Effect of magnetic island geometry on ECRH/ECCD and consequences to the NTM stabilization dynamics
1 Department of Physics, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece
2 School of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece
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In the majority of codes that model ECCD-based NTM stabilization, the analysis of the EC propagation and absorption is performed in terms of the axisymmetric magnetic field, ignoring effects due to the island topology. In this paper, we analyze the wave propagation, absorption and current drive in the presence of NTMs, as well as the ECCD-driven island growth, focusing on the effect of the island geometry on the wave de-position. A primary evaluation of the consequences of these effects on the NTM evolution is also made in terms of the modified Rutherford equation.
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