NIMROD: A computational laboratory for studying nonlinear fusion magnetohydrodynamics
| Autor: | Carl Sovinec, T. A. Gianakon, Nimrod Team, Dalton D. Schnack, Eric Held, Scott Kruger |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 10:1727-1732 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Nonlinear numerical studies of macroscopic modes in a variety of magnetic fusion experiments are made possible by the flexible high-order accurate spatial representation and semi-implicit time advance in the NIMROD simulation code [A. H. Glasser et al., Plasma Phys. Controlled Fusion 41, A747 (1999)]. Simulation of a resistive magnetohydrodynamics mode in a shaped toroidal tokamak equilibrium demonstrates computation with disparate time scales, simulations of discharge 87009 in the DIII-D tokamak [J. L. Luxon et al., Plasma Physics and Controlled Nuclear Fusion Research 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p. 159] confirm an analytic scaling for the temporal evolution of an ideal mode subject to plasma-β increasing beyond marginality, and a spherical torus simulation demonstrates nonlinear free-boundary capabilities. A comparison of numerical results on magnetic relaxation finds the n=1 mode and flux amplification in spheromaks to be very closely related to the m=1 dynamo modes and magnetic reversal in reversed-field pinch configurations. Advances in local and nonlocal closure relations developed for modeling kinetic effects in fluid simulation are also described. |
| Databáze: | OpenAIRE |
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