Observations of secondary structures after collapse events occurring at the q = 2 magnetic surface in the TEXTOR tokamak
- Resource Type
- Authors
- K. Löwenbrück; H. R. Koslowski; A. Krämer-Flecken; G. Bertschinger; Y. Liang; R. C. Wolf; O. Zimmermann
- Source
- Nuclear Fusion. 47:L21-L25
- Subject
- Physics
Surface (mathematics)
Nuclear and High Energy Physics
Tokamak
Field (physics)
Separatrix
Divertor
Collapse (topology)
Plasma confinement
Condensed Matter Physics
law.invention
Physics::Plasma Physics
law
Tearing
Atomic physics
- Language
- ISSN
- 1741-4326
0029-5515
Collapse events at theq= 2 surface occurring during the mode locking process of anm/n= 2/1 tearing mode have been observed on TEXTOR. The plasma confinement within theq= 2 surface collapses without much influence on the width of the island (O-point). With an external rotating resonant magnetic perturbation (RMP) field induced by the dynamic ergodic divertor, secondary structures moving near the separatrix of the primary large 2/1 island with the same frequency as the RMP have been observed after the collapse events. The plasma confinement recovers when the secondary structures vanish.