Reversed field pinch dynamics and transport studies. Quarterly progress report, 20 July 1983-20 October 1983
Progress in RFP dynamics and transport studies is described. The compressible, three-dimensional code SPECTR3 has been modified to include toroidal effects, and classical resistivity and thermal conductivity. Anomalous transport arising from stochastic magnetic fields has been included in the model. These transport effects are treated implicitly. A three-dimensional, incompressible MHD code has been developed. It is computationally more efficient than the existing code, and will be used extensively if compessibility is determined to be unimportant. Post-processor codes to analyze data generated by the nonlinear code have been developed. Three-dimensional computer runs at low THETA (= B/sub theta/(a)/) have found the development of a substantial stochastic core, with good flux surfaces being retained in the outer part of the discharge. Runs at high THETA have shown complete stochasticity, with reappearance of outer flux surfaces as the modes saturate and relax. Anomalous maintenance of positive toroidal flux arising from a poloidal electric field at the field reversal surface induced by MHD fluctuations (dynamo) has been observed. We are collaborating with the ETA-BETA-II experimental group at Padua, Italy, in an attempt to interpret measured internal fluctuations and profiles in terms of resistive MHD. The emphasis of this work is on the effect of MHD fluctuations plasma transport. Analytic studies of the RFP dynamo have begun. We are attempting to find steady state solutions with flow to the resistive MHD equations. A reduced model to simulate phenomena that occur on the relaxation time scale, such as F-THETA current drive, has been formulated.
- Research Organization:
- Science Applications, Inc., La Jolla, CA (USA)
- DOE Contract Number:
- AC03-83ER53150
- OSTI ID:
- 5592167
- Report Number(s):
- DOE/ER/53150-T2; ON: DE84002124
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
REVERSE-FIELD PINCH
MAGNETOHYDRODYNAMICS
TRANSPORT THEORY
COMPUTER CALCULATIONS
ELECTRIC CONDUCTIVITY
MAGNETIC FLUX
PLASMA DRIFT
STOCHASTIC PROCESSES
THERMAL CONDUCTIVITY
THREE-DIMENSIONAL CALCULATIONS
TOROIDAL CONFIGURATION
ANNULAR SPACE
CONFIGURATION
ELECTRICAL PROPERTIES
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
PHYSICAL PROPERTIES
PINCH EFFECT
SPACE
THERMODYNAMIC PROPERTIES
700105* - Fusion Energy- Plasma Research- Plasma Kinetics-Theoretical- (-1987)