Measurements of heavy ion beam losses from collimation

Roderik Bruce, R. W. Assmann, G. Bellodi, C. Bracco, H. H. Braun, S. Gilardoni, E. B. Holzer, J. M. Jowett, S. Redaelli, T. Weiler

Research output: Contribution to journalArticlepeer-review


The collimation efficiency for Pb-208(82+) ion beams in the LHC is predicted to be lower than requirements Nuclear fragmentation and electromagnetic dissociation in the primary collimators create fragments with a wide range of Z/A ratios, which are not intercepted by the secondary collimators but lost where the dispersion has grown sufficiently large. In this article we present measurements and simulations of loss patterns generated by a prototype LHC collimator in the CERN SPS. Measurements were performed at two different energies and angles of the collimator. We also compare with proton loss maps and find a qualitative difference between Pb-208(82+) ions and protons, with the maximum loss rate observed at different places in the ring. This behavior was predicted by simulations and provides a valuable benchmark of our understanding of ion beam losses caused by collimation.
Original languageEnglish
Article number011001
JournalPhysical Review Special Topics. Accelerators and Beams
Issue number1
Publication statusPublished - 2009

Subject classification (UKÄ)

  • Accelerator Physics and Instrumentation


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