Author: Fiascaris, M.
Paper Title Page
TUPMW014 Improved Aperture Measurements at the LHC and Results from their Application in 2015 1446
  • P.D. Hermes, R. Bruce, M. Fiascaris, H. Garcia, M. Giovannozzi, A. Mereghetti, D. Mirarchi, E. Quaranta, S. Redaelli, B. Salvachua, G. Valentino
    CERN, Geneva, Switzerland
  • R. Kwee-Hinzmann
    Royal Holloway, University of London, Surrey, United Kingdom
  • E. Quaranta
    Politecnico/Milano, Milano, Italy
  A good knowledge of the available aperture in the LHC is essential for a safe operation due to the risk of magnet quenches or even damage in case of uncontrolled beam losses. Experimental validations of the available aperture are therefore crucial and were in the past carried out by either a collimator scan combined with beam excitations or through the use of local orbit bumps. In this paper, we show a first comparison of these methods in the same machine configuration, as well as a new very fast method based on a beam-based collimator alignment and a new faster variant of the collimator scan method. The methods are applied to the LHC operational configuration for 2015 at injection and with squeezed beams and the measured apertures are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMW014  
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WEPMW006 First Design of a Proton Collimation System for 50 TeV FCC-hh 2423
  • M. Fiascaris, R. Bruce, D. Mirarchi, S. Redaelli
    CERN, Geneva, Switzerland
  We present studies aimed at defining a first conceptual solution for a collimation system for the hadron-hadron option for the Future Circular Collider (FCC-hh). The baseline collimation layout is based on the scaling of the present LHC collimation system to the FCC-hh energy. It currently includes a dedicated betatron cleaning insertion as well as collimators in the experimental insertions to protect the inner triplets. An aperture model for the FCC-hh is defined and the geometrical acceptance is calculated at top energy taking into account mechanical and optics imperfections. Based on these studies the collimator settings needed to protect the machine are defined. The performance of the collimation system is then assessed with particle tracking simulation tools assuming a perfect machine.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW006  
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