scholarly journals Interaction of a magnetic island chain in a tokamak plasma with a resonant magnetic perturbation of rapidly oscillating phase

2017 ◽  
Vol 24 (12) ◽  
pp. 122506
Author(s):  
Richard Fitzpatrick
Keyword(s):  
Tokamak Plasma ◽  
Magnetic Island ◽  
Magnetic Perturbation

A brief review: effects of resonant magnetic perturbation on classical and neoclassical tearing modes in tokamaks

2021 ◽  
Author(s):  
Zhengxiong Wang ◽  
Weikang Tang ◽  
Lai Wei
Keyword(s):  
Mode Locking ◽  
Numerical Results ◽  
Magnetic Island ◽  
Magnetic Perturbation ◽  
Tearing Modes ◽  
Experimental Discovery ◽  
Physical Picture

Abstract This paper reviews the effects of resonant magnetic perturbation (RMP) on classical tearing modes (TMs) and neoclassical tearing modes (NTMs) from the theory, experimental discovery and numerical results with a focus on four major aspects: (i) mode mitigation, where the TM/NTM is totally suppressed or partly mitigated by the use of RMP; (ii) mode penetration, which means a linearly stable TM/NTM triggered by the externally applied RMP; (iii) mode locking, namely an existing rotating magnetic island braked and finally stopped by the RMP; (iv) mode unlocking, as the name suggests, it is the reverse of the mode locking process. The key mechanism and physical picture of above phenomena are revealed and summarized.

Efficient estimation of drift orbit island width for passing ions in a shaped tokamak plasma with a static magnetic perturbation

2020 ◽  
Vol 60 (9) ◽  
pp. 096032
Author(s):  
Kouji Shinohara ◽  
Andreas Bierwage ◽  
Akinobu Matsuyama ◽  
Yasuhiro Suzuki ◽  
Go Matsunaga ◽  
...  
Keyword(s):  
Efficient Estimation ◽  
Tokamak Plasma ◽  
Magnetic Perturbation

scholarly journals Suppressing magnetic island growth by resonant magnetic perturbation

2018 ◽  
Vol 58 (5) ◽  
pp. 054003 ◽  
Author(s):  
Q. Yu ◽  
S. Günter ◽  
K. Lackner
Keyword(s):  
Magnetic Island ◽  
Island Growth ◽  
Magnetic Perturbation

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

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.

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