Ion-Banana-Orbit-Width Efect on Bootstrap Current for Small Magnetic Islands

摘要

A simple and direct theoretical method has been proposed to investigate the socalled ion-banana-orbit-width(IBW) efect on the bootstrap current in the region of magnetic islands generated by the neoclassical tearing mode(NTM).The result shows that,when the IBW approaches the island width,the(ion) bootstrap current can be partly restored inside the island while the pressure profile is flattened.This can lead to the reduction of the bootstrap current drive on the NTM.The strength of the IBW efect on the NTM is related to the safety factor and the inverse aspect ratio on the rational surface.