UKAEA-CCFE-PR(25)301
Spatio-Temporal Turbulence Dynamics over the MAST-U Edge Transport Barrier Evolution
Detailed results are presented from the first experimental study of self-regulation between plasma relative density fluctuations and perpendicular velocity over limit cycle oscillations (LCO) across the edge and near scrape-off layer (SOL) regions of the MAST-U spherical tokamak. The start of the dithering phase is preceded by the localisation of the emissivity at the magnetic null point. The L-H-mode-like transitions of the LCOs are characterised by a decrease in the mean density fluctuations and a narrowing of the probability density functions (PDF) due to plasma turbulence suppression.