scholarly journals Combined ideal and kinetic effects on reversed shear Alfvén eigenmodes

2011 ◽  
Vol 18 (10) ◽  
pp. 102503 ◽  
Author(s):  
N. N. Gorelenkov ◽  
G. J. Kramer ◽  
R. Nazikian
Keyword(s):  
Alfven Eigenmodes ◽  
Kinetic Effects ◽  
Reversed Shear

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 Convective beam ion losses due to Alfvén eigenmodes in DIII-D reversed-shear plasmas

2011 ◽  
Vol 53 (6) ◽  
pp. 062001 ◽  
Author(s):  
D C Pace ◽  
R K Fisher ◽  
M García-Muñoz ◽  
W W Heidbrink ◽  
M A Van Zeeland
Keyword(s):  
Alfven Eigenmodes ◽  
Reversed Shear

scholarly journals Observation of Reversed Shear Alfvén Eigenmodes between Sawtooth Crashes in the Alcator C-Mod Tokamak

2009 ◽  
Vol 102 (16) ◽  
Author(s):  
E. M. Edlund ◽  
M. Porkolab ◽  
G. J. Kramer ◽  
L. Lin ◽  
Y. Lin ◽  
...  
Keyword(s):  
Alfven Eigenmodes ◽  
Sawtooth Crashes ◽  
Reversed Shear

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

scholarly journals Experimental study of reversed shear Alfvén eigenmodes during the current ramp in the Alcator C-Mod tokamak

2010 ◽  
Vol 52 (11) ◽  
pp. 115003 ◽  
Author(s):  
E M Edlund ◽  
M Porkolab ◽  
G J Kramer ◽  
L Lin ◽  
Y Lin ◽  
...  
Keyword(s):  
Experimental Study ◽  
Current Ramp ◽  
Alfven Eigenmodes ◽  
Reversed Shear
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