Author: Perrot, A.-L.
Paper Title Page
MOZB202 The First Long Shutdown (LS1) for the LHC 44
  • F. Bordry, S. Baird, K. Foraz, A.-L. Perrot, R.I. Saban, J.Ph. G. L. Tock
    CERN, Geneva, Switzerland
  The LHC has been delivering data to the physics experiments since the first collisions in 2009. The first long shutdown (LS1), which started on 14 February 2013, was triggered by the need to consolidate the magnet interconnections so as to allow the LHC to operate at the design energy of 14 TeV in the centre-of-mass. It has now become a major shutdown which, in addition, includes other repairs, consolidation, upgrades and cabling across the whole accelerator complex and the associated experimental facilities. LS1 will see a massive programme of maintenance for the LHC and its injectors in the wake of more than three years of operation without the long winter shutdowns that were the norm in the past. The main driving effort will be the consolidation of the 10,170 high-current splices between the superconducting magnets. The presentation describes first the preparation phase with the prioritisation of the activities, the building of the teams and the detailed planning of the operation. Then, it gives the status after 3 months and the restart plans for all CERN accelerators. First lessons learnt for the 2nd long shutdown (LS2) will conclude the presentation.  
slides icon Slides MOZB202 [13.675 MB]  
TUPFI013 LHC Long Shutdown: A Parenthesis for a Challenge 1355
  • K. Foraz, M. Arnaud, M.B.M. Barberan Marin, C. Bedel, M. Bernardini, J. Coupard, J. Etheridge, H. Gaillard, S. Grillot, E. Paulat, A.-L. Perrot
    CERN, Geneva, Switzerland
  After three fruitful years of operation, the LHC will enter a long shutdown. Major works will be implemented to allow running safely at 7TeV/beam. The LHC superconducting circuits will be consolidated; mitigation measures will be carried out to reduce the single event effects occurrence in the frame of the Radiation To Electronics mitigation project (R2E); all the equipment will be fully maintained. In parallel, numerous consolidation and upgrade activities will be performed all around the 27km ring. The schedule has been optimized in order to reduce the length of the shutdown (LS1) to 22 months (including hardware commissioning). The organization of the works is therefore essential to ensure a safe and reliable plan. This paper introduces the various activities to be performed and presents the schedule and the preparation process, including the operational safety aspects.  
WEPEA041 Actions To Mitigate The Radiation Damage to Electronics at the LHC 2591
  • A.-L. Perrot, M.B.M. Barberan Marin, J.-P. Corso, K. Foraz, M. Lazzaroni, Y. Muttoni
    CERN, Geneva, Switzerland
  The level of flux of hadrons with energy in the multi MeV range expected from the collisions at the LHC interaction Points 1, 5 and 8 and from the collimation system at Point 7 will induce Single Event Errors (SEEs) in the standard electronics present in many of the control equipment installed in LHC underground. Furthermore, a risk of SEEs induced by thermal neutrons cannot be excluded. Such events would perturb the LHC operation, possibly leading to a stop of the machine. Main mitigation actions will be implemented during the first LHC Long Shutdown of 2013/2014 (LS1) to reduce the SEE occurrence. This paper summarizes the mitigation measures and their associated foreseen improvements in terms of SEEs. It presents the organization process and associated planning highlighting the impacts with the overall LHC LS1 planning and the main concerns during implementation.