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Hamiltonian magnetohydrodynamics: Lagrangian, Eulerian, and dynamically accessible stability—Examples with translation symmetry

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4964900· OSTI ID:1535285
Because different constraints are imposed, stability conditions for dissipationless fluids and magnetofluids may take different forms when derived within the Lagrangian, Eulerian (energy-Casimir), or dynamically accessible frameworks. This is in particular the case when flows are present. These differences are explored explicitly here by working out in detail two magnetohydrodynamic examples: convection against gravity in a stratified fluid and translationally invariant perturbations of a rotating magnetized plasma pinch. In this second example, we show in explicit form how to perform the time-dependent relabeling introduced in Andreussi et al. [Phys. Plasmas 20, 092104 (2013)] that makes it possible to reformulate Eulerian equilibria with flows as Lagrangian equilibria in the relabeled variables. The procedures detailed in the present article provide a paradigm that can be applied to more general plasma configurations and in addition extended to more general plasma descriptions where dissipation is absent.
Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-04ER54742
OSTI ID:
1535285
Alternate ID(s):
OSTI ID: 1329491
Journal Information:
Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 23; ISSN PHPAEN; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

A class of three-dimensional gyroviscous magnetohydrodynamic models text January 2020
Helically symmetric extended magnetohydrodynamics: Hamiltonian formulation and equilibrium variational principles journal May 2018
Structure and structure-preserving algorithms for plasma physics journal April 2017
Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria journal September 2017
Energy-Casimir, dynamically accessible, and Lagrangian stability of extended magnetohydrodynamic equilibria journal January 2020
Energy-Casimir, dynamically accessible, and Lagrangian stability of extended magnetohydrodynamic equilibria text January 2019

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