Abstract
Resonant magnetic perturbations (RMPs) have been established as an efficient way of stabilizing edge localized modes (ELMs). Driving the scrape-off layer (SOL) currents can also generate RMP for ELMs control. A divertor biased target system (2 × 2 array) has been recently designed and installed on the HL-2A tokamak to drive the helical currents. There are two groups of biased targets (the high field side and the low field side, respectively) with each consisting of 2 targets separated from each other by 180° along the toroidal direction. Computed perturbation of magnetic field is found the resonant radial vacuum field component for n = 1 generated by the helical current in the q95 surface can reach 12.5 Gs/kA. Computation of the width of vacuum magnetic islands and the magnetic field topology for n = 1,2 RMP evidently indicates utilizing the divertor biased targets system can mitigate or suppress the ELMs.
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