Abstract
Abstract We have studied the impurity ion transport by a filamentary plasma structure with the three-dimensional electrostatic particle-in-cell simulation. The effective diffusivity of the impurity ions transported by a filamentary plasma structure has been calculated from the simulation result. The sequence of simulations has revealed that the effective diffusivity of impurity ions has a positive correlation with the poloidal size of a filament and a slight inverse correlation with the ion temperature, and that the effective diffusivity becomes quite small in the heavy impurity ion mass case.
Highlights
In recent experiments of magnetic confinement devices, the intermittent filamentary coherent structures called “blob” or “hole” have been observed in the boundary layer plasmas [1,2,3,4,5,6,7,8,9,10,11,12]
The sequence of simulations has revealed that the effective diffusivity of impurity ions has a positive correlation with the poloidal size of a filament and a slight inverse correlation with the ion temperature, and that the effective diffusivity becomes quite small in the heavy impurity ion mass case
With the 3D-PIC simulation, we have demonstrated the self-consistent current system and the temperature structure in a blob [26] and have revealed the kinetic effect on the blob propagation dynamics [27]
Summary
In recent experiments of magnetic confinement devices, the intermittent filamentary coherent structures called “blob” or “hole” have been observed in the boundary layer plasmas [1,2,3,4,5,6,7,8,9,10,11,12]. Such structures are thought to provide the radial non-diffusive transport in the boundary layer plasmas Motivated by such experiments, many theoretical studies and numerical studies regarding the filament dynamics have been conducted on the basis of two-dimensional reduced fluid models [13, 14]. Some numerical works, in which threedimensional fluid simulations were carried out or some kinetic effects are included, have been performed [15,16,17,18,19,20,21,22] The size of such structures on the cross-section is thought to be in meso‐scale in many situations.
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