Experiments and ELM-Suppression in Double-Null \mbox{DIII-D} Plasmas

Experiments are underway on DIII-D to obtain ELM-suppression via resonant magnetic perturbations [1] in double-null (stellarator symmetric) configurations. While density pumpout was observed in these initial experiments, ELM suppression was not obtained. A previous attempt was unsuccessful. In this attempt we will investigate whether the difference in connection length between single and double null plays a critical role by varying the magnetic balance around a double-null configuration. Experimental results will be reported.\par \vskip8pt \noindent [1] T.E.~Evans, et al., Nature Physics {\bf 2}, 419 (2006).