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  4. Resistive Toroidal Stability of Internal Kink Modes in Circular and Shaped Tokamaks
 
research article

Resistive Toroidal Stability of Internal Kink Modes in Circular and Shaped Tokamaks

Bondeson, A.
•
Vlad, G.
•
Lutjens, H.
1992
Physics of Fluids B-Plasma Physics

The linear resistive magnetohydrodynamical stability of the n = 1 internal kink mode in tokamaks is studied numerically. The stabilizing influence of small aspect ratio [Holmes et al., Phys. Fluids B 1, 788 (1989)] is confirmed, but it is found that shaping of the cross section influences the internal kink mode significantly. For finite pressure and small resistivity, curvature effects at the q= 1 surface make the stability sensitively dependent on shape, and ellipticity is destabilizing. Only a very restricted set of finite pressure equilibria is completely stable for q0 < 1. A typical result is that the resistive kink mode is slowed down by toroidal effects to a weak resistive tearing/interchange mode. It is suggested that weak resistive instabilities are stabilized during the ramp phase of the sawteeth by effects not included in linear resistive magnetohydrodynamics. Possible mechanisms for triggering a sawtooth crash are discussed.

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Type
research article
DOI
10.1063/1.860041
Author(s)
Bondeson, A.
Vlad, G.
Lutjens, H.
Date Issued

1992

Published in
Physics of Fluids B-Plasma Physics
Volume

4

Issue

7

Start page

1889

End page

1900

Note

Part 1

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Available on Infoscience
April 16, 2008
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/21215
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