Reversed-field pinch dynamics and transport studies. Quarterly progress report, third quarter, 20 October 1983-20 January 1984
Progress in RFP dynamics and transport studies is described. A three-dimensional, incompressible MHD code has been developed, and is being checked against known results. It is computationally more efficient than the existing code, and will be used extensively if compressibility 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. These results have been documented in a publication. Statistical analysis of stochastic magnetic field regions to assess transport coefficients is underway. Analytic studies of the RFP dynamo are continuing. We are attempting to find steady state solutions with flow to the resistive MHD equations. Necessary conditions for the existance of the dynamo have been identified. A reduced model to simulate phenomena that occur on the relaxation time scale, such as F-theta current drive, has been derived, and a numerical algorithm formulated.
- Research Organization:
- Science Applications, Inc., La Jolla, CA (USA)
- DOE Contract Number:
- AC03-83ER53150
- OSTI ID:
- 5194227
- Report Number(s):
- DOE/ER/53150-T3; ON: DE84009054
- Country of Publication:
- United States
- Language:
- English
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