Zobrazeno 1 - 10
of 199
pro vyhledávání: '"Dewar, R. L."'
We show that the variational energy principle of multi-region relaxed magnetohydrodynamic (MRxMHD) model can be used to predict finite-pressure linear tearing instabilities. In this model, the plasma volume is sliced into sub-volumes separated by "id
Externí odkaz:
http://arxiv.org/abs/2209.05003
The Stepped Pressure Equilibrium Code (SPEC) [Hudson et al., Phys. Plasmas 19, 112502 (2012)] has been successful in the construction of equilibria in 3D configurations that contain a mixture of flux surfaces, islands and chaotic magnetic field lines
Externí odkaz:
http://arxiv.org/abs/2108.02056
Autor:
Dewar, R. L., Qu, Z. S.
Publikováno v:
J. Plasma Phys. 88, 835880101-1--37 (2022)
The gap between a recently developed dynamical version of relaxed magnetohydrodynamics (RxMHD) and ideal MHD (IMHD) is bridged by approximating the zero-resistivity "Ideal" Ohm's Law (IOL) constraint using an augmented Lagrangian method borrowed from
Externí odkaz:
http://arxiv.org/abs/2106.12348
Publikováno v:
Physics of Plasmas 27, 062504 (2020)
A new formulation of time-dependent Relaxed Magnetohydrodynamics (RxMHD) is derived variationally from Hamilton's Action Principle using microscopic conservation of mass, and macroscopic conservation of total magnetic helicity, cross helicity and ent
Externí odkaz:
http://arxiv.org/abs/2002.04892
The Multi-region Relaxed MHD (MRxMHD) has been successful in the construction of equilibria in three-dimensional (3D) configurations. In MRxMHD, the plasma is sliced into sub-volumes separated by ideal interfaces, each undergoing relaxation, allowing
Externí odkaz:
http://arxiv.org/abs/2001.06984
Publikováno v:
Phys. Plasmas 21, 042501 (2014)
We present an extension of the multi-region relaxed magnetohydrodynamics (MRxMHD) equilibrium model that includes plasma flow. This new model is a generalization of Woltjer's model of relaxed magnetohydrodynamics equilibria with flow. We prove that a
Externí odkaz:
http://arxiv.org/abs/1401.3076
The Hahm--Kulsrud (HK) [T. S. Hahm and R. M. Kulsrud, Phys. Fluids {\bf 28}, 2412 (1985)] solutions for a magnetically sheared plasma slab driven by a resonant periodic boundary perturbation illustrate fully shielded (current sheet) and fully reconne
Externí odkaz:
http://arxiv.org/abs/1304.6273
Publikováno v:
Phys. Rev. Lett. 111, 055003 (2013)
We show that the self-organized single-helical-axis (SHAx) and double-helical-axis (DAx) states in reversed field pinches can be reproduced in a minimally constrained equilibrium model using only five parameters. This is a significant reduction on pr
Externí odkaz:
http://arxiv.org/abs/1302.5458
Publikováno v:
Phys. Plasmas 20, 032509 (2013)
We show the stepped-pressure equilibria that are obtained from a generalization of Taylor relaxation known as multi-region, relaxed MHD (MRXMHD) are also generalizations of ideal MHD. We show this by proving that as the number of plasma regions becom
Externí odkaz:
http://arxiv.org/abs/1212.4917
Autor:
Hudson, S. R., Dewar, R. L., Dennis, G., Hole, M. J., McGann, M., von Nessi, G., Lazerson, S.
We describe the construction of stepped-pressure equilibria as extrema of a multi-region, relaxed magnetohydrodynamic (MHD) energy functional that combines elements of ideal MHD and Taylor relaxation, and which we call MRXMHD. The model is compatible
Externí odkaz:
http://arxiv.org/abs/1211.3072