Abstract
The suppression and excitation of Alfvén eigenmodes have been experimentally obtained, for the first time, by means of externally applied 3D perturbative fields with different spatial spectra in a tokamak plasma. The applied perturbation causes an internal fast-ion redistribution that modifies the phase-space gradients responsible for driving the modes, determining, ultimately their existence. Hybrid kinetic-magnetohydrodynamic simulations reveal an edge resonant transport layer activated by the 3D perturbative field as the responsible mechanism for the fast-ion redistribution. The results presented here may help to control fast-ion driven Alfvénic instabilities in future burning plasmas with a significant fusion born alpha particle population.
| Original language | English |
|---|---|
| Article number | 035101 |
| Pages (from-to) | 1-6 |
| Number of pages | 6 |
| Journal | Physical Review Letters |
| Volume | 130 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 20 Jan 2023 |
| MoE publication type | A1 Journal article-refereed |
Funding
This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreement No. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The support from the Spanish Ministry of Science (Grant No. FPU15/06074) is gratefully acknowledged. The mega and ascot simulations reported herein were performed on the MARCONI cluster under the MEGAFILD project.