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Puppel, P.

Paper Title Page
MOPD16 Simulation of the Long Term Beam Intensity Performance of the NEG-coated SIS18 91
  • P. Puppel, P.J. Spiller
    GSI, Darmstadt
  • U. Ratzinger
    IAP, Frankfurt am Main

The StrahlSim code was developed to simulate dynamic vacuum effects and charge exchange beam loss in heavy ion accelerators. The code accounts for the charge exchange cross sections at the actual beam energy, the loss positions of charge exchanged ions, and the pressure rise caused by desorption due to the impact of these ions onto the vacuum chamber. Recent progress was made by implementing time dependent longitudinal pressure profiles in StrahlSim. This allows to simulate localized pressure bumps during a cycle and therefore to estimate the lifetime of NEG-coated surfaces depending on their positions in the ring, and the corresponding influence on the beam performance over the saturation process. The new code was applied to SIS18 considering two scenarios. One calculation has been carried out for the currently available U28+ intensities of 2·1010 extracted particles per cycle, and the other calculation for the proposed FAIR booster operation with 1.5·1011 extracted particles per cycle. Results for both scenarios will be presented in this work.