Measurements of heavy ion beam losses from collimation

Bruce, RoderikLund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,CERN (författare)

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.

Av författaren/redakt...: Bruce, Roderik; Assmann, R. W.; Bellodi, G.; Bracco, C.; Braun, H. H.; Gilardoni, S.; visa fler...; Holzer, E. B.; Jowett, J. M.; Redaelli, S.; Weiler, T.; visa färre...

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