THE DECISIVE ROLE OF M=1 AND M=2 PERTURBATIONS IN DENSITY LIMIT DISRUPTIONS ON TEXTOR

Citation
Gl. Kuang et G. Waidmann, THE DECISIVE ROLE OF M=1 AND M=2 PERTURBATIONS IN DENSITY LIMIT DISRUPTIONS ON TEXTOR, Acta physica Sinica, 5(1), 1996, pp. 58-70
Citations number
32
Categorie Soggetti
Physics
Journal title
ISSN journal
10003290
Volume
5
Issue
1
Year of publication
1996
Pages
58 - 70
Database
ISI
SICI code
1000-3290(1996)5:1<58:TDROMA>2.0.ZU;2-A
Abstract
The behavior of magnetohydrodynamic phenomena associated with disrupti ons of ohmically heated density limit discharges (q(a) = 3.9) in the T EXTOR tokamak has been investigated in detail. A minor disruption is d emonstrated to be only due to an m = 2 mode instability, possibly due to the magnetic reconnection of an m = 2 island. When the m = 2 mode o scillations cease, the internal m = 1 kink mode instability is drastic ally enhanced at once, twisting the plasma core considerably. If the t wisting is too strong, the twisted plasma core is inevitably displaced to the outside and brings cold plasma to the central region, leading to the energy quench at a major disruption.