1. STUB configuration Mats Pålsson www.europeanspallationsource.se

2. Agenda Intro Structure/space Thermal situation Fire Radiation Cables
Cooling
Next steps
Installation

3. STUBS Structure / Space
Dimensions of the concrete structure of the stubs are fixed and also it is decided that cabling and wave guides shall be routed together in the same space/stub.

4. Thermal situation
Maximum temperature of the signal cables for the different cases.

6. Imposed requirements No poly beads/pellets/boards/bricks! Fire
The Tunnel and the Gallery are two different fire compartments and it needs to be a 60 minutes barrier. Location is not specified. The fire barrier shall be nominally capable of confining fumes.
We can avoid Fire detection and suppression in the stub if:
60 min fire barrier in each end of the stub
non-combustible radiation shielding material (e.g. sand or concrete)
Cables are compartmentalized in e.g. closed metal cable trays/ducts
No combustible material in the stub that is not compartmentalized
Temperature shall not exceed 85℃
No compartment containing combustible material with section dimensions larger than 0,25x0,5m
No poly beads/pellets/boards/bricks!

7. Fire sealing
Fire protection/shielding outside of radiation shield both towards the tunnel and the gallery.

8. Imposed requirements Radiation
Radiation shielding between the accelerator tunnel and RF gallery is estimated to be equivalent to at least 2,6m of sand (minimum 1,8 g/cc). The shielding may be divided in sections.
There shall be no active exchange of air between the gallery and the lower part of the stub/tunnel.
Avoid water system running in the gallery down to the lower part of the stub/tunnel and back again.

9. Radiation shielding
Space for additional Radiation shielding (if needed)
Radiation shielding with sandbags and/or concrete blocks equivalent to 2,6m of sand (1,8g/cc)

10. Which stub? Different configurations
STUB empty? (1500x1200)

11. Which stub? Cable routing
Pictures from Lea’s
Accelerator Tunnel Cable Feeding Plan
Technical Report
Figure 7, coaxial RF cables

12. Cables in Stub amount

13. Cooling of waveguides (Stubs)
Cooling with water from Tunnel side
Cooling by conduction by running pipes on:
Waveguides
power cable trays (lower part of stub section)
Cable trays or a “temperature shield” between wave guides and signal cables (upper part of the stub section)
Interface:
Connect on “existing” cooling water in the tunnel
Manifolds to collect cooling pipes (approx pipes/stub)
Manage flow control
Manage air pockets

14. Cooling of waveguides (Stubs)
Cooling system
Collection pipes/manifold
Copper tubes

15. Cooling of waveguides (Stubs)
The copper tube needs to be applied to the wave guides and cable compartments with a certain “full contact” area/meter to ensure required heat transportation.
Aluminium profile
Copper tube
Wave guide

16. Cooling of waveguides (Stubs)
Control cables
In closed metallic compartment
Alternative
Temperature shield
Wave guide
Power cables
Copper tubes

17. Cooling of waveguides (Stubs)
Full length copper tubes inside the stubs without joints to minimize the risk of leakage

18. Final Proposal (cooling water from the tunnel)
Connect pipes to cooling system in the tunnel and route the piping down to collection pipes outside of the stubs that needs active cooling. To this collection pipe there will be copper tubes connected. The copper tube needs to be applied to the wave guides with a certain “full contact” area/meter to ensure required heat transportation.
Cabling inside the stubs shall be in metallic (galvanized steel) cable trays (compartments). Copper tubes shall be applied at the trays for control- and signal cables to ensure that the maximum temperature not will be exceed. Copper tubes also shall be applied at the trays for power cables to remove the heat load from the cables.
All piping inside the stubs shall be without joints to minimize the risk of leakage i.e. full length copper tubes.
If lower temperature is required the contact area between tubing and wave guide shall be increased and also low temperature cooling system is to be considered.
Radiation shielding with sandbags and/or concrete blocks equivalent to 2,6m of sand (1,8g/cc) to meet required shielding. These shall be configured in the lower and the upper part of the stub.
Fire protection/shielding outside of radiation shield both towards the tunnel and the gallery.

19. Ongoing in Utgård
Mock up to learn characteristics of cables and cable trays:
Bending radius
Cable pulling
Bundling
Space required
Configuration
Vertical routing
Etc.

20. Next Steps Cable pull results Layout of configuration of cables
Cable tray/conduit design
Detailed WG-Cooling tube contacts
Water header design
Temp maps of final solution
Overall summary

21. Installation Topics: Cable trays WG supports WG Bundling cables
Pull cables
Lay cables
Clamp water tubes
Shield backfilll
Fire seal