STUB configuration Mats Pålsson www.europeanspallationsource.se 19-05-10

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

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.

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

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!

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

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.

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)

Which stub? Different configurations STUB 310-360 empty? (1500x1200)

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

Cables in Stub amount

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. 8-10 pipes/stub) Manage flow control Manage air pockets

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

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

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

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

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.

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

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

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