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

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Outline

– Heater Test hardware & misc tests update

– RC1 design progress

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Molybdenum Half Shafts & Copper Hub Halves braze preparations

Expander Plug Retainer Ring

Shafts are nowready to assemble into Mandrel

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Coil and Jaw brazing fixture

Remaining fixture parts scheduled for completion on 12/17/07

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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 theU-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.

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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.

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“Sheath” concept for transverse RF seal

Paired spiral type RF Springs fit inside loop for balanced loading

Sheath may require slits at 3mmintervals along loop sides toprevent wrinkling

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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”

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Short RF Test Jaw with End Socket mounted

End Socket

Bearing Race

SiN4 balls

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Section showing RF Spring location

Slot for Spiral RF Spring

SiN4 ball bearings support End SocketMandrel & Shaft not shown

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End Socket RF Spring groove detail

82 degrees

Groove width ~ 1mm0.12 mm from edge

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Up Beam end detail from back side