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FP5

HITRAP Informe resumido

Project ID: HPRI-CT-2001-50036
Financiado con arreglo a: FP5-HUMAN POTENTIAL
País: Austria

Simulation codes for calculation of interaction of HCI with surfaces, clusters and micro-structures

Monte Carlo calculations of ion trajectories for designing a scattering chamber for ion-surface interactions were performed. The so-called trampoline effect was studied in order to find out whether a reflection of incompletely neutralized projectiles will take place due to the surface charge resulting from the electron capture by the very same projectile. It was found that for charge states up to q = 10 such an effects is very unlikely.

Simulations for transmission through nanocapillaries based on the classical transport theory were performed. The discharge characteristics from the macroscopic properties of the nanocapillary material could be incorporated. The bulk discharge time or bulk diffusion constant as well as the surface charge diffusion constant were estimated from surface and bulk conductivity data for Mylar. This approach represents a mean-field classical trajectory theory based on a microscopic classical-trajectory Monte Carlo (CTMC) simulation for the ion transported, self-consistently coupled to the charge-up of and charge diffusion near the internal capillary walls. This has lead to a satisfactory description of the experimental data from the Stockholm node of this network (Vikor, Schuch et al.) for the angular dependent transmission probability. Furthermore, inconsistencies of an earlier non-linear model (Stolterfoht et al.) could be resolved.

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Institute for Theoretical Physics, Vienna University of Technology
Wiedner Hauptstrasse 8-10
1040 Vienna
Austria
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