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Humbel, J.M.

Paper Title Page
TUO2A03 Challenges in Simulating MW Beams in Cyclotrons 295
  • Y.J. Bi
    Tsinghua University, Beijing
  • A. Adelmann, R. Dölling, J.M. Humbel, W. Joho, M. Seidel
    PSI, Villigen
  • C.-X. Tang
    TUB, Beijing
  • T.J. Zhang
    CIAE, Beijing

The 1.3 MW of beam power delivered by the PSI 590 MeV Ring Cyclotron together with stringent requirements regarding the controlled and uncontrolled beam losses poses great challenges with respect to predictive simulations. A new particle matter interaction model in OPAL is taking into account energy loss, multiple Coulomb scattering and large angle Rutherford scattering. This model together with the 3D space charge will significantly increase the predictive capabilities of OPAL. We describe a large scale simulation effort, which leads to a better quantitative understanding of the existing PSI high power proton cyclotron facility. The initial condition for the PSI Ring simulations is obtained from a new time structure measurements and the many profile monitors available in the 72 MeV injection line. A large turn separation and narrow beam size at the extraction turn is obtained. We show that OPAL can precise predict the radial beam pattern at extraction with large dynamic range (3-4 orders of magnitude). The described capabilities are mandatory in the design and operation of the next generation high power proton drivers.


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