Resistive magnetohydrodynamic transport model for a reversed field pinch. II. Results

摘要

The second paper of this series presents a wide range of results and comparisons obtained by numerically solving the resistive magnetohydrodynamic marginal stability model described in paper I [Phys. Plasmas 10, 2330 (2003), preceding paper]. The topics covered include the following. Many simulations have been carried out from which it has been possible to perform a regression analysis leading to macroscopic scaling relations for tau(E) and beta(p) as functions of I, a, n, and the pinch parameter theta. The scaling relations are used to compare with data from the Madison Symmetric Torus (MST) [R.N. Dexter et al., Fusion Technol. 19, 131 (1991)] and the Reversed Field Experiment (RFX) [G. Rostagni, Fusion Eng. Des. 25, 301 (1995)], various near-analytic theoretical models, numerical simulations, and an empirical observation first pointed out by Werley concerning the "best" performance of reversed field pinch's (RFP). The present model, which represents the most comprehensive scaling relations to date, agrees reasonably well with both the limited experimental data available and full three-dimensional nonlinear simulations. It makes more accurate predictions than any of the simpler near-analytic models. Finally, a comparison is made between the projected values for nTtau in an RFP and a tokamak. The scaling is surprisingly similar although the numerical coefficient is about a factor of 30 higher (i.e., more favorable) for the tokamak. (C) 2003 American Institute of Physics. [References: 14]