Calculation of poloidal velocity in the tokamak plasma with allowance for density inhomogeneity and diamagnetic drift of ions

Journal Article · Wed Feb 15 04:00:00 EST 2012 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X12020092· OSTI ID:22047433

Shurygin, R V ^[1]

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1. National Research Centre Kurchatov Institute, Institute of Tokamak Physics (Russian Federation)

A one-dimensional evolution equation for the angle-averaged poloidal momentum of the tokamak plasma is derived in the framework of reduced magnetohydrodynamics with allowance for density inhomogeneity and diamagnetic drift of ions. In addition to fluctuations of the E Multiplication-Sign B drift velocity, the resulting turbulent Reynolds stress tensor includes fluctuations of the ion density and ion pressure, as well as turbulent radial fluxes of particles and heat. It is demonstrated numerically by using a particular example that the poloidal velocity calculated using the refined one-dimensional evolution equation differs substantially from that provided by the simplified model. When passing to the new model, both the turbulent Reynolds force and the Stringer-Winsor force increase, which leads to an increase in the amplitude of the ion poloidal velocity. This, in turn, leads to a decrease in turbulent fluxes of particles and heat due to the effect of shear decorrelation.

• OSTI ID: 22047433
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 2 Vol. 38; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
FLUCTUATIONS
ION DENSITY
IONS
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA DENSITY
PLASMA DIAMAGNETISM
PLASMA DRIFT
REYNOLDS NUMBER
SHEAR
STRESSES
TOKAMAK DEVICES
VELOCITY