A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 1

Meeting of Working Group A: 13 Aug 07

Proposal for an

Experimental Area

With only One Large Shaft

A. Hervé/CERN

 A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 2

Starting point

• On the suggestion of Andrei, we have looked at the possibility of having only one large 18 m shaft, plus another 9 m shaft.

• We have positioned these two shafts outside the footprint of the main underground hall to to do away with interferences between loading/unloading areas and working areas.

• This solution has been used for 3 of the 4 LEP experiments, Aleph, Delphi, Opal.

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 A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 3

Implications

• It necessitates horizontal transport from under the shafts to the experimental cavern, but this is not a problem for a full surface assembly scenario.

• The experiments are assembled underground on their own transport platform.

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General view

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Main servicecavern machine & Exp B

Second servicecavern Exp A

A

B

Main 18 m shaft

Secondary9 m shaft

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Top view

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Pressurized Egress tunnels

Second servicecavern Exp A

Main servicecavern machine & Exp B

Access 20-t loads Exp B

Access Heavy Loads

80-t loads Exp A & B

 A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 6

Side view

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18 mLift

Stair80-t craneExp A & B

9 mLift

Stair20-t craneMachine& Exp B

Main ventilation ductsAnd services Exp A

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2D top view with dimensions

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 A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 8

2D side view with dimensions

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Longitudinal positions

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Movements of Experiment A

Exp B

1

2

3

1: to main unloading zone2: to garage position and leave space for experimentB in unloading zone3: beam/garage position

A

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Movements of Experiment B

1

2 3B

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Movements of Experiment B

3

21

1: to main unloading zone2: to garage position3: beam/garage position

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Surface

• During 1st phase, there is only one large assembly halls for Exp A and Exp B, sharing three 80-ton cranes

• During second phase, there is a side hall covering the main shaft. One 80-ton crane is used there with a 12 m crane hook, reaching to half the main assembly hall.

• The main assembly hall is left witht two 80-ton cranes with a 19-m crane hook, allowing easing transfer of loads between the three cranes.

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 A. Hervé - 13 august 2007 ILC-IRENG07-0813-4347 14

B

A

Surface 1st phase

3 80-ton cranes19-m crane hook

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B

A

Surface 2nd phase

2 80-ton cranes19 m crane hook

1 80-ton cranes12 m crane hook

Trucks

Movement of pieces