1 Department of Physics, Technical University of Denmark2 Plasma Physics and Fusion Energy, Department of Physics, Technical University of Denmark3 unknown4 Culham Science Centre5 University of York6 Aalto University7 University of Oxford8 University of Liverpool9 Oak Ridge National Laboratory10 Institute of Plasma Physics11 Uppsala University12 Institute of Nuclear Fusion13 Eindhoven University of Technology14 FOM Dutch Institute for Fundamental Energy Research15 Research Institute for Materials Science16 University of Warwick17 University of California, Irvine18 Australian National University19 Durham University20 St. Petersburg State Polytechnical University21 Max Planck Institute22 Forschungszentrum Julich23 Dublin City University24 Imperial College of Science, Technology and Medicine25 ITER Cadarache26 College of William and Mary27 Association Euratom-CEA28 Aix Marseille Universite29 Abraham F. Ioffe Institute30 Institute of Plasma Physics and Laser Microfusion31 Culham Science Centre32 University of York33 Aalto University34 University of Oxford35 University of Liverpool36 Oak Ridge National Laboratory37 Australian National University38 St. Petersburg State Polytechnical University39 Forschungszentrum Julich40 Dublin City University41 College of William and Mary42 Aix Marseille Universite
New diagnostic, modelling and plant capability on the Mega Ampère Spherical Tokamak (MAST) have delivered important results in key areas for ITER/DEMO and the upcoming MAST Upgrade, a step towards future ST devices on the path to fusion currently under procurement. Micro-stability analysis of the pedestal highlights the potential roles of micro-tearing modes and kinetic ballooning modes for the pedestal formation. Mitigation of edge localized modes (ELM) using resonant magnetic perturbation has been demonstrated for toroidal mode numbers n = 3, 4, 6 with an ELM frequency increase by up to a factor of 9, compatible with pellet fuelling. The peak heat flux of mitigated and natural ELMs follows the same linear trend with ELM energy loss and the first ELM-resolved Ti measurements in the divertor region are shown. Measurements of flow shear and turbulence dynamics during L–H transitions show filaments erupting from the plasma edge whilst the full flow shear is still present. Off-axis neutral beam injection helps to strongly reduce the redistribution of fast-ions due to fishbone modes when compared to on-axis injection. Low-k ion-scale turbulence has been measured in L-mode and compared to global gyro-kinetic simulations. A statistical analysis of principal turbulence time scales shows them to be of comparable magnitude and reasonably correlated with turbulence decorrelation time. Te inside the island of a neoclassical tearing mode allow the analysis of the island evolution without assuming specific models for the heat flux. Other results include the discrepancy of the current profile evolution during the current ramp-up with solutions of the poloidal field diffusion equation, studies of the anomalous Doppler resonance compressional Alfvén eigenmodes, disruption mitigation studies and modelling of the new divertor design for MAST Upgrade. The novel 3D electron Bernstein synthetic imaging shows promising first data sensitive to the edge current profile and flows.