Dick Loveless EMU Operations mtg 18 January 2012 1

Endcap Shielding• Design Goals

• Shield the endcap beam pipe so maintenance workers are not irradiated

• Estimate 2 cm of Pb is sufficient – 2.5 tonnes• Easy to install – workers are not irradiated

• Protect the beam pipe from maintenance workers and falling objects

• Do not interfere with maintenance work on the chambers etc.

• Status• Conceptual design – beginning detailed drawings• Propose for Pb-free installation in LS1 (no beam

pipe!)

Dick Loveless EMU Operations mtg 18 January 2012 2

2500 KG of lead only 1290 kg estimated total

Length and weight comparison of YE1-YE2 shielding and YE2-YE3 shielding

This view represents length but not shape of shielding

YE1 closed and YE2 at 3.05m Physical gap is 2556mmYE2 at 3.9m and YE3 at 7.64m (delta 3740)

Physical gap is 3673mm

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YE1/2 shielding assembly extended with clam shells open

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YE1/2 shielding assembly extended with clam shells closed

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YE1/2 shielding assembly retracted with clam shells open

Lead half cylinders

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Step 1 shielding assembly is lowered into guide pinsEstimated lead weight is 1000kg

Guide pins

ME3 ME2

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Mounting and guidance concept

Guide rods extend out 200mm from the spacer ring

Permanent shielding mounts provide horizontal surface for feet to rest

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Mounting of guide rod

Quick release pin inserted here

Flange on pinrod

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Step 2 Assembly is lowered until it is low enough for extension into the spacer rings

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Step 3 assembly is extended into the spacer rings and the load is transferred from the crane to the spacer rings

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Step 4 Clam shell is closed around the beam pipe

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Step 5 feet are secured

Lips to constrain location

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Draft model of YE2/3 assembly in gap20mm of lead weighs 3600 kg

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Side view of ye2/3 assembly

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End view of shielding assemblyShielding clam shells in the open position

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End view of ye2/3 shielding assy

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Assembly without motor drive actuators. Uses crane to lower clam shell halves after the frame sets down.