arup studies update ilc interaction region design requirements john osborne cern, yung loo &...
TRANSCRIPT
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
2
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.
3
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.
4
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
5
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
6
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
7
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
8
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?
9
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
10
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
11
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?
12
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?
13
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)
14
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.