Measurements of heavy ion beam losses from collimation

Details Measurements of heavy ion beam losses from collimation Measurements of heavy ion beam losses from collimation

2009-08-18

arxiv.org/abs/0908.2553v1

Phys.Rev.ST Accel.Beams 12:011001,2009

Physics

Accelerator Physics

12 pages, 20 figures

Scientific paper

10.1103/PhysRevSTAB.12.011001

The collimation efficiency for Pb 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 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.

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