scholarly journals Finite Larmor radius effects at the high confinement mode pedestal and the related force-free steady state

2019 ◽  
Vol 26 (4) ◽  
pp. 040701
Author(s):  
W. W. Lee ◽  
R. B. White
Keyword(s):  
Steady State ◽  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Confinement Mode

scholarly journals Ion Confinement in a Toroidal Heliac

1998 ◽  
Vol 51 (1) ◽  
pp. 67
Author(s):  
J. L. V. Lewandowski
Keyword(s):  
Numerical Simulations ◽  
Equations Of Motion ◽  
Three Dimensional ◽  
Larmor Radius ◽  
Collision Term ◽  
Magnetic Topology ◽  
Finite Larmor Radius ◽  
Confinement Mode

A model to describe an unmagnetised plasma in three-dimensional magnetic topology is presented. Ion trajectories are integrated numerically and all finite-Larmor radius effects are retained exactly. A velocity-dependent collision term is included in the equations of motion. Numerical simulations relevant to the low-confinement mode of H1-NF are presented and discussed.

Excitation of Alfvén waves by fast particles in a finite pressure plasma of adiabatic traps

1978 ◽  
Vol 20 (1) ◽  
pp. 137-148 ◽  
Author(s):  
B. I. Meerson ◽  
A. B. Mikhallovskii ◽  
O. A. Pokhotelov
Keyword(s):  
Uniform Magnetic Field ◽  
Alfven Waves ◽  
Larmor Radius ◽  
Alfvén Waves ◽  
Trapped Particles ◽  
Resonance Effects ◽  
Finite Larmor Radius ◽  
Pressure Plasma ◽  
Pressure Stabilization ◽  
Instability Growth

Resonant excitation of Alfvén waves by fast particles in a finite pressure plasma in a non-uniform magnetic field is studied. Plasma compressibility in the wave field is determined both by the curvature of the magnetic lines of force and finite Larmor radius of fast particles. A general expression for the instability growth rate is obtained and analyzed; the applicability of the results obtained in the previous paper has also been studied. The finite pressure stabilization of the trapped particles instability has been found. The bounce-resonance effects are analyzed.

scholarly journals Diffusion at the Earth magnetopause: enhancement by Kelvin-Helmholtz instability

2007 ◽  
Vol 25 (1) ◽  
pp. 271-282 ◽  
Author(s):  
R. Smets ◽  
G. Belmont ◽  
D. Delcourt ◽  
L. Rezeau
Keyword(s):  
Magnetic Field ◽  
Distribution Functions ◽  
Larmor Radius ◽  
Simple Analytical Model ◽  
Helmholtz Instability ◽  
Field Reversal ◽  
Finite Larmor Radius ◽  
The Earth ◽  
Specific Distribution ◽  
The Magnetic Field

Abstract. Using hybrid simulations, we examine how particles can diffuse across the Earth's magnetopause because of finite Larmor radius effects. We focus on tangential discontinuities and consider a reversal of the magnetic field that closely models the magnetopause under southward interplanetary magnetic field. When the Larmor radius is on the order of the field reversal thickness, we show that particles can cross the discontinuity. We also show that with a realistic initial shear flow, a Kelvin-Helmholtz instability develops that increases the efficiency of the crossing process. We investigate the distribution functions of the transmitted ions and demonstrate that they are structured according to a D-shape. It accordingly appears that magnetic reconnection at the magnetopause is not the only process that leads to such specific distribution functions. A simple analytical model that describes the built-up of these functions is proposed.

Finite-Larmor-radius stabilization of the m = 2 instability in the Isar T1-B high-beta stellarator

1977 ◽  
Vol 17 (1) ◽  
pp. 3-11 ◽  
Author(s):  
J. Neuhauser ◽  
M. Kaufmann ◽  
H. Röhr ◽  
G. Schramm
Keyword(s):  
Larmor Radius ◽  
Finite Larmor Radius ◽  
High Beta

Finite Larmor-Radius Theory of Magnetic Island Evolution

2001 ◽  
Vol 87 (21) ◽  
Author(s):  
F. L. Waelbroeck ◽  
J. W. Connor ◽  
H. R. Wilson
Keyword(s):  
Larmor Radius ◽  
Magnetic Island ◽  
Finite Larmor Radius ◽  
Island Evolution

Finite Larmor Radius and Compressibility Effects on Thermosolutal Instability of a Plasma

1986 ◽  
Vol 41 (5) ◽  
pp. 724-728
Author(s):  
R. C. Sharma ◽  
Neela Rani
Keyword(s):  
Necessary Conditions ◽  
Larmor Radius ◽  
Stationary Convection ◽  
Finite Larmor Radius ◽  
Compressible Plasma ◽  
Compressibility Effects ◽  
Solute Gradient

The thermosolutal instability of a compressible plasma due to the effects of the ion Larmor radius is considered. The system is found to be stable for (Cp/ g ) ß < 1. The finite Larm or radius and the compressibility introduce oscillatory modes in the system for (Cp /g) ß > 1. The compressibility, solute gradient and finite Larmor radius stabilize the stationary convection. The necessary conditions for overstability are also derived.

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