1. FCC-hh MDI 5 th Meeting Friday 13 th March 2015 Civil Engineering Layouts for Experimental Caverns – First Draft Charlie Cook (GS), John Osborne (GS)

2. Outline Detector space requirements (as understood from MDI 4 th Meeting) Cavern access CATIA models

3. Detector space requirements Detector Option Detector design Shaft/tunnel diameter Required dimensions for installation Option 1Solenoid Option 2Twin Solenoid28m65x30x36 Option 3Toroid14m86x36x42 Option 1 - SolenoidOption 2 - Twin Solenoid Option 3 – Toroid Extra space required for opening/closing & repair? “ ”

4. Detector space requirements Detector Option Detector design Shaft/tunnel diameter [m] Required dimensions for installation [m] Width of metallic structures/services [m] Cavern dimensions (LxWxH) [m] Span [m] Option 1Solenoid Option 2Twin Solenoid2865x30x36865x38x3638 Option 3Toroid1486x36x42886x44x4244 Option 1 - SolenoidOption 2 - Twin Solenoid Option 3 – Toroid

5. Detector space requirements Detector Option Detector design Shaft/tunnel diameter [m] Required dimensions for installation [m] Width of metallic structures/services [m] Cavern dimensions (LxWxH) [m] Span [m] Corner cavities [m] Span with cavities [m] Option 1Solenoid Option 2Twin Solenoid2865x30x36865x38x363812x543 Option 3Toroid1486x36x42886x44x424412x549 Option 1 - SolenoidOption 2 - Twin Solenoid Option 3 – Toroid

6. Cavern Access Shaft (vertical) vs. Inclined tunnel? 2800m 395m 3o3o

7. Cavern Access Shaft (vertical) vs. Inclined tunnel? 2800m 395m 3o3o Shaft Inclined tunnel ~400m ~3000m 6%

8. Cavern Access Option 2 - Twin Solenoid Access options Ø28m shaft Ø26m circular modules + 0.8m clearance for safety ~1.5x diameter of CMS shaft (Ø20m) Moderate CE challenge at depths ~200m Very high CE challenge at depths 300m-400m Roadheader 28mx7.5m inclined tunnel Ø28m Extremely large diameter tunnel Too large for Tunnel Boring Machine (TBM) Possible construction method could be roadheader excavation to create a rectangular cross-section (28m x 7.5m) Height of tunnel = 7.5m; assumes flatbed truck (2m) + ventilation ducts on tunnel ceiling (1m) + for safety (0.5m)

9. Cavern Access Option 3 - ToroidAccess options Ø22m shaft Moderate CE challenge at depths ~200m Very high CE challenge at depths 300m-400m Roadheader 5mx14m inclined tunnel Coil height (10.1m) + flatbed truck (2m) + ventilation duct (1m) + safety (0.9m) = 14m Width of coil/diameter of tube? Space to rotate final coil must be considered in any access option 14m 5m 1m 2m 10.1m 0.9m

10. CERN SITG VUE BA5 Twin Solenoid cavern with shaft Alcoves are not preferred solution by CE – increased cavern span Can detector requirements be met without these?

11. CATIA Model: ST0664602_01 36 m 38 m 65 m Ø28 m Twin Solenoid cavern with shaft Detector Option Detector design Shaft/tunnel diameter [m] Required dimensions for installation [m] Width of metallic structures [m] Cavern dimensions (LxWxH) [m] Span [m] Corner cavities [m] Span with cavities [m] Option 1Solenoid Option 2Twin Solenoid2865x30x36865x38x363812x543 Option 3Toroid1486x36x42886x44x424412x549

12. Twin Solenoid cavern with shaft

13. CERN SITG VUE BA5 Toroid cavern with inclined tunnel Alcoves are not preferred solution by CE – increased cavern span Can detector requirements be met without these? Tunnel boring machine excavated inclined tunnel shown here, not roadheader solution

14. CATIA Model: ST0664667_01 42 m 44 m 86 m Ø14 m Toroid cavern with inclined tunnel Detector Option Detector design Shaft/tunnel diameter [m] Required dimensions for installation [m] Width of metallic structures [m] Cavern dimensions (LxWxH) [m] Span [m] Corner cavities [m] Span with cavities [m] Option 1Solenoid Option 2Twin Solenoid2865x30x36865x38x363812x543 Option 3Toroid1486x36x42886x44x424412x549

15. Toroid cavern with inclined tunnel

16. Summary Cavern dimensions driven by space required by detector (installation, opening/closing, repair) plus extra width for metallic structures/services Access options include: Shaft (large shafts preferable in shallower locations) Inclined tunnel (a possible alternative in deep locations) Improving inclined tunnel design: Expansion at connection to the cavern for the rotation of final toroid coil Enter the cavern at a different angle in horizontal plane. Currently 90 o to beam line Explore limits for angle in vertical plane – 6-7% slope is maximum for truck access? Use of tracks could allow for more inclined tunnel + smaller ventilation ducts => smaller tunnel requirements Alcoves would considerably increase the cavern costs and could possibly represent a feasibility issue