The theory of transport across a low mode number magnetic island belt driven by the ionization instability, elongated along the last entire q rational surface, and extending beyond the separatrix leads to a number of predictions which are in agreement with observations in DIII-D, TEXTOR, ASDEX and CCT. It also suggests that transition to a regime characterized by an improved confinement should occur at a sufficiently high heating power level.
Electron transport barrier and high confinement in configurations with internal islands close to the plasma edge of W7-X