Abstract
The nonlinear dynamics of isolated, near-threshold waves is studied in the presence of strong resonant particle scattering. In this limit, a simple closed-form analytical solution is found and compared with numerical simulations, which shows reasonable agreement when the wave evolves quasi-steadily to saturation, even for moderate tokamak-relevant collisionality levels. The solution can be useful in verifying codes that deal with Alfvénic instabilities and thermal plasma turbulence in fusion plasmas, as well as a rapid means for predicting and analyzing experimental outcome.
| Original language | English (US) |
|---|---|
| Article number | 044003 |
| Journal | Nuclear Fusion |
| Volume | 59 |
| Issue number | 4 |
| DOIs | |
| State | Published - Feb 27 2019 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
Keywords
- Alfvén wave
- mode saturation
- nonlinear dynamics
- wave instability