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Abstract

Powerful neutral beams used in magnetic fusion devices to heat the plasma to high temperatures must pass a region of finite background pressure where the magnetic stray field is very high. Reionisation of neutral beam particles and their subsequent deflection onto walls may lead to serious power loadings if no proper protection is provided. The simulation of this problem for the neutral beam injection system of the ASDEX-Upgrade tokamak is examined. The magnetic field distribution and the particle trajectories are calculated in full three-dimensional geometry. The statistical methods applied to simulate the beam particles necessary to obtain a reliable power density distribution on the various surfaces of the duct region are described. Results are given for different magnetic field configurations of the tokamak. Because of the focusing effect of the strongly varying magnetic field, power densities in excess of 2 MW/m2 are found in extreme cases.

Additional information

Authors: STÄBLER A, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);GÖTZ S, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SPETH E, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SIELANKO J, M C Sklodowska University, Institute of Physics, Lublin (PL);STABLER A, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);GOTZ S, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Article: Fusion Technology, Vol. 26 (1994) pp. 145-152
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