The influence of the ion polarization current on magnetic island stability in a tokamak plasma

2006 ◽  
Vol 13 (12) ◽  
pp. 122507 ◽  
Author(s):  
R. Fitzpatrick ◽  
F. L. Waelbroeck ◽  
F. Militello
Keyword(s):  
Tokamak Plasma ◽  
Polarization Current ◽  
Magnetic Island

Collisionality dependence of the polarization current caused by a rotating magnetic island

2005 ◽  
Vol 12 (7) ◽  
pp. 072501 ◽  
Author(s):  
A. Bergmann ◽  
E. Poli ◽  
A. G. Peeters
Keyword(s):  
Polarization Current ◽  
Magnetic Island

The effect of biased limiter on the magnetic island width in tokamak plasma

2013 ◽  
Vol 80 (1) ◽  
pp. 113-130 ◽  
Author(s):  
M. Ghasemloo ◽  
M. Ghoranneviss ◽  
M. K. Salem
Keyword(s):  
Negative Polarity ◽  
Singular Value ◽  
Tokamak Plasma ◽  
Plasma Stability ◽  
Minimal Effect ◽  
Positive Polarity ◽  
Magnetic Islands ◽  
Magnetic Island ◽  
Wavelet Techniques ◽  
Value Decomposition

AbstractIn this work the effects of Cold Biased Limiter (CBL) and Emissive Biased Limiter (EBL) have been individually investigated, in both positive and negative polarities, on the width and frequency of magnetic islands. The effects were examined using singular value decomposition and wavelet techniques on mirnov coil signals. The results show that the application of EBL with both positive and negative polarities has been more effective on plasma stability compared with CBL. Comparing different polarities of CBL and EBL revealed that the positive polarity was more effective on the width of magnetic islands than negative polarity. The greatest impact occurs during EBL with positive polarity, in which reduction is observed in both width of magnetic islands and emission of Hα radiation. Besides, intensity and frequency of magnetic islands are reduced from 50 to 25 kHz in around 1 ms after bias application. Meanwhile, the minimal effect on width and frequency of magnetic field occurs in CBL with negative polarity.

scholarly journals Drift kinetic theory of neoclassical tearing modes in a low collisionality tokamak plasma: magnetic island threshold physics

2021 ◽  
Author(s):  
Alexandra V Dudkovskaia ◽  
Jack W Connor ◽  
David Dickinson ◽  
Peter Alec Hill ◽  
Koki Imada ◽  
...  
Keyword(s):  
Kinetic Theory ◽  
Tokamak Plasma ◽  
Magnetic Island ◽  
Tearing Modes

The role of polarization current in magnetic island evolution

2001 ◽  
Vol 8 (6) ◽  
pp. 2835-2848 ◽  
Author(s):  
J. W. Connor ◽  
F. L. Waelbroeck ◽  
H. R. Wilson
Keyword(s):  
Polarization Current ◽  
Magnetic Island ◽  
Island Evolution
Sign in / Sign up

Export Citation Format

Share Document