scholarly journals Oblique electron-cyclotron-emission radial and phase detector of rotating magnetic islands applied to alignment and modulation of electron-cyclotron-current-drive for neoclassical tearing mode stabilization

2012 ◽  
Vol 83 (10) ◽  
pp. 103507 ◽  
Author(s):  
F. Volpe ◽  
M. E. Austin ◽  
G. Campbell ◽  
T. Deterly
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Phase Detector ◽  
Electron Cyclotron Emission ◽  
Magnetic Islands ◽  
Tearing Mode ◽  
Cyclotron Emission ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

Requirements for alignment of electron cyclotron current drive for neoclassical tearing mode stabilization in ITER

2008 ◽  
Vol 48 (5) ◽  
pp. 054004 ◽  
Author(s):  
R.J. La Haye ◽  
J.R. Ferron ◽  
D.A. Humphreys ◽  
T.C. Luce ◽  
C.C. Petty ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

scholarly journals Numerical Analysis of Neoclassical Tearing Mode Stabilization by Electron Cyclotron Current Drive

2004 ◽  
Vol 80 (7) ◽  
pp. 605-613 ◽  
Author(s):  
Nobuhiko HAYASHI ◽  
Akihiko ISAYAMA ◽  
Kazunobu NAGASAKI ◽  
Takahisa OZEKI
Keyword(s):  
Numerical Analysis ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

Cross–machine benchmarking for ITER of neoclassical tearing mode stabilization by electron cyclotron current drive

2006 ◽  
Vol 46 (4) ◽  
pp. 451-461 ◽  
Author(s):  
R.J. La Haye ◽  
R Prater ◽  
R.J Buttery ◽  
N Hayashi ◽  
A Isayama ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

scholarly journals Modelling effects of edge density fluctuations on electron-cyclotron current drive used for neoclassical tearing mode stabilization

2021 ◽  
Vol 87 (1) ◽  
Author(s):  
C. Tsironis ◽  
P. Papagiannis ◽  
F. Bairaktaris ◽  
S. I. Valvis ◽  
K. Hizanidis
Keyword(s):  
Density Fluctuations ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Edge Density ◽  
Tearing Mode ◽  
Electron Density Fluctuations ◽  
Propagation Methods ◽  
Homogenization Methods ◽  
Neoclassical Tearing Mode ◽  
Mode Stabilization

In this work we study the undesired effects of electron density fluctuations (in the form of blob structures which may exist in the edge region of tokamak plasmas) to the electron-cyclotron wave propagation and current drive in connection to the efficiency of neoclassical tearing mode stabilization. Our model involves the evaluation of the driven current in the presence of density perturbations, by using a combination of a wave solver based on the transfer matrix and electromagnetic homogenization methods for the propagation part prior to and inside the region of these structures (where standard asymptotic propagation methods may not be valid due to the short-wavelength limit breakdown), with a ray tracing code including island geometry effects and current drive computation for the propagation past the perturbed region. The computed driven current is input into the modified Rutherford equation in order to estimate the consequences of the wave deformation (driven by the density fluctuations) to the mode stabilization.

scholarly journals Suppression of neoclassical tearing mode instability at the initial stage by electron cyclotron current drive

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035212
Author(s):  
Zhen Yang ◽  
Bin Wu ◽  
Yuanlai Xie ◽  
Yuqing Chen ◽  
Hongming Zhang ◽  
...  
Keyword(s):  
Electron Cyclotron ◽  
Current Drive ◽  
Tearing Mode ◽  
Mode Instability ◽  
Initial Stage ◽  
Neoclassical Tearing Mode

Magnetic island suppression by electron cyclotron current drive as converse of a forced reconnection problem

2018 ◽  
Vol 84 (3) ◽  
Author(s):  
D. Grasso ◽  
D. Borgogno ◽  
L. Comisso ◽  
E. Lazzaro
Keyword(s):  
Robust Control ◽  
Control Strategy ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Magnetic Islands ◽  
Tearing Mode ◽  
Magnetic Island ◽  
Technical Approach ◽  
Physical Conditions ◽  
Secondary Instabilities

This paper addresses one aspect of the problem of the suppression of tearing mode magnetic islands by electron cyclotron current drive (ECCD) injection, formulating the problem as the converse of a forced reconnection problem. New physical conditions are discussed which should be considered in the technical approach towards a robust control strategy. Limits on the ECCD deposition are determined to avoid driving the system into regimes where secondary instabilities develop. Numerical simulations confirming the theory are also presented.

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