1. Cooling loops for prototype staves Update on cooling pipes progress Confirmation of design of loop Discussion on design developments of loops for future staves Richard French – Sheffield Ian Mercer – Lancaster Martin Gibson – RAL John Matheson – RAL John Noviss – RAL Ian Wilmut – RAL Georg Viehhauser - Oxford

2. Cooling pipe manufacture progress Ian Mercer has made every single permutation of cooling pipe both Stave & Stavelet plus test pieces needed for the final phase of the project. Hold up is now the welding and fittings = me, SSC & industry. We are running out of the 2.275mm Ti tube as this was a “trial” tube only. Working with DESY to get a second “joint” tube order underway with the EC community. – Early days so no promises, this is our ideal not necessarily theirs so monitor developments. Welding on 1/8” CP2 Ti now ready for full metallurgical testing – oxide battle now won with improved gas purity. Welding on 2.275mm CP2 Ti looks promising, still waiting for tooling from Sheffield workshop – currently overloaded (backlog from Irrad work) so could move elsewhere. UKtubeStock.xls: UK cooling tube stock list is on the TWIKI and is updated as we use by RF, MG, IM UKtubeStock.xls Temporary test fittings for Ti: Proving troublesome as looked at Vac brazing – low cost, a fast universally understood and well documented option. Using Ni plating of the Ti – the plating then acts as a braze (joint only as good as plating) Downside is annealing effect on Ti – decided this shouldn’t matter for test circuits or simple weld on stalks. Company (Aerobraze/Wall Colmonoy) and SSC excel sheet bank details – massive screw up. Never worked from the start, company redundancies mean new contact. Still on for 2011 delivery. Can move to Bodycote but double cost as brazing not in-house.

3. Confirmation of design of loop Drawings from Peter Sutcliffe are what we have been working from: Stave 09 cooling tube NP‐49‐01‐05 issue B. (pic) All cooling circuit & assembly drawings were on the TWIKI link - https://twiki.cern.ch/twiki/bin/view/S andbox/TrackerExchange#5_7_Drawin gs_Stave_Stavelet_Test https://twiki.cern.ch/twiki/bin/view/S andbox/TrackerExchange#5_7_Drawin gs_Stave_Stavelet_Test Looks like this needs tidying up as all the original 1.2m long drawings have vanished from site We have other options in – 2.275mm OD x 0.130mm wall CP2 Ti – 3.175mm OD x 0.20mm wall CP2 Ti – 2.0mm OD x 0.20mm wall 316L stainless – At what point does the baseline shift ? We are still working with the following baseline: – 1.2m Stave structure using a 316L Stainless Steel cooling pipe with a OD of 3.175mm and a wall of 0.22mm. – This includes the SMC at the side of the stave

4. Discussion on design developments of loops for future staves Material in Stave core – CP2 Ti looks good. Diameters – Match pressure spec from plant - ROUGH GUIDE 1) Size:2.00mm OD x 0.10mm Wall x 3 Metre+/-10mm Cut Lengths. Qty/Price:150 Metres @ £ 41.75 per Metre. 2) Size:2.50mm OD x 0.12mm Wall x 3 Metre+/-10mm Cut Lengths. Qty/Price: 150 Metres @£ 38.25 per Metre. 3) Size:2.275mm OD x 0.125mm Wall x 3 Metre+/-10mm Cut Lengths. Qty/Price: 150 Metres @£ 44.50 per Metre. 4) Size:2.275mm OD x 0.10mm Wall x 3 Metre+/-10mm Cut Lengths. Qty/Price:150 Metres @£ 46.75 per Metre. – Length of tube that can now be manufactured is a problem under new EU REACH regulations. Need to demonstrate that a circuit can be made using only 3m not 3.2m as we are used to handling. Other considerations: Material from z=1.2m – Thicker walled tube looks to be more suitable – define minimum. – Electrical break not defined Diameters – Starting to shape up from SoI with input from George – NOT by any means final choice as there are still some crazy people digging up the old presentations. Joining method – Orbital welding still favourite. – Need to prove: Electronics damage Repeatability