Vortices associated with toroidal ion temperature gradient driven fluctuations

Technical Report · Fri May 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/5199866· OSTI ID:5199866

Horton, W ^[1]; Jovanovic, D ^[2]; Rasmussen, J J ^[3]

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1. Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
2. Belgrade Univ. (Yugoslavia). Inst. za Fiziku
3. Association Euratom-Risoe National Lab., Roskilde (Denmark)

The three nonlinear hydrodynamic equations for potential, parallel ion velocity and ion pressure used in simulations of the toroidal ion temperature gradient driven fluctuations and transport in a shear magnetic field are analyzed for coherent vortex structures. Two types of vortex structures are found: one type for weak shear that is a generalization of the usual modon vortex construction and the second type of solution for strong magnetic shear where the convective nonlinearity in the parallel velocity field generates a cubic trapping nonlinearity in the vorticity equation. These vortex structures show the possibility of explaining the saturated states observed in the numerical simulations as self-organized nonlinear states in contrast to wave turbulence.

• Research Organization: Texas Univ., Austin, TX (United States). Inst. for Fusion Studies
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG05-80ET53088
• OSTI ID: 5199866
• Report Number(s): DOE/ET/53088-549; IFSR--549; ON: DE92016180
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
ANNULAR SPACE
CLOSED CONFIGURATIONS
COLLISIONLESS PLASMA
COMPUTERIZED SIMULATION
CONFIGURATION
FLUCTUATIONS
FLUID FLOW
ION TEMPERATURE
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC SURFACES
PLASMA
SHEAR
SIMULATION
SPACE
TEMPERATURE GRADIENTS
TOROIDAL CONFIGURATION
TURBULENT FLOW
VARIATIONS
VORTICES