scholarly journals Sawtooth control using electron cyclotron current drive in the presence of energetic particles in high performance ASDEX Upgrade plasmas

2013 ◽  
Vol 55 (6) ◽  
pp. 065009 ◽  
Author(s):  
I T Chapman ◽  
V Igochine ◽  
M Maraschek ◽  
P J McCarthy ◽  
G Tardini ◽  
...  
Keyword(s):  
High Performance ◽  
Energetic Particles ◽  
Electron Cyclotron ◽  
Current Drive

Modification of the Current Profile in High-Performance Plasmas using Off-Axis Electron-Cyclotron-Current Drive in DIII-D

2003 ◽  
Vol 90 (25) ◽  
Author(s):  
M. Murakami ◽  
M. R. Wade ◽  
C. M. Greenfield ◽  
T. C. Luce ◽  
M. A. Makowski ◽  
...  
Keyword(s):  
High Performance ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Current Profile

Suppression of toroidal Alfvén eigenmodes by the electron cyclotron current drive in KSTAR plasmas

2021 ◽  
Author(s):  
Junghee Kim ◽  
Jisung Kang ◽  
Tongnyeol Rhee ◽  
Jungmin Jo ◽  
Hyunsun Han ◽  
...  
Keyword(s):  
Ion Transport ◽  
High Performance ◽  
Neutron Emission ◽  
Substantial Reduction ◽  
Electron Cyclotron ◽  
Current Drive ◽  
Classical Level ◽  
Central Plasma ◽  
Alfven Eigenmodes ◽  
Fast Ion

Abstract Advanced operation scenarios such as high poloidal beta (βP) or high q min are promising concepts to achieve the steady-state high-performance fusion plasmas. However, those scenarios are prone to substantial Alfvénic activity, causing fast-ion transport and losses. Recent experiments with the advanced operation scenario on KSTAR tokamak have shown that the electron cyclotron current drive (ECCD) is able to mitigate and suppress the beam-ion driven toroidal Alfvén eigenmodes (TAEs) for over several tens of global energy confinement time. Co-current directional intermediate off-axis ECCD lowers the central safety factor slightly and tilts the central q-profile shape so that the continuum damping in the core region increases. Besides, the rise of central plasma pressure and increased thermal-ion Landau damping contribute to TAE stabilization. While the TAEs are suppressed, neutron emission rate and total stored energy increase by approximately 45% and 25%, respectively. Fast-ion transport estimated by TRANSP calculations approaches the classical level during the TAE suppression period. Substantial reduction in fast-ion loss and neutron deficit is also observed. Enhancement of fast-ion confinement by suppressing the TAEs leads to an increase of non-inductive current fraction and will benefit the sustainment of the long-pulse high-performance discharges.

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

scholarly journals Electron cyclotron current drive calculated for ITER conditions using different models

2008 ◽  
Vol 48 (5) ◽  
pp. 054002 ◽  
Author(s):  
N.B. Marushchenko ◽  
H. Maassberg ◽  
Yu. Turkin
Keyword(s):  
Electron Cyclotron ◽  
Current Drive
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