1. Barrel services minimum space allocation in Z ‘Strawman’ layout and Spider… layout WARM and COLD GAP versions Services envelope in Z: In order to reserve space allocation - need to use places in the layout where the maximum accumulation of services in Z occur – cannot use an average as it will not be possible to squash services into gaps to equalise the occupation. Need to know which existing services are to be kept and if the existing channels/ducts have to be re-used - before making useful layout in R/PHI for barrel ends. example: x-section in Z for services accumulation, barrels 1, 2 and 3: 29mm10 24 21 thermal barrier & feedthroughs uninsulated cooling pipes & manifolds cooling connectors bus tapes/cables with ‘twist’ factor 84mm TJF

2. 84mm in Z >150mm in R (insufficient clearance) >160mm in Z Barrel services minimum space allocation in Z (‘Strawman’ layout) Z=0 0 B1 B2 B3 B4 B5 How will services from Bs 1,2 and 3 be supported on the inside of B4? Will need separate support cylinder or rings for this, adding to space occupancy and material. Services at barrel ENDS also need supports for connectors/strain relief. COLD GAP version services in Z: bus tapes, connectors, cooling pipes, connectors and manifolds TJF

3. 96mm in Z >162mm in R (insufficient clearance) >172mm in Z Barrel services minimum space allocation in Z (‘Strawman’ layout) Z=0 0 B1 B2 B3 B4 B5 Thermal barrier will need to serve as services support as well – if not, then add this to thickness. Cooling exhaust pipes will need insulation – 6mm thick ie 12mm added here. WARM GAP version services in Z: bus tapes, connectors, insulated cooling pipes, connectors and manifolds TJF

4. 84mm in Z Barrel services minimum space allocation in Z (‘Spider…’ layout) Z=0 0 B1 B2 B3 B4 B5 COLD GAP version 130mm in Z Advantages of simplified barrel layout: avoids two 90 bends in services route just one large services ‘spider’ so can organise services into channels only one type of support needed for connectors/strain relief at barrel ends 0 services in Z: bus tapes, connectors, cooling pipes, connectors and manifolds TJF

5. 96mm in Z Barrel services minimum space allocation in Z (‘Spider…’ layout) Z=0 0 B1 B2 B3 B4 B5 Thermal barrier will need to serve as services support as well – if not, then add this to thickness. Cooling exhaust pipes will need insulation – 6mm thick ie 12mm added here. Not as good as the Cold gap version but better than both Strawman layouts WARM GAP version 142mm in Z services in Z: bus tapes, connectors, insulated cooling pipes, connectors and manifolds TJF