Active control of edge localized modes by radio frequency waves

The effect of radio frequency wave driven torque on edge localized mode !ELM" activity is studied. It is shown that the radio frequency driven torque causes transition of type I giant ELMs to the benign grassy ELM behavior. The efficiency of this process scales directly with minor radius and inversely with the plasma density. It is argued that the technique of active ELM control will be efficient in the present for moderate-sized machines and in the future for large machines. © 2000 American Institute of Physics. #S1070-664X!00"03410-8$