  New results from MAST are presented that focus on validating models in order
to extrapolate to future devices. Measurements during start-up experiments have
shown how the bulk ion temperature rise scales with the square of the
reconnecting field. During the current ramp up models are not able to correctly
predict the current diffusion. Experiments have been performed looking at edge
and core turbulence. At the edge detailed studies have revealed how filament
characteristic are responsible for determining the near and far SOL density
profiles. In the core the intrinsic rotation and electron scale turbulence have
been measured. The role that the fast ion gradient has on redistributing fast
ions through fishbone modes has led to a redesign of the neutral beam injector
on MAST Upgrade. In H-mode the turbulence at the pedestal top has been shown to
be consistent with being due to electron temperature gradient modes. A
reconnection process appears to occur during ELMs and the number of filaments
released determines the power profile at the divertor. Resonant magnetic
perturbations can mitigate ELMs provided the edge peeling response is maximised
and the core kink response minimised. The mitigation of intrinsic error fields
with toroidal mode number n>1 has been shown to be important for plasma
performance.
