Journal Article

PreJuSER-45420

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Neoclassical theory of rotation and electric field in high collisionality plasmas with steep gradients

Claaßen, H. A.FZJ* ; Gerhauser, H.FZJ* ; Rogister, A.FZJ* ; Yarim, C.

2000
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/2314

Abstract: The equation describing the radial transport of toroidal momentum in a collisional subsonic plasma with steep gradients has been obtained via a systematic expansion of the two-fluid equations. The diffusion rate is classical; the poloidal rotation, driven by the temperature gradient, generates, in turn, a toroidal flow gradient, also in Ohmic discharges. Moreover, important modifications of the parallel momentum equation are found to arise if Lambda(1)equivalent to(nu(i)/Omega(i))(q(2)R(2)/rL(T)) is greater than or equal to O(1/3); the poloidal rotation velocity is then no longer unique but obeys a cubic equation which may allow for bifurcated equilibria under certain conditions. The toroidal velocities predicted for Ohmic discharges compare well with those measured in PLT [Princeton Large Torus; S. Suckewer , Nucl. Fusion 21, 1301 (1981)]; the relevance of the extended equation providing the poloidal rotation velocity to selected experimental edge plasmas is discussed. (C) 2000 American Institute of Physics. [S1070-664X(00)04009-X].

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institutsbereich I (IPP-1)
2. Institutsbereich II (IPP-2)

Research Program(s):

1. Instabilitäten und transportvorgänge im Plasma (22.76.0)
2. Teilchen- und Energietransport in der Plasmarandschicht (22.88.5)

Appears in the scientific report 2000
Notes: This version is available at the following Publisher URL: http://pop.aip.org

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