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Plasma fusion torus as a complex space charge structure

D. G. DIMITRIU1,*

Affiliation

  1. Department of Plasma Physics, “Al. I. Cuza” University of Iasi, Romania

Abstract

By increasing the heating power inserted into fusion plasma, first a degradation of energy and particle confinement is obtained (L-mode). Above a certain threshold value of this power, a regime of improved energy and particle confinement (H-mode) is attained. The H-mode is characterized by sharp gradients of the density and the temperature in the plasma edge region, indicating the formation of a transport barrier. This barrier leads to a reduction of the radial transport and a suppression of fluctuations. A localized radial electric field develops in the edge plasma region at the L-H transition. In this work we would like to emphasize a certain striking similarity between the L-H transition in fusion plasma and the appearance of a complex structure in low-temperature plasmas. Under some experimental conditions, a complex space charge structure can appear in form of an ion-rich plasma region confined by a plasma double layer. This structure is also characterized by steep gradients of density and temperature at the edge. A we l-localized radial electric field develops in the edge region due to the double layer, which works as a radial transport engine. After the CSCC appearance, the fluctuation level decreases..

Keywords

L-H transition, Double layer, Edge transport barrier, Bistability.

Submitted at: Oct. 14, 2005
Accepted at: Jan. 26, 2006

Citation

D. G. DIMITRIU, Plasma fusion torus as a complex space charge structure, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 128-131 (2006)