CES Studies at CERN for the Interaction Region : -Summary of Linear Collider IR meeting at CERN held on 16 February Design Brief for external design specialists -Build-ability issues for concrete platforms underground -Conclusions J.Osborne (CERN) for CES 1

2

3 CLIC CDR Baseline Layouts for Interaction Region

ILC RDR Baseline Layouts for Interaction Region ILC Concrete platform concept / shaft layout / crane capacities still need to be finalised before CE study can start

5 ARUP’s matrix analysis strategy

6 ARUP’s were asked to tender for 4 distinct tasks

7 Air pads v Rollers for concrete platform movement will be further analysed

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9 2d and 3d models will be developed for CLIC to do a “Time-dependant” state analysis. Possible 2 nd phase use of these models for ILC layouts/geology.

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Budget for this Linear Collider IR study needs to be finalised : Possible cost sharing FNAL (Task 1) CERN (Task 2) Some key decisions for ILC were resolved at Eugene meeting : Are both detectors using the “concrete” platform strategy : Yes Are the level of the platforms the same ? For the overall layout : – Gantry crane capacity in the experimental hall ? – Should shafts be directly over the cavern or offset ? – Self shielding detectors : Yes 11

12 Steel plates with tangs placed on building floor slab Build-ability Issues for concrete platforms underground to be reviewed

Conclusions If everyone agrees, ARUP’s could proceed with : – Task 1 - funded by FNAL ? (approx. 50KCHF) – Task 2 - funded by CERN (approx. 50KCHF) This study will be of benefit to both ILC and CLIC projects Several ILC detector issues need to be resolved before the study can go to the next level of detail 13 J.Osborne (CERN) for CES