On the fast waves in a cylindrical current-carrying plasma

2021 ◽  
Vol 28 (4) ◽  
pp. 042106
Author(s):  
N. I. Grishanov ◽  
N. A. Azarenkov
Keyword(s):  
Fast Waves

Getting Rid of Fast Waves: Slow Dynamics

2018 ◽  
Author(s):  
Vladimir Zeitlin
Keyword(s):  
Rossby Waves ◽  
Baroclinic Instability ◽  
Nonlinear Effects ◽  
Kelvin Wave ◽  
Beta Plane ◽  
Equatorial Wave ◽  
Flow Over Topography ◽  
Wave Guides ◽  
Rotating Shallow Water ◽  
Fast Waves

After analysis of general properties of horizontal motion in primitive equations and introduction of principal parameters, the key notion of geostrophic equilibrium is introduced. Quasi-geostrophic reductions of one- and two-layer rotating shallow-water models are obtained by a direct filtering of fast inertia–gravity waves through a choice of the time scale of motions of interest, and by asymptotic expansions in Rossby number. Properties of quasi-geostrophic models are established. It is shown that in the beta-plane approximations the models describe Rossby waves. The first idea of the classical baroclinic instability is given, and its relation to Rossby waves is explained. Modifications of quasi-geostrophic dynamics in the presence of coastal, topographic, and equatorial wave-guides are analysed. Emission of mountain Rossby waves by a flow over topography is demonstrated. The phenomena of Kelvin wave breaking, and of soliton formation by long equatorial and topographic Rossby waves due to nonlinear effects are explained.

Energy Transport in Tokamak Plasmas with Central Current Density Control Using Fast Waves

1996 ◽  
Vol 77 (15) ◽  
pp. 3141-3144 ◽  
Author(s):  
C. B. Forest ◽  
C. C. Petty ◽  
M. E. Austin ◽  
F. W. Baity ◽  
K. H. Burrell ◽  
...  
Keyword(s):  
Current Density ◽  
Energy Transport ◽  
Tokamak Plasmas ◽  
Density Control ◽  
Fast Waves

Scattering damping of LH fast waves by density fluctuations in CCT

1989 ◽  
Author(s):  
K. F. Lai ◽  
B. D. Fried ◽  
R. J. Taylor
Keyword(s):  
Density Fluctuations ◽  
Fast Waves

scholarly journals Excitation of fast waves by slow waves near the lower-hybrid frequency

1976 ◽  
Vol 19 (9) ◽  
pp. 1392 ◽  
Author(s):  
R. L. Berger ◽  
Liu Chen
Keyword(s):  
Slow Waves ◽  
Lower Hybrid ◽  
Hybrid Frequency ◽  
Fast Waves

scholarly journals Profiles of fast ions that are accelerated by high harmonic fast waves in the National Spherical Torus Experiment

2010 ◽  
Vol 52 (2) ◽  
pp. 025006 ◽  
Author(s):  
D Liu ◽  
W W Heidbrink ◽  
M Podestà ◽  
R E Bell ◽  
E D Fredrickson ◽  
...  
Keyword(s):  
High Harmonic ◽  
Spherical Torus ◽  
Fast Ions ◽  
Fast Waves

Plasma-turbulence suppression and transport-barrier formation by externally driven radiofrequency waves in spherical tokamaks

2001 ◽  
Vol 65 (3) ◽  
pp. 235-253 ◽  
Author(s):  
K. KOMOSHVILI ◽  
S. CUPERMAN ◽  
C. BRUMA
Keyword(s):  
Electric Fields ◽  
Turbulent Transport ◽  
Plasma Turbulence ◽  
Ion Temperature ◽  
Transport Barrier ◽  
Ion Temperature Gradient ◽  
Turbulence Suppression ◽  
Barrier Formation ◽  
Transport Barriers ◽  
Fast Waves

Turbulent transport of heat and particles is the principle obstacle confronting controlled fusion today. We investigate quantitatively the suppression of turbulence and formation of transport barriers in spherical tokamaks by sheared electric fields generated by externally driven radiofrequency (RF) waves, in the frequency range ωA ∼ ω < ωci (where ωA and ωci are the Alfvén and ion cyclotron frequencies).This investigation consists of the solution of the full-wave equation for a spherical tokamak in the presence of externally driven fast waves and the evaluation of the power dissipation by the mode-converted Alfvén waves. This in turn provides a radial flow shear responsible for the suppression of plasma turbulence. Thus a strongly nonlinear equation for the radial sheared electric field is solved, and the turbulent transport suppression rate is evaluated and compared with the ion temperature gradient (ITG) instability increment.

Sign in / Sign up

Export Citation Format

Share Document