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Physics of Plasmas : Effects of the parallel electron dynamics and finite ion temperature on the plasma blob propagation in the scrape-off layer

By D. Jovanovic, P. K. Shukla, and F. Pegoraro

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Book Id: WPLBN0002169636
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 11 November 2008

Title: Physics of Plasmas : Effects of the parallel electron dynamics and finite ion temperature on the plasma blob propagation in the scrape-off layer  
Author: D. Jovanovic, P. K. Shukla, and F. Pegoraro
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Plasmas Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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P. K. Shukla, And F. Pegorar, D. J. (n.d.). Physics of Plasmas : Effects of the parallel electron dynamics and finite ion temperature on the plasma blob propagation in the scrape-off layer. Retrieved from http://community.worldlibrary.net/


Description
Description: A new three-dimensional model for the warm-ion turbulence at the tokamak edge plasma and in the scrape-off layer is proposed, and used to study the dynamics of plasma blobs in the scrape-off layer. The model is based on the nonlinear interchange mode, coupled with the nonlinear resistive drift mode, in the presence of the magnetic curvature drive, the density inhomogeneity, the electron dynamics along the open magnetic field lines, and the electron-ion and electron-neutral collisions. Within the present model, the effect of the sheath resistivity decreases with the distance from the wall, resulting in the bending and the break up of the plasma blob structure. Numerical solutions exhibit the coupling of interchange modes with nonlinear drift modes, causing the collapse of the blob in the lateral direction, followed by a clockwise rotation and radial propagation. The symmetry breaking, caused both by the parallel resistivity and the finite ion temperature, introduces a poloidal component in the plasma blob propagation, while the overall stability properties and the speed are not affected qualitatively.

 

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