Fast particles

Understanding the complex interplay between energetic particles and Alfvén Eigenmodes (AE) is a key goal in the fusion research effort, encompassing not only the interpretation of current experiments but also, and most importantly, the planning and preparation of future DT experiments like the JET-DT campaign and burning plasmas during ITER operation.

Plasma radial displacement perturbation of a Toroidal Alfven Eigenmode in a Tokamak with a resonant passing orbit exchanging energy with the mode

Tokamak experiments worldwide addressing the dynamics of energetic ions in the presence of AE have clearly evidenced the ensuing particle redistribution and increase in particle loss to the Tokamak first wall, potentially impacting on future burning plasmas that rely on steady alpha particle populations.

The group is strongly committed to the investigation of energetic particle interactions with MHD modes and developed and extensively used the hybrid magnetohydrodynamic (MHD)-drift kinetic CASTOR-K code. Research activities ranges from fast ion effects on internal kink modes at JET to predictive assessment of alpha-driven AE in ITER plasma scenarios and stability assessment of AEs for future JET DT and JT-60SA scenarios.