Abstract
The formation of resonant islands and the ergodization of magnetic field lines in the tokamak boundary due to the subsidiary helical coils are numerically analyzed for the wall-lapping plasma concept as a non-divertor scenario for a reactor-relevant tokamak. The parameters are taken referring to the R-tokamak, a reacting plasma project in IPP-Nagoya. We have verified that this concept could be realized using the rotating islands produced by three sets of helical coils carrying alternating currents with shifted phases. It is also shown that this is possible by using local helical coils which span limited toroidal regions of the torus.
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