Author: Jonker, M.
Paper Title Page
TUPFI012 HL-LHC: Integrated Luminosity and Availability 1352
  • A. Apollonio, M. Jonker, R. Schmidt, B. Todd, S. Wagner, D. Wollmann, M. Zerlauth
    CERN, Geneva, Switzerland
  The objective of LHC operation is to optimise the output for particle physics by maximising the integrated luminosity. An important constraint comes from the event pile–up for one bunch crossing that should not exceed 140 events per bunch crossing. With bunches every 25 ns the luminosity for data taking of the experiments should therefore not exceed 5*1034 s−1cm-2. For the optimisation of the integrated luminosity it is planned to design HL-LHC for much higher luminosity than acceptable for the experiments and to limit the initial luminosity by operating with larger beam size at the collision points. During the fill, the beam size will be slowly reduced to keep the luminosity constant. The gain from luminosity levelling depends on the average length of the fills. Today, with the LHC operating at 4 TeV, most fills are terminated due to equipment failures, resulting in an average fill length of about 5 h. In this paper we discuss the expected integrated luminosity for HL-LHC as a function of fill length and time between fills, depending on the expected MTBF of the LHC systems with HL-LHC parameters. We derive an availability target for HL-LHC and discuss steps to achieve this.  
THPFI061 Design Process of the Interlock Systems for the Compact Linear Collider 3433
  • P. Nouvel, M. Jonker, B. Puccio
    CERN, Geneva, Switzerland
  • H. Tap
    INPT, Toulouse, France
  Interlock systems are a critical part for the machine protection of linear colliders. Their goal is to inhibit the next pulse either on failure of critical equipment and/or on low beam quality evaluation. This paper presents the on-going process to validate design choices for the Compact Linear Collider (CLIC) interlock systems. The design process starts by establishing requirements. In mission-critical system case, they are mainly focused on the dependability. Moreover, the new concept of fast beam quality analysis has been introduced into the CLIC interlock system and will be discussed in this paper. To support the design process, experimentation on this concept has been launched. In addition, a hardware demonstration of the interlock systems has been set-up. It allows validating the design in concordance with the requirements.