中国物理B ›› 1996, Vol. 5 ›› Issue (1): 58-70.doi: 10.1088/1004-423X/5/1/008

• • 上一篇    

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

G.WAIDMANN1, 匡光力2   

  1. (1)Institut für Plasmaphysik/KFA, Postfach 1913, D-5170 Jülich 1, Germany; (2)Institute of Plasma Physic, Academia Sinica, Hefei 230031, China
  • 收稿日期:1994-11-04 出版日期:1996-01-20 发布日期:1996-01-20

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

KUANG GUANG-LI (匡光力)a, G.WAIDMANNb   

  1. a Institute of Plasma Physic, Academia Sinica, Hefei 230031, China; b Institut für Plasmaphysik/KFA, Postfach 1913, D-5170 Jülich 1, Germany
  • Received:1994-11-04 Online:1996-01-20 Published:1996-01-20

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摘要： 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 tn = 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.

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.

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
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)