  Non-rotating (`locked') magnetic islands often lead to complete losses of
confinement in tokamak plasmas, called major disruptions. Here locked islands
were suppressed for the first time, by a combination of applied
three-dimensional magnetic fields and injected millimetre waves. The applied
fields were used to control the phase of locking and so align the island
O-point with the region where the injected waves generated non-inductive
currents. This resulted in stabilization of the locked island, disruption
avoidance, recovery of high confinement and high pressure, in accordance with
the expected dependencies upon wave power and relative phase between O-point
and driven current.
