Tokamak turbulence in self-regulated differentially rotating flow and L-H transition dynamics
Conference
·
OSTI ID:6970930
- Wisconsin Univ., Madison, WI (United States). Dept. of Physics
- California Univ., San Diego, La Jolla, CA (United States). Dept. of Physics General Atomics, San Diego, CA (United States)
- Oak Ridge National Lab., TN (United States)
An analytical study of turbulence in the presence of turbulently generated differentially rotating flow is presented as a paradigm for fluctuation dynamics in L- and H-mode plasmas. Using a drift wave model, the role of both flow shear and flow curvature (second radial derivative of the poloidal ExB flow) is detailed in linear and saturated turbulence phases. In the strong turbulence saturated state, finite amplitude-induced modification of the fluctuation structure near low order rational surfaces strongly inhibits flow shear suppression. Suppression by curvature is not diminished, but it occurs through a frequency shift. A description of L-H mode transition dynamics based on the self-consistent linking of turbulence suppression by differentially rotating flow and generation of flow by turbulent momentum transport is presented. In this model, rising edge temperature triggers a transition characterized by spontaneous generation of differentially rotating flow and decreasing turbulence intensity.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400; FG02-89ER53291
- OSTI ID:
- 6970930
- Report Number(s):
- CONF-920142-2; ON: DE93000443
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700370 -- Plasma Fluid & MHD Properties-- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
FLUCTUATIONS
FLUID FLOW
H-MODE PLASMA CONFINEMENT
NONLINEAR PROBLEMS
PLASMA
PLASMA CONFINEMENT
ROTATING PLASMA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENT FLOW
VARIATIONS
700310 -- Plasma Confinement-- (1992-)
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700370 -- Plasma Fluid & MHD Properties-- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
FLUCTUATIONS
FLUID FLOW
H-MODE PLASMA CONFINEMENT
NONLINEAR PROBLEMS
PLASMA
PLASMA CONFINEMENT
ROTATING PLASMA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENT FLOW
VARIATIONS