat cable module rail guides integral with cylinder SECTION through ‘stave’ suggestion only – not baseline flat bus cable housing & LOCAL support barrel flange region exhaust input Opto PCBs supported on structural ‘end plate’ Bus housed in local support with strip links to connectors on hybrid 4 readout PCBs connections cool input connector cooling capillary power and sensor cable connectors BARREL END view from outside end exhaust cooling pipe TJF 22/05/07 exhaust connector 1 readout/ttc optofibre connected to top of each Opto PCB cooling fins 4 Opto PCB layout option

cool input Z=1000 Z=1050 R 380 R mm OPTO PCB MODULE cooling input power electrical data/ttc barrel flange barrel flange single sleeved optofibre connects to top of PCB sensor and power cables or cable-tapes module connector BUS TJF 22/05/07 Z=1100 sensor cool out barrel end structure seal module row end plate with feedthroughs BARREL END side view 4 Opto PCB layout option nb Z ENVELOPE UNDER DISCUSSION ! clip

) Evap. cooling routing off barrel end. = input = exhaust will need Pressure Relief Valves n input pipes go to each cooling channel on cryostat will need to have manifolds TJF 31/05/ exhaust pipes go to each ‘old’ cooling channel exhaust manifold

2) Power cable routing: distribution in PHI depends on space available in cryostat TJF 22/06/07 cooling input connector power cable x2 ie 54 p Quad these belong to same quadrant

3) Optofibre routing: one fibre from each PCB joins one 12 way ribbon: 9 ribbons per quadrant TJF 22/06/07 each single fibre connects onto a PCB (no splice) = FOUR adjacent Opto PCBs 7 rows 9 rows 11 rows fibres could be routed in channels ribbon channels

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

rows per Quadrant: TJF 28/06/07 exhaust cooling only power and sensor cables go in old TRT channels power and sensor cables in dedicated channels