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Acta Physica Sinica (Overseas Edition), 1996, Vol. 5(1): 58-70    DOI: 10.1088/1004-423X/5/1/008
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev  

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

KUANG GUANG-LI (匡光力)a, G.WAIDMANNb
a Institute of Plasma Physic, Academia Sinica, Hefei 230031, China; b Institut für Plasmaphysik/KFA, Postfach 1913, D-5170 Jülich 1, Germany
Abstract  The behavior of magnetohydrodynamic phenomena associated with disruptions of ohmically heated density limit discharges (qa=3.9) in the TEXTOR tokamak has been investigated in detail. A minor disruption is demonstrated 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 oscillations cease, the internal m = 1 kink mode instability is drastically enhanced at once, twisting the plasma core considerably. If the twisting 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.
Received:  04 November 1994      Accepted manuscript online: 
PACS:  52.55.Fa (Tokamaks, spherical tokamaks)  
  52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics))  
  52.50.Nr (Plasma heating by DC fields; ohmic heating, arcs)  
  52.35.Vd (Magnetic reconnection)  
  52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))  
  28.52.Av (Theory, design, and computerized simulation)  

Cite this article: 

KUANG GUANG-LI (匡光力), G.WAIDMANN THE DECISIVE ROLE OF m= 1 AND 2 PERTURBATIONS IN DENSITY LIMIT DISRUPTIONS ON TEXTOR 1996 Acta Physica Sinica (Overseas Edition) 5 58

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