Abstract
The influence of the separatrix on the stability of edge current driven
external kink (peeling) modes has been studied. Two approaches have been
compared: taking the limit towards the separatrix using linear ideal and
resistive MHD stability codes and including the complete x-point
geometry using a new resistive MHD code. A strong stabilizing effect has
been observed for the ideal and the resistive peeling mode for
instabilities driven by the edge current gradient. Both approaches are
in good agreement. A new resistive instability remains unstable and is
not significantly affected by the separatrix. This mode is a combination
of a kink and a tearing type mode and could be called a
peeling-tearing mode.
| Original language | English |
|---|---|
| Pages (from-to) | 2107-2121 |
| Journal | Plasma Physics and Controlled Fusion |
| Volume | 47 |
| Issue number | 12 |
| DOIs | |
| Publication status | Published - 1 Dec 2005 |
| Externally published | Yes |