Speaker
Dr
Valentin Igochine
(Max-Planck-Institut für Plasmaphysik)
Description
Tearing mode formation after internal crash events like sawteeth or fishbones is one of the most important MHD processes that result in a big island structure and associated confinement degradation in tokamaks. This type of tearing mode formation is considered to be the most important for future fusion reactors like ITER, because large internal events provide strong magnetic perturbations and are thus able to trigger the mode already at very small normalized pressure values. The process implies magnetic reconnection at the rational surface, which has been investigated in great detail in the ASDEX Upgrade and DIII-D tokamaks. In this paper we show that such an internal crash event leads to an ideal kink mode which transforms into a tearing mode on a much longer timescale than the crash itself. Thus, the common belief of fast formation of a big island during the crash has to be revised.
| Country or International Organization | Germany |
|---|---|
| Paper Number | EX/P8-21 |
Primary author
Dr
Valentin Igochine
(Max-Planck-Institut für Plasmaphysik)
Co-authors
Dr
Anja Gude
(Max-Planck Institute for Plasma Physics)
Dr
Carlos Paz-Soldan
(General Atomics)
Edward Strait
(General Atomics)
Prof.
Hartmut Zohm
(Max-Planck-Institut für Plasmaphysik)
Dr
Jeremy Hanson
(Columbia University)
Prof.
Karl Lackner
(Max-Planck Institute for Plasma Physics)
Prof.
Sibylle Günter
(Max-Planck Institute for Plasma Physics)
