Finite Larmor radius assisted velocity shear stabilization of the interchange instability in magnetized plasmas

2005 ◽  
Vol 12 (6) ◽  
pp. 064504 ◽  
Author(s):  
Sheung-wah Ng ◽  
A. B. Hassam
Keyword(s):  
Velocity Shear ◽  
Larmor Radius ◽  
Magnetized Plasmas ◽  
Finite Larmor Radius ◽  
Interchange Instability

Interchange instability with line-typing and finite Larmor radius effects

1977 ◽  
Vol 20 (8) ◽  
pp. 1378 ◽  
Author(s):  
John C. Riordan ◽  
Charles W. Hartman
Keyword(s):  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Interchange Instability

Quasi-particles in magnetized plasmas: second-order approximation

1995 ◽  
Vol 53 (2) ◽  
pp. 223-234 ◽  
Author(s):  
Petro P. Sosenko†
Keyword(s):  
Magnetic Fields ◽  
Order Approximation ◽  
Equations Of Motion ◽  
Second Order ◽  
Larmor Radius ◽  
Magnetized Plasmas ◽  
Quasi Particle ◽  
Second Order Approximation ◽  
Finite Larmor Radius ◽  
Particle Properties

A second-order approximation is formulated and studied within the context of the quasi-particle description of magnetized plasmas. The general case of relativistic particles in non-uniform but stationary magnetic fields, and in additional force fields that are strongly non-uniform but slowly evolving in time compared with particle gyrations with the cyclotron frequency, is considered. In order to reveal the physical significance of the second-order approximation, the mean (reduced) particle velocity is calculated up to second order, when polarization particle drift as well as the renormalization of the lower-order result become equally significant. A general expression for the velocity of particle polarization drift is obtained in terms of quasi-particle properties, and with account taken of finite-Larmor-radius effects and non-uniformity of magnetic fields. A guiding-centre transformation is found that makes it possible to achieve equal mean velocities of particle, guiding centre and quasi-particle up to second order. Then polarization drifts enter the particle, guiding-centre and quasi-particle equations of motion.

scholarly journals Hall and finite Larmor radius effects on the dipolarization fronts associated with interchange instability

2015 ◽  
Vol 42 (23) ◽  
Author(s):  
H. Y. Lu ◽  
J. B. Cao ◽  
Y. S. Ge ◽  
T. L. Zhang ◽  
R. Nakamura ◽  
...  
Keyword(s):  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Interchange Instability

Charge-separation velocity shear and suppression of turbulence at a plasma edge in the gyrokinetic approximation

1999 ◽  
Vol 61 (2) ◽  
pp. 191-212 ◽  
Author(s):  
M. SHOUCRI ◽  
G. MANFREDI ◽  
P. BERTRAND ◽  
A. GHIZZO ◽  
J. LEBAS ◽  
...  
Keyword(s):  
Electric Field ◽  
Charge Separation ◽  
Fundamental Mode ◽  
Velocity Shear ◽  
Larmor Radius ◽  
Time Varying ◽  
Plasma Edge ◽  
Finite Larmor Radius ◽  
Separation Velocity ◽  
Turbulent Spectrum

The existence and time evolution of charge separation at a plasma edge is studied using a code in which both ions and electrons are described by gyrokinetic equations that include the finite-Larmor-radius correction and the polarization drift. The ion finite-Larmor-radius effect allows the existence of charge separation between ions and electrons, and the polarization drift, which has opposite signs for ions and electrons, has a tendency to accentuate the charge separation in a time-varying electric field. We compare our results with those previously obtained using a code in which the ions were described by using a fluid guiding-centre model, and only the electrons were treated kinetically. In particular, we present results showing excellent agreement between the two codes on the transition of the spectrum of the nonlinear solution from a turbulent spectrum to one dominated by the fundamental mode, where the energy is condensing in the lowest-k modes (inverse cascade).

scholarly journals Ion finite Larmor radius effects on the interchange instability in an open system

2013 ◽  
Vol 20 (11) ◽  
pp. 112107
Author(s):  
I. Katanuma ◽  
S. Sato ◽  
Y. Okuyama ◽  
S. Kato ◽  
R. Kubota
Keyword(s):  
Open System ◽  
Larmor Radius ◽  
Finite Larmor Radius ◽  
Interchange Instability

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.

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