Moment approach to neoclassical flows, currents and transport in auxiliary heated tokamaks
The moment approach is utilized to derive the full complement of neoclassical transport processes in auxiliary heated tokamaks. The effects of auxiliary heating (neutral beam injection (NBI) and ion cyclotron resonance heating (ICRH)) considered arise from the collisional interaction between the background plasma species and the fast-ion-tail species. From a known fast ion distribution function we evaluate the parallel (to the magnetic field) momentum and heat flow inputs to the background plasma. Then, through the momentum and heat flow balance equations, we can determine the induced parallel flows (and current) and radial transpot fluxes in ''equilibrium'' (on the time scale much longer than the collisional relaxation time, i.e., t >> 1..nu../sub ii/). In addition to the fast-ion-induced current, the total neoclassical current includes the boostap current, which is driven by the pressure and temperature gradients, the Pfirsch-Schlueter current which is required for charge neutrality, and the neoclassical (including trapped particle effects) Spitzer current due to the parallel electric field. The radial transport fluxes also include off-diagonal compnents in the transport matrix which correspond to the Ware (neoclassical) pinch due to the inductive applied electric field an the fast-ion-induced radial fluxes, in addition to the usual pressure- and temperature-gradient-driven fluxes (particle diffusion and heat conduction). Once the tranport coefficient are completely determined, the radial fluxes and the heat fluxes can be substituted into the density and energy evolution equations to provide a complete description of ''equilibrium'' (deltadeltat << ..nu../sub ii/) neoclassical transport processes in a plasma. 47 refs., 14 figs
- Research Organization:
- Wisconsin Univ., Madison (USA). Dept. of Physics
- DOE Contract Number:
- FG02-86ER53218
- OSTI ID:
- 5153697
- Report Number(s):
- UWPR-88-2; ON: DE88008024
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TOKAMAK DEVICES
NEOCLASSICAL TRANSPORT THEORY
BANANA REGIME
BEAM INJECTION HEATING
DISTRIBUTION FUNCTIONS
ENTROPY
FOKKER-PLANCK EQUATION
HEAT FLOW
ICR HEATING
MHD EQUILIBRIUM
PRESSURE GRADIENTS
STRESS ANALYSIS
TEMPERATURE GRADIENTS
VISCOUS FLOW
CLOSED PLASMA DEVICES
DIFFERENTIAL EQUATIONS
EQUATIONS
EQUILIBRIUM
FLUID FLOW
FUNCTIONS
HEATING
HIGH-FREQUENCY HEATING
PARTIAL DIFFERENTIAL EQUATIONS
PHYSICAL PROPERTIES
PLASMA HEATING
THERMODYNAMIC PROPERTIES
THERMONUCLEAR DEVICES
TRANSPORT THEORY
TRAPPING
700103* - Fusion Energy- Plasma Research- Kinetics