LHC Performance Workshop - Chamonix 2010

Session

Session 2 – Magnets and splices consolidation shutdown 2010/2011

S02

25 Jan 2010, 17:00

Chamonix

7. Overview of all superconducting splices in the LHC machine

Nuria Catalan

25/01/2010, 17:00

We will first draw the inventory of the superconducting splices in the LHC machine and classify them by their criticality. The main issues for each splice type will be reviewed with a special emphasis on corrector circuits based on the past experience and knowledge accumulated during hardware commissioning. Finally, we will discuss the issues still open and the plan of action for the next months.

8. Minimum requirements for 13 kA splices

Arjan Verweij

25/01/2010, 17:25

I will first show the validation of the simulations, based on experimental data from three RQ joint samples, tested in FRESCA in the previous months, and containing different stabilizer defects. Then I will present updated plots for the simulated safe machine current versus joint defect size, both for the RB and RQ circuits, focusing on 7 TeV operation. Finally I will discuss if...

9. Status of splices in 13 kA circuits

Paolo Fessia

25/01/2010, 17:55

In this contribution we will review what it has been achieved in terms of quality for the 13KA splices during the reassembly of the sector 3-4 respect to the previous production. Issues and requirements that should guide the choices for future consolidation of these interconnects (including the insulation) will be addressed, providing a first view of the ongoing efforts to translate these...

10. Status of splices in 6 kA circuits

Jean-Philippe Tock

25/01/2010, 18:25

This paper gives a progress report on the work done and on-going in the frame of the task force on the LHC splices consolidation. First, an inventory of the superconducting 6 kA splices all around the LHC machine is given. Then one circuit is presented in detail (Q7L2). The method and results of superconducting splices resistance measurement are given. The so-called hand praying splices...

11. Scenarios for consolidations intervention

Francesco Bertinelli

25/01/2010, 18:55

A Task Force has been set up to prepare the necessary consolidation actions for 7 TeV operation, specifically for splices: the mandate, composition, roles, organization and working time frame are presented. Very preliminary considerations for consolidation scenarios are presented, considering workload, resources and durations.

12. Dipoles retraining for 7 TeV

Ezio Todesco

25/01/2010, 19:20

We outline the present understanding of the retraining of the main dipoles in the LHC sector 5-6 during 2008 hardware commissioning. Even though part of the observed retraining can be explained through the test of individual magnets taken during the production, there is an additional unexplained detraining. 6.5 TeV seems clearly at hand with a very limited retraining. We present the best...