ARUP Studies Update

ILC Interaction Region Design Requirements

John Osborne CERN, Yung Loo & Matt Sykes (ARUP)

CFS-ADI Joint Meeting - University of Tokyo - April 8-10, 2014

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ARUP - Study Mandate

• Review key requirements and specifications from the European Region LC IR & MDI studies.

• Review against the Asian Region design concept requirements.

• Compare and identify implications of any changes.

• Any potential changes to be registered. Recommendations / implications / adherence issues to be identified between the ILD/SID design criteria and the LC design for the Asian Region.

• Current on-going CFS meetings have focussed on Asian Region detector hall access optioneering (i.e. HT,VS,HT/VS).- Therefore review has been modified to aid current progress.- Potential for requirements review to aid decision process for

optioneering outcomes.

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Summary of ARUP – European Region Review of IR Cavern Layout Studies1. Geotechnical & Tunnelling Studies

• Design Concept for IR Cavern Layout.

• Invert Deformation Performance Requirements Identification.

• Geological Review & Geotechnical Modelling.

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Summary of ARUP – European Region Review of IR Cavern Layout Studies2. Mechanical Engineering Studies

• Design Concept for Detector Platform Movement System. Mechanical systems modelling.

• Slab Performance Requirements Identification.

3. Combined Geotechnical, Mechanical modelling Slab + Cavern design concept & requirements

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LC IR Design Requirements• CFS design considerations:- Requirements from European Region for LC IR detector hall

layout and MDI

• Preliminary identification of if/how requirements have been considered and impacted in:- Asian Region CFS – Experimental Hall 3D Deformation Analysis Presentation1

- Kitakami Mountains Geological Survey Report2

- Progress Report on IR Vertical Shaft Study3

• Identification of how requirements may help to differentiate between different layout options (i.e. HT / VS / HT&VS)

1. CFS weekly meeting presentation - 14.01.14

(Aspects to be clarified by Asian Region team - Japanese language report)

2. Oyo Corporation Report - 31.08.13

3. CFS weekly meeting presentation - 25.02.13

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LC IR Design RequirementsRequirement

Engineering Specification

Affected by Geotechnical Conditions?

Considered in Asian Region CFS Study?

Affected by cavern layout? i.e. HT/VS/HT&VS option

1Maximum Detector Weight

15000 tons

2Movement duration

5 hours ?

3 Speed > 1 mm/s ?

4Number of movements

10/year ?

5Limit of acceleration

0.05m/s2 ?

6Maintenance allowances

2m (On Beam) ? ?

7Maintenance allowances

6m (Off Beam) ? ?

8Positioning relative to beam

± 1mm (but driven by criteria 10) ? ?

9 Slab Vibration 20Hz ? ?

: Not Affected

: Affected / Considered in Asian Region Studies

?: Check with Asian Region Studies if has been considered

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LC IR Design RequirementsRequirement

Engineering Specification

Affected by Geotechnical Conditions?

Considered in Asian Region CFS Study?

Affected by cavern layout? i.e. HT/VS/HT&VS option

10Static deformation of platform

limited to ±2mm (only HT option)

11Layout configuration

“Z” – CLIC.CE-1.1700.0001.G (only HT option)

12Ground Conditions

CERN - Molasse Basin (Kitakami) N/A

13Machine platform footprint

20 x 20m

14Min. Distance between Detectors

15m ? ? (HT&VS option)

15Magnetic field at top of platform

<1,000 gauss ?

16Operating Temperature Range

20°C ±2°C ?

17Platform Movement System

Rollers or Air Pad ?

: Not Affected

: Affected / Considered in Asian Region Studies

?: Check with Asian Region Studies if has been considered

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Requirements affected by Geotechnical ConditionsAspects to consider9. Slab Vibration

- Asian Region Study considers a 3m thick slab. European Region Slab frequency limits are

based on: ILD slab - 2.2m thick | SiD slab - 3.8m thick. Effect of this on slab freq. req.?

- Potential seismic effects on vibration?

- Granite much stiffer than molasse, may lead to different dampening effects of detector hall

structure - potential dynamic effects may need to be considered in further analyses.

10. Static deformation of platform- Asian Region Study considers combined slab + invert deformation (elastic FE Analysis)

- Consideration of further deformation effects:

- Geomechanical/kinematic deformation?

- Seismic effects?

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Requirements affected by Geotechnical ConditionsAspects to consider11. Layout configuration

- Z-configuration has an advantageous geometry in terms of stress shielding effects on IR

compared with HT/’HT&VS’ options.

- Conceptually: Shafts and compact symmetric shape of Z-config may have a generally stiffer

structure, and non-cantilevered shape compared with HT option with access tunnel.

- HT option at greater comparative depth:

- Potentially greater overburden stresses

- Potentially increased engineered access tunnel excavation requirements

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20.000

25.000

42.0

00

22.6

00

5.00

0

1.10

0R5.000 R

15.0

00

EL.110.0m

EL.138.4m

EL.96.4m

EL.101.0m

150,000

18,000

20.000

25.000

42.0

00

22.6

00

5.00

0

1.10

0

R5.000 R15

.000

EL.110.0m

EL.138.4m

EL.96.4m

EL.101.0m

Requirements affected by Geotechnical ConditionsAspects to consider

90m

20.000

25.000

42.0

00

22.6

00

5.00

0

1.10

0

R5.000 R15

.000

EL.110.0m

EL.138.4m

EL.96.4m

EL.101.0m

150,000

18,000

90m200m

HTD11m Grad7%

Assembly Yd

DHStraight

5 SFTs1 Main SFT1 ILD SFT1 SiD SFT2 EV SFT

Assembly Yd Assembly Yd

Upper A/T

DHZ-shape

DH

Upper HT

HTD8m Grad10%

2 SFTs1 Main SFT1 UT/EV SFT

HT access (baseline) VS access HT & VS access

11. Layout configuration

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Requirements affected by Geotechnical ConditionsAspects to consider15. Magnetic field at top of platform

- Geological Survey [Oyo Corp]: ‘granite of the Kitakami Mountains is I-type granite of the

magnetite series.’

- Magnetite is highly magnetically susceptible. Further studies needed?

16. Operating Temperature Range- Mountainous regions may have localised densening of geothermal heat fluxes, especially in

valleys. Effect on heat exchange with caverns/tunnels and operating temperature? Opportunity

for heat exchanger for tunnel cooling / heat extraction?

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Potential non-geotechnical/tunnelling issuesAspects to consider6. Maintenance allowances

- Are HT/’HT&VS’ layouts space-proofed for maintenance allowances?

- e.g. Is there additional allowances for platform support spacing during slicing

14. Minimum distance between detectors

- Can 15m distance be maintained

on ‘HT&VS’ layout. Can this

distance be maintained when

either machine is on beamline?

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Potential non-geotechnical/tunnelling issuesAspects to considerAre there benefits to any of the access layouts in terms of shafts vs horizontal/inclined tunnel access for:

• Interventions points and emergency access

• Heat release, forced ventilation and potential Helium release

• Routes for maintenance and installation/removal access.

• CMS type assembly helps to mitigate the impact of any delays in the underground civil works (this implies VS Solution)

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Further Steps

• Confirmation of the identified ‘?’ requirements with Asian Region study teams.

• Identify their effects and which requirements need further assessment/discussion.

• Following continued development of the MDI design, to identify if these impact on geotechnical/tunnelling requirements

• Requirements gathering can be used as a decision aid to differentiate between the 3 access layout options. - To decide if requirements review should form part of this

decision process, or be a compliance tool which proceeds a developed choice on access layout.