Abstract
A new type of fast particle instability involving axisymmetric modes in magnetic fusion tokamak plasmas is presented. The relevant dispersion relation involves three roots. One corresponds to a vertical plasma displacement that, in the absence of active feedback stabilization, grows on the wall resistivity time scale. The other two, oscillating close to the poloidal Alfvén frequency, are normally damped by wall resistivity. The resonant interaction with fast ions can drive the oscillatory roots unstable. Resonance conditions, stability thresholds and experimental evidence are discussed.
| Original language | English (US) |
|---|---|
| Article number | 064002 |
| Journal | Nuclear Fusion |
| Volume | 62 |
| Issue number | 6 |
| DOIs | |
| State | Published - Jun 2022 |
| Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
Keywords
- axisymmetric MHD modes
- energetic particle confinement and stability in magnetically confined plasmas
- theory of tokamak fusion plasmas
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