LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 1 /12 LARP Phase II Secondary Collimator RC1 Collimator Development and Test Program Status Revised 12/10/07

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 2 /12 Outline –Heater Test hardware & misc tests update –RC1 design progress

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 3 /12 Molybdenum Half Shafts & Copper Hub Halves braze preparations Expander Plug Retainer Ring Shafts are now ready to assemble into Mandrel

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 4 /12 Coil and Jaw brazing fixture Remaining fixture parts scheduled for completion on 12/17/07

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 5 /12 Moly U-Joint to Moly Shaft Braze Tests Pure Copper 25% Gold 75% Copper Wetting Test Samples confirm adequacy of Gold-Copper Alloy for a Moly-moly joint U-Joints actually get brazed with 35/65 so a additional wetting test is planned for 12/10/07. Fillets on outside of joint confirm that both gravity orientations of the U-joints during brazing will bond. Joint is good! However, alloy bonded the “diaphragm” to the “Shaft” end in several spots. A additional test with a wider gap will ensure full diaphragm travel. 35/65 alloy to be used for final test.

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 6 /12 RC1 Design progress –RF & Image Current System Concepts (see next 3 slides) Paired spiral style RF springs balance the loading on the RF “Sheath”. –Samples on order. Beam pipe id to 58mm square geometry is built into Tank ends. Thin copper “Curtains” bridge Tank end geometry to “End Socket”. End Sockets mount on ceramic ball bearings in Jaw ends. –Detail drawings of prototype bearing assembly to start this week. Spiral style RF spring retained in groove at each End Socket. –Samples in-house and tests are planned. RF Springs and Curtains stabilize End Socket during Jaw rotation.

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 7 /12 “Sheath” concept for transverse RF seal Paired spiral type RF Springs fit inside loop for balanced loading Sheath may require slits at 3mm intervals along loop sides to prevent wrinkling

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 8 /12 Up Beam end detail beam side view Spiral style backing springs reside inside “Sheath” (sheath not shown) Round to Square Transition Thin sheet metal RF “Curtain”

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 9 /12 Short RF Test Jaw with End Socket mounted End Socket Bearing Race SiN4 balls

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 10 /12 Section showing RF Spring location Slot for Spiral RF Spring SiN4 ball bearings support End Socket Mandrel & Shaft not shown

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 11 /12 End Socket RF Spring groove detail 82 degrees Groove width ~ 1mm 0.12 mm from edge

LARP LHC PHASE II COLL RC1 TESTS - S. Lundgren 10 Dec 2007 No 12 /12 Up Beam end detail from back side