The goal of Long Shutdown 1 is to perform the full maintenance of equipment, and the necessary consolidation and upgrade activities in order to ensure reliable LHC operation at nominal performance from mid 2014.
Long Shutdown 1 concerns not only LHC but also its injectors. In order to ensure that resources will be available an analysis is in progress to detect conflict/overload and to decide...
At the end of 2012, the Large Hadron Collider will enter its first programmed long stop (LS1). The problem at the origin of 2008 incident will be definitely treated and the main circuits will then be able to run at the design current value without protection issues. At Chamonix 2011, a proposal was done for a series of powering tests to be performed just before the LS1 to investigate other...
All the activities necessary to consolidate the LHC superconducting circuits are given, especially the consolidation of the main splices, exchange of weak cryomagnets, the consolidation of the DFBAs and the special interventions. For each of them, the baseline strategy will be presented, highlighting the reasons that lead to these choices and the remaining risk level.
In particular, the...
The level of flux of hadrons with energy in the multi MeV range expected from the collimation system at Point 7 and from the collisions at the interaction Points 1, 5 and 8 will induce Single Event Errors (SEE) of the standard electronics present in equipment located around these Points. Such events would perturb the LHC operation. As a consequence, the sensitive equipment will be shielded or...
The last two years of LHC operation have highlighted concerns on the levels of the dynamic vacuum in the long straight sections (LSS) in presence of high intensity beams. The analysis of the existing data has shown relationship between pressures spikes and beam screen temperature oscillations or micro-sparking in the RF fingers of the bellows on one side and coincidence of pressure bumps with...
During the LHC operation in 2010 and 2011, the cryogenic system has achieved an availability level fulfilling the overall requirement. To reach this level, the cryogenic system has profited like many other beam-dependent systems from the reduced beam parameters. Therefore, impacts of some failures occurred during the LHC operation were mitigated by using the overcapacity margin, the existing...
