Dynamics of shear Alfvén waves and energetic particles are crucial to the performance of
burning fusion plasmas. This article reviews linear as well as nonlinear physics of shear …

The objectives of NSTX-U research are to reinforce the advantages of STs while addressing
the challenges. To extend confinement physics of low-A, high beta plasmas to lower …

A general theoretical framework for investigating the nonlinear dynamics of phase space
zonal structures is presented in this work. It is then, more specifically, applied to the limit …

Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal
Alfvén eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution …

A multi-diagnostic study of the fast ion losses and redistribution during toroidal Alfvén
eigenmodes at the Globus-M and Globus-M2 spherical tokamaks was performed. Mode …

The role of energetic particles (EPs) in fusion plasmas is unique as they could act as
mediators of cross-scale couplings. More specifically, EPs can drive instabilities on the …

The first experiments on noninductive current drive (CD) using lower hybrid waves in a
spherical tokamak are described. Waves at 2.45 GHz were launched by a 10 waveguide grill …

Alfvénic instabilities (AEs) are well known as a potential cause of enhanced fast ion
transport in fusion devices. Given a specific plasma scenario, quantitative predictions of (i) …

A general criterion is proposed and found to successfully predict the emergence of chirping
oscillations of unstable Alfvénic eigenmodes in tokamak plasma experiments. The model …

Large burst activity, identified as toroidal Alfvén eigenmode (TAE) avalanche, occurs
frequently in neutral-beam heated plasmas in National Spherical Torus Experiment (NSTX) …