Abstract
This study has demonstrated kinetic behaviors on the plasma filament propagation with the three-dimensional (3D) Particle-in-Cell (PIC) simulation. When the ion-to-electron temperature ratio T i / T e is higher, the poloidal symmetry breaking in the filament propagation occurs. The poloidal symmetry breaking is thought to be induced by the unbalanced potential structure that arises from the effect of the gyro motion of plasma particles.
Highlights
In recent magnetic plasma confinement experiments, the radial density profile of boundary layer plasmas has been observed to be flatter than the exponential profile expected by the diffusive radial transport [1]
Ti /Te = 0.01, the propagation in the radial (− x) direction is observed to be symmetric in the poloidal (y) direction, which is in agreement with the previous results based on the fluid model [23]
The poloidal symmetry breaking induces the poloidal motion of the blob as seen from Figure 2, which shows the time variations of the poloidal component of the position of the electron center of mass in a blob, ynec
Summary
In recent magnetic plasma confinement experiments, the radial density profile of boundary layer plasmas has been observed to be flatter than the exponential profile expected by the diffusive radial transport [1]. Since there is the possibility that such a non-diffusive radial transport damages the vessel wall of a magnetic confinement device, many authors have theoretically and numerically investigated dynamics of the blob propagation on the basis of two-dimensional reduced fluid models [14,15]. These previous works revealed that the size of a blob, δb , is on the order of ρsi , where ρsi is defined by ρsi = csi /Ωi , csi is the ion acoustic speed given by ( Te /mi )1/2 , Ωi is the ion cyclotron frequency, Te is the electron temperature, and mi is the ion mass.
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