Author: Meusel, O.
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MOPOR034 Numerical Space-Charge Compensation Studies and Comparison of Different Models 674
  • D. Noll, M. Droba, O. Meusel, U. Ratzinger, K. Schulte, C. Wiesner
    IAP, Frankfurt am Main, Germany
  The design of many Low-Energy Beam Transport sections relies on the presence of space-charge compensation by particles of opposing charge. To improve understanding of the processes involved in the built-up and steady-state, simulations using the Particle-in-Cell code bender were made. We will present the influence of various system parameters on the results. Furthermore, the electron velocity distribution was found to be approximately thermal. The spatial distribution can then be found by solving the Poisson-Boltzmann equation. Such a model for the electron distribution was implemented in a 2D PIC code and applied to typical beam transport situations. We will present results in comparison to the 3D simulations.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR034  
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WEPOY009 Simulation Study of Emittance Growth from Coulomb Explosion in a Charge Separator System After Stripping 3005
  • M. Droba, O. Meusel, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  Funding: BMBF-05P15RFRBA
A computer 3D particle-in-cell (PIC) simulation is used to examine the emittance growth of an intense heavy ion beam after a charge stripper. Multi-species dynamics of the bunched uranium beam with various charge states and including compensation electrons will be presented. The rms-emittance growth shows different behaviour in the horizontal, vertical and longitudinal planes, dependent on initial conditions, like a bunch size, beam current and phase space ellipse orientation. An optimization of initial parameters is therefore crucial for a successful and efficient post-acceleration. The role of the separation system and of co-moving electrons will be discussed for the example of the GSI-Unilac.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPOY009  
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