Transport of meso-scale structures in tokamak edge plasmas

Abstract

We review possible mechanisms of blobby transport in fusion-related plasmas. The models dealing with the effective plasma gravity and caused by both ∇ ⊥ Te and parallel shear of E × B drift instabilities are considered. 52.35.Ra, 52.55.Rk PACS

Two-dimensional modelling of blob dynamics in tokamak edge plasmas

“…22,28 However, the HB blob velocity is predicted to be independent of the blob scale. 31,32 Here we confirm it with numerical modelling ͑see Fig. 8͒.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It also becomes evident that the socalled edge localized modes ͑ELMs͒ in the high confinement regime in tokamaks propagate into the SOL region in very much the same way as blobs do. [17][18][19][20][21] A significant amount of theoretical and computational work on blob physics [22][23][24][25][26][27][28][29][30][31][32][33] have been done to date. It turns out that reduced two-dimensional ͑2D͒ blob models with different closures for the current along field lines are rather simple but is still a useful approach to understand the main features of blob dynamics.…”

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

“…39,47,76 The mathematical description of the X-point fanning effect is carried out by means of an X-point BC analogous to one originally used in linear theory. 111,112,254 A generalized BC that includes both types of cross-field currents has also been discussed.…”

Nonlinear interaction of dispersive Alfvén waves and magnetosonic waves in space plasma

“…In order to investigate the nonlinear interaction, the dynamical equations of DAW and the MSW for the low-␤ plasmas and the intermediate-␤ plasmas have been derived. The low-␤ plasmas are applicable to solar corona, 28 laboratory plasmas especially in edge region of tokamak devices, 29,30 and intermediate-␤ plasmas to magnetopause, 31 cusp regions 32 in Earth's magnetosphere. The model equations in the present paper may be considered as some generalization of the Zakharov equations called here a͒ Author to whom correspondence should be addressed.…”