Excitation of the Alfvén eigenmodes by localized energetic ions in optimized stellarators

2008 ◽  
Vol 15 (10) ◽  
pp. 102504 ◽  
Author(s):  
V. S. Marchenko
Keyword(s):  
Energetic Ions ◽  
Alfven Eigenmodes

Thermal ion effects on kinetic beta-induced Alfvén eigenmodes excited by energetic ions

2013 ◽  
Vol 20 (3) ◽  
pp. 032505 ◽  
Author(s):  
Longyu Qi ◽  
J. Q. Dong ◽  
A. Bierwage ◽  
Gaimin Lu ◽  
Z. M. Sheng
Keyword(s):  
Energetic Ions ◽  
Alfven Eigenmodes ◽  
Ion Effects

scholarly journals Effect of the electron redistribution on the nonlinear saturation of Alfvén eigenmodes and the excitation of zonal flows

2020 ◽  
Vol 86 (3) ◽  
Author(s):  
A. Biancalani ◽  
A. Bottino ◽  
P. Lauber ◽  
A. Mishchenko ◽  
F. Vannini
Keyword(s):  
Magnetic Field ◽  
Zonal Flow ◽  
Large Aspect Ratio ◽  
Nonlinear Saturation ◽  
Energetic Ions ◽  
Electron Population ◽  
Zonal Flows ◽  
Particle In Cell ◽  
Alfven Eigenmodes ◽  
Reversed Shear

Numerical simulations of Alfvén modes driven by energetic particles are performed with the gyrokinetic (GK) global particle-in-cell code ORB5. A reversed shear equilibrium magnetic field is adopted. A simplified configuration with circular flux surfaces and large aspect ratio is considered. The nonlinear saturation of beta-induced Alfvén eigenmodes (BAE) is investigated. The roles of the wave–particle nonlinearity of the different species, i.e. thermal ions, electrons and energetic ions are described, in particular for their role in the saturation of the BAE and the generation of zonal flows. The nonlinear redistribution of the electron population is found to be important in increasing the BAE saturation level and the zonal flow amplitude.

scholarly journals Observation of Reversed-Shear Alfvén Eigenmodes Excited by Energetic Ions in a Helical Plasma

2010 ◽  
Vol 105 (14) ◽  
Author(s):  
K. Toi ◽  
F. Watanabe ◽  
T. Tokuzawa ◽  
K. Ida ◽  
S. Morita ◽  
...  
Keyword(s):  
Energetic Ions ◽  
Alfven Eigenmodes ◽  
Reversed Shear

Destabilization of reversed shear Alfvén eigenmodes driven by energetic ions during NBI in HL-2A plasmas withqmin∼ 1

2014 ◽  
Vol 54 (10) ◽  
pp. 104002 ◽  
Author(s):  
W. Chen ◽  
LiMin Yu ◽  
Yi. Liu ◽  
X.T. Ding ◽  
H.S. Xie ◽  
...  
Keyword(s):  
Energetic Ions ◽  
Alfven Eigenmodes ◽  
Reversed Shear

Low-frequency global Alfvén eigenmodes in low-shear tokamaks with trapped energetic ions

2009 ◽  
Vol 16 (9) ◽  
pp. 092502 ◽  
Author(s):  
V. S. Marchenko ◽  
Ya. I. Kolesnichenko ◽  
S. N. Reznik
Keyword(s):  
Low Frequency ◽  
Energetic Ions ◽  
Alfven Eigenmodes ◽  
Low Shear

Confinement degradation and transport of energetic ions due to Alfvén eigenmodes in JT-60U weak shear plasmas

2007 ◽  
Vol 47 (8) ◽  
pp. 849-855 ◽  
Author(s):  
M Ishikawa ◽  
M Takechi ◽  
K Shinohara ◽  
C.Z Cheng ◽  
G Matsunaga ◽  
...  
Keyword(s):  
Energetic Ions ◽  
Alfven Eigenmodes

scholarly journals Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions

2014 ◽  
Vol 21 (6) ◽  
pp. 062120 ◽  
Author(s):  
Ruirui Ma ◽  
Ilija Chavdarovski ◽  
Gaoxiang Ye ◽  
Xin Wang
Keyword(s):  
Dispersion Relation ◽  
Linear Dispersion ◽  
Energetic Ions ◽  
Linear Dispersion Relation ◽  
Alfven Eigenmodes
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