1. TAS at IP1 Present situation and plans
François BUTIN
TS/LEA

2. TAS collimators geometry and environment
TAS is essentially a copper alloy cylinder with inner vaccum chamber
2130 mm long, 500 mm OD, 34 mm ID, mass 3,2 tons.
It is supported from the TX1S shielding at the interface UX15 / RB14-16
Handling is done with its cradle (cast iron tube, 150 mm thick, mass 6 tons
It is aligned WRT the machine geometry

13. Present situation
Both TAS are in place, roughly aligned on the beam line (+- 1 mm)
Final alignment can only be done once all ATLAS shielding is in place
Accuracy was stated to be microns, to be confirmed
The vaccum chambers are connected on Q1 side. On IP side, a connection test was performed (right side only).

16. Plans for the future
TAS was always planned to be « easily » removed from UX15, together with its 6 t cast iron shield cradle
Installation frame will be reinstalled, and TAS + cradle pulled onto it, then brought to surface with crane
For a TAS swap, a new cradle would have to be manufactured, taylored to new TAS dimensions

18. Plans for the future
Impact and level of activation need to be integrated in the removal procedure
Possible use of remote handling for some bolting operations on IP side

22. Plans for the future
Changes in surrounding TX1S shielding (375 tonnes) -if needed- will be more problematic…
But nevertheless possible within certain boundary conditions: fixed support tube casted in concrete, while main shield monobloc is bolted onto it.