R.Becker (MIT) 15/10/02 UGBS Main Plate Patrick Schmid (left) of ETHZ did the CNC machining of the plate. Urs Horisberger (ETHZ) Completed follow up machining

R.Becker (MIT) 15/10/02 UGBS Plate Machining Back (top) & Front (right) sides of plate

R.Becker (MIT) 15/10/02 UGBS Subassemblies

R.Becker (MIT) 15/10/02 UGBS Plumbing Model Model was made to: perform a Fit check of the subassemblies Weld the whole system Test the valves & system

R.Becker (MIT) 15/10/02 MV197 Bracket

R.Becker (MIT) 15/10/02 MV197 Bracket Tube welding The full assembly looks like thisEasier to look at half! The welding procedure will look at only half since the other side is mirror symmetrical

R.Becker (MIT) 15/10/02 2 Step Construction First the “U” (welding steps 1,2,3) are welded not mounted in the bracket. Then the xv254 and the filter are mounted and welded (steps 4-6) The GP50 is installed and all remaining welds performed. The welded components are now removed to allow for the welding of the MV197 valves The MV197’s are installed and secured as shown The “U” (steps 1,2) is pre-welded and then welded to the valves (steps 3,4) the 1/4”-1/8” reducers are pre-welded to the T-junctions and then welded to the valves (steps 7,8) The “U’ is then welded (steps 9,10) The “U” to the xv234is then welded per step 11. Step 1 Step 2

R.Becker (MIT) 15/10/02 Step 3 The Step 1 components are then mounted and welded (It may be more practical that all 4 mv197 are mounted before installing the pre- welded pressure and filter units) Perform same steps for mirror side Note also, all 1/8” tubes going to the buffer volumes or otherwise (NOT SHOWN -but at the ends of all 1/4-18” reduction pieces) need to be pre-welded -the welding head will not fit later.

R.Becker (MIT) 15/10/02 4 Valve Bracket Welding Sequence Follow sequence as shown Welds 1 & 5 need attention since they may need to be done first

R.Becker (MIT) 15/10/02 4 Valve Bracket

R.Becker (MIT) 15/10/02 2 Valve Bracket

R.Becker (MIT) 15/10/02 2Valve Bracket Welding Sequence Welding follows the sequence above. Step (12)* is welded after inserting the filter into the bracket. Weld 4 in the 2nd step should be performed after the oriface/filter unit is loosely fitted into the bracket After welding is copleted RTV is injected in the Filter cavity Step 1 (Oriface/Filter Unit) Step 2 (valves) 2 valve bracket Completed

R.Becker (MIT) 15/10/02 Venting Valve Bracket

R.Becker (MIT) 15/10/02 TRD Gas System Mechanics Status R.Becker (MIT) October 30, 2002 Radiator not shown UGBS design done, commercial version being assembled Flight main plate ordered, & most flight brackets manufactured UGBS kit including welding procedures being prepared for ARDE UGBC design needs to be finalized UGBC to TRD manifold plumbing & bracketry designs needed

R.Becker (MIT) 15/10/02 UGBC (Circulation System) Status: Sealed cylindrical container design feasible –CERN welding experts state that such a cylinder can be welded cleanly. Rough mechanical design done (Right) –components arranged within boundaries (wasn’t easy) –4-valve bracket adapted from UGBS Detailed design foreseen by early December