Abstract
Profiles of the ion density and bootstrap current in the vicinity of magnetic islands are investigated based on the first principles gyro-kinetic particle simulation via the gyro-kinetic toroidal code. The physics on the recovery of the ion density gradient inside the islands in various collision regimes is discussed. Simulation results show that for small magnetic islands, the ion density gradient can survive inside the island due to the combination effect of both the banana-orbit width of trapped ions and the drift-orbit displacement of passing ions. It is suggested that the recovery of the pressure gradient inside small islands may play a more important role in the reduction of driving force of the ion bootstrap current in the evolution of the neoclassical tearing mode, rather than the so-called finite banana-orbit effects.
Published Version
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