LARP Phase II Secondary Collimator RC1 Collimator Development and Test Program Status Revised 3/07/07 LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 1 /15

Winding and Misc. Tests update Braze Test plan forward Outline Winding and Misc. Tests update Braze Test plan forward Thermal Test (Prototype Hardware) and Test Lab update RC1 progress and near term plans LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 2 /15

Winding and Misc Tests update In progress now (second 200mm lg Winding Test Mandrel) : Slight modification to drive cog is required due to machining error at Mandrel upstream end. Winding of cooling lines onto Mandrel will then proceed. Up Next: Brazing of the above completed assy. Lower priority, but still on the list: Twist a length of actual cross-section to failure for a measure of the margin of safety and maximum torque requirements. Bend samples of actual cross-section into required configurations. Section samples to inspect for internal distortion shapes and smoothness of transitions. LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 3 /15

New 200mm long Mandrel (upstream end) LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 4 /15

New 200mm long Mandrel (down stream end) LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 5 /15

New 200mm long Mandrel (up stream end) Larger opening here prevented drive pins from engaging in slots LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 6 /15

Braze Test update and plan forward In the Queue at the Braze Shop: Cu-Mo Hub-Shaft Brazing is next up for the braze shop (minor modifications are anticipated for proper braze clearances). Should have brazing completed by next week. Assy. will be sectioned for microscopic inspection of the copper grain boundaries at joint. Still waiting: 1st Braze Test Assembly has been re-scheduled to late March for the vacuum bake and pump down testing. Will section the Assy. and inspect braze joint voids after above test is complete. LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 7 /15

Cut-away of Cu-Mo Hub CAD Model #1 #2 #3 #4 #1 - Mandrel Dummy #2 - Mo Shaft Dummy #3 - Mo Backing Ring #4 - Cu Hub with braze wire grooves LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 8 /15

Cu-Mo Hub Braze Test parts #2 #1 - Mandrel Dummy (not shown) #2 - Mo Shaft Dummy #3 - Mo Backing Ring #4 - Cu Hub with braze wire grooves #3 #4 LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 9 /15

Full Size Single Jaw Thermal Test Hardware Progress Jaw 1/4 sections (qty 24) now at SLAC require slight modifications for braze gap requirements. Full length Mandrel in fabrication at local vendor. Due 07 March 07. Central bore machining of Mandrel on hold pending Mo-Cu Hub braze test results. Power Supplies and Ground Fault equipment is mounted in rack. Interconnect wiring completion awaiting manpower availability. LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 10 /15

Work continuing on Collimator mounting/rotation system: RC1 Design progress Work continuing on Collimator mounting/rotation system: U-Joint Drive Axle Assembly. Detail drawings are complete. End Support and Rotator mechanism. Detail drawings are in work. Plan to release drawings as a Drive/Support Assy. package for fabrication by 16 Mar 07. LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 11 /15

RC1 Design progress cont’d Image Current Plate Design. Present RF spring loading requirements of a few 10s of grams per finger cause excessive deflection of the tie-rod portions of the Image Current Plate. Tie-Rods LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 12 /15

RC1 Design progress cont’d Challenges we face are the complexity of water cooling the tie-rods and dealing with the magnitude of above deflections. Pre-machining the opposite curvature into the part may work but other options could be less difficult/costly to implement. Reducing spring loading, if possible, in areas farther from the beam would help. Different RF spring configurations are being explored. A tie-rod less design is proposed. Original transition configuration (hourglass shape) is being re-considered as well. As a result some RF and Image Current questions arise so.. expert advice is needed. LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 13 /15

Revised RF Spring configuration Double Wedge Adapters mount across Tank ceiling & floor Jaw facet RF springs mount on Tank ceiling & floor 2 RF springs mount to each Adapter Shorter length springs also mount to Tank ceiling & floor Note: Jaw facet springs are wide enough for line contact thru full transverse travel range LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 14 /15

Alternate Sheet Metal Transition configuration NORMAL CONTACTS TO TANK CEILING & FLOOR RETRACTED 22.5MM HOURGLASS Note: Not all Jaw facets are shown RECTANGULAR ROUND LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 07 Mar 2007 No 15 /15