LHC Performance Workshop - Chamonix 2009

Session

Session 03 - Repair of 34

S03

3 Feb 2009, 08:30

Le Majestic (Chamonix)

Presentation materials

Minutes

SessionSummary20091902.doc

SessionSummary20091902.pdf

Proceedings

rs_3_00.pdf

46. Magnets repair for 3-4 sectors

Lucio Rossi

03/02/2009, 08:30

The incident in 3-4 sector has affected some 50 main LHC magnets. Such a scenario was never considered as realistic in the past. Our reserve of magnet has been barely sufficient (some 40 dipoles and 14 SSS, in some cases the reserve magnet types are not compatible with the one damaged). Furthermore the subsequent measurements on other sectors have shown the necessity to replace other magnets....

47. Reinstallation and interconnections

Francesco Bertinelli

03/02/2009, 09:10

Reinstallation of the first magnets in the D-zone has already started in parallel with the removal of damaged magnets. It is planned for the last magnets to be reinstalled by end March. The start of interconnection (IC) work requires a minimum chain of adjacent magnets and their alignment: it is planned to start this in late February. IC work will now be performed by CERN and FSU staff, no...

99. Vacuum system – how to get ready for beam ?

Dr Vincent Baglin

03/02/2009, 09:45

During the incident of sector 3-4, the two beam vacuum sectors of 2.8 km each and four insulation vacuum sectors i.e. 750 m were vented to atmospheric pressure. Besides the mechanical damages of the nested bellows and plug-in-modules due to the mouvement of the cold masses under the helium pressure, soot and debris of superinsulation were spread inside the beam and insulation vacua. The...

82. Other systems – what needs to be done? Repair and reinstallation of other systems (standard QPS, PC, BLM, Cryo, Survey, …)

Solfaroli Camillocci Matteo

03/02/2009, 10:50

After the incident occurred on the 19th September all equipment and systems (such as QPS racks, PC, BLM, Cryo instrumentation control etc.) located in the tunnel, especially in the incident affected area, were removed from the tunnel in order to allow an easy damage inspection. After a change or repair, during the re-installation phase, all these equipments will be put back in the tunnel and...

68. Consolidation after beam operation – constraints from radiation protection considerations

Doris Forkel-Wirth

03/02/2009, 11:20

Since 10th September 2008 a major part of the LHC installation is classified as Supervised Radiation Area. As soon as LHC operation will be resumed in 2009, beam losses will inevitably increase the activation of accelerator and detector components, the maintenance and repair teams of the accelerator and the detectors risk to be exposed to elevated radiation levels. To reduce dose to personnel...