Stochasticity in fusion plasmas

摘要

In recent years the importance of externally imposed resonant magnetic fields on plasmas has become more and more recognized. These fields act either at well defined plasma layers, e.g. by ergodization or more globally by exciting large-size modes in the plasma. A major achievement of research in recent years is the possibility to suppress large type 1 ELMS by resonant perturbation fields which modify the transport at the plasma edge. This option has been studied extensively at DIII-D and recently progress has also been made at JET and TEXTOR. Several devices are preparing further experiments to study the important aim of avoiding transient heat pulses and thus to substantially increase the lifetime of ITER.