Turbulent dynamics of helical perturbations in the edge plasma of the T-10 tokamak

Journal Article · Wed Apr 15 04:00:00 EDT 2009 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X09040011· OSTI ID:21405944

Shurygin, R V; Mel'nikov, A V ^[1]

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1. Russian Research Centre Kurchatov Institute (Russian Federation)

Turbulent dynamics of the edge plasma in the T-10 tokamak is simulated numerically by solving nonlinear MHD equations in the framework of the four-field {l_brace}{phi}, n, p{sub e}, p{sub i{r_brace}} reduced two-fluid Braginskii hydro-dynamics. It is shown that the transition from ohmic to electron-cyclotron heating is accompanied by a decrease in the amplitudes of turbulent fluctuations in plasma. This is caused by the enhancement of longitudinal dissipation due to the increase in the electron temperature. However, phase relations between potential fluctuations of different modes change in such a way that the Reynolds turbulent force increases, which leads to an increase in the poloidal velocity in the direction of ion diamagnetic drift. Since the poloidal and ion diamagnetic drift velocities enter into the equation of the radial force balance for ions with different signs, the radial electric field decreases. The simulation results agree qualitatively with the results of experiments in the T-10 tokamak. The dependence of the radial electric field on the plasma density, ion pressure, and neutral density is also calculated.

• OSTI ID: 21405944
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 4 Vol. 35; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARGED PARTICLES
CLOSED PLASMA DEVICES
COMPUTERIZED SIMULATION
DISTURBANCES
ECR HEATING
ELECTRIC FIELDS
ELECTRON TEMPERATURE
FLUCTUATIONS
FLUID MECHANICS
HEATING
HIGH-FREQUENCY HEATING
HYDRODYNAMICS
IONS
MAGNETOHYDRODYNAMICS
MECHANICS
NONLINEAR PROBLEMS
PLASMA
PLASMA DENSITY
PLASMA HEATING
SIMULATION
T-10 TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS