1. Comparison of cooling services at barrel end Description 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 length Total exhaust pipes off barrel end 22 88 Total input pipes off barrel end 44 88 Number of pipes on each stave/row 1 2 Staves/rows served by 1 exhaust pipe 4 1 Staves/rows served by 1 input pipe 2 1 Cooling ‘unit’ serves: alternate 4 rows integrated with stave Location of exhaust manifold inside barrel end no manifolding Number of pipes to manifold 2 pipes go to 1 “ Length of manifold approx. 60mm “ Material exhaust spiders Cu ss Material input capillary CuNi ss Number exhaust connectors 22 88 Number input connectors 44 88 Extra pipe on stave/row > SCT x 2 Extra exhaust pipe on barrel end > SCT x 4 Extra pipe outside barrel end > SCT x 3

2. 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/connectors on 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 flange cooling direction

3. SCT BARREL END…..22 Cu cooling pipe spiders Wait and see……if this scenario leads to a 10% loss in the EC then Upgrade will probably lose 40% in the EC even without cooling connectors.