The change in nonlinear energetic particle mode (EPM) dynamics that accompanies the transition from weak to strong energetic ion transport is discussed in this work. It is demonstrated that the nonlinear threshold in fast ion energy density for the onset of strong convective transport occurring in avalanches is close to the linear EPM excitation threshold. This phenomenology is strictly related to the resonant character of the modes, which tend to be radially localized where the drive is strongest. After the convective loss phase, during which nonlinear EPM mode structure is displaced outwards, fast ion transport continues owing to diffusive processes. Theoretical analyses, presented here, are the basis for consistency analyses of operation scenarios in proposed burning plasma experiments. Comparisons between theoretical predictions and both simulation and experimental results are also briefly discussed. © 2005 IAEA, Vienna.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Condensed Matter Physics
- Nuclear and High Energy Physics
Zonca, F., Briguglio, S., Chen, L., Fogaccia, G., & Vlad, G. (2005). Transition from weak to strong energetic ion transport in burning plasmas. Nuclear Fusion, 45(6), 477 - 484. https://doi.org/10.1088/0029-5515/45/6/009