Comparison of cooling services at barrel endDescription SCT Barrel Upgrade ID barrel one end one end

Total number of staves/rows 176 Staves/rows serviced off one end 88 use sample of 88 Length of stave/row wrt barrel length full length half lengthTotal exhaust pipes off barrel end 22 88Total input pipes off barrel end 44 88Number of pipes on each stave/row 1 2Staves/rows served by 1 exhaust pipe 4 1Staves/rows served by 1 input pipe 2 1Cooling ‘unit’ serves: alternate 4 rows integrated with staveLocation of exhaust manifold inside barrel end no manifoldingNumber of pipes to manifold 2 pipes go to 1 “Length of manifold approx. 60mm “Material exhaust spiders Cu ssMaterial input capillary CuNi ssNumber exhaust connectors 22 88Number input connectors 44 88Extra pipe on stave/row > SCT x 2Extra exhaust pipe on barrel end > SCT x 4Extra pipe outside barrel end > SCT x 3

modules

staves

Current SCT Barrel cooling layout for 4 rows – 1 manifold.

Upgrade SCT Barrel cooling layout for 4 rows – no manifolds

Schematic illustrating comparative occupation of cooling pipes/manifolds/connectorson one barrel end flange – overlap of modules not shown, equivalent active area – 4 full length rows on ‘old’ compared with half-length ‘new’ (very approx.) Not to scale.

end

flang

e

cooling direction

SCT BARREL END…..22 Cu cooling pipe spiders

Wait and see……if this scenario leads to a 10% loss in the EC thenUpgrade will probably lose 40% in the EC even without cooling connectors.