skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Helically symmetric extended magnetohydrodynamics: Hamiltonian formulation and equilibrium variational principles

Journal Article · · Journal of Plasma Physics

Hamiltonian extended magnetohydrodynamics (XMHD) is restricted to respect helical symmetry by reducing the Poisson bracket for the three-dimensional dynamics to a helically symmetric one, as an extension of the previous study for translationally symmetric XMHD (Kaltsaset al.,Phys. Plasmas, vol. 24, 2017, 092504). Four families of Casimir invariants are obtained directly from the symmetric Poisson bracket and they are used to construct Energy–Casimir variational principles for deriving generalized XMHD equilibrium equations with arbitrary macroscopic flows. The system is then cast into the form of Grad–Shafranov–Bernoulli equilibrium equations. The axisymmetric and the translationally symmetric formulations can be retrieved as geometric reductions of the helically symmetric one. As special cases, the derivation of the corresponding equilibrium equations for incompressible plasmas is discussed and the helically symmetric equilibrium equations for the Hall MHD system are obtained upon neglecting electron inertia. An example of an incompressible double-Beltrami equilibrium is presented in connection with a magnetic configuration having non-planar helical magnetic axis.

Research Organization:
Univ. of Texas, Austin, TX (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FG05-80ET53088
OSTI ID:
1538937
Journal Information:
Journal of Plasma Physics, Vol. 84, Issue 3; ISSN 0022-3778
Publisher:
Cambridge University Press
Country of Publication:
United States
Language:
English

References (53)

On Force-Free Magnetic Fields. journal July 1957
Structure and computation of two-dimensional incompressible extended MHD journal January 2017
Ideal magnetohydrodynamic equilibria with helical symmetry and incompressible flows journal October 1999
Double Curl Beltrami Flow: Diamagnetic Structures journal November 1998
Persistent density perturbations at rational- q surfaces following pellet injection in the Joint European Torus journal November 1987
Hamiltonian four-field model for nonlinear tokamak dynamics journal January 1987
Studies on Magneto-Hydrodynamic Waves and other Anisotropic Wave Motions journal March 1960
Lyapunov stability analysis of magnetohydrodynamic plasma equilibria with axisymmetric toroidal flow journal January 1988
Linear and nonlinear stability criteria for compressible MHD flows in a gravitational field journal June 2013
Action principles for relativistic extended magnetohydrodynamics: A unified theory of magnetofluid models journal February 2017
Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria journal September 2017
Hamiltonian magnetohydrodynamics: Lagrangian, Eulerian, and dynamically accessible stability—Theory journal September 2013
Hamiltonian magnetohydrodynamics: Helically symmetric formulation, Casimir invariants, and equilibrium variational principles journal May 2012
On the variational approach to axisymmetric magnetohydrodynamic equilibria journal September 2008
Hamiltonian description of the ideal fluid journal April 1998
On the Stability of Plasma in Static Equilibrium journal January 1958
MHD equilibrium variational principles with symmetry journal March 2010
Helical equilibria and magnetic structures in the reversed field pinch and analogies to the tokamak and stellarator journal November 2009
Astrophysical jets and outflows journal January 2005
Inertial magnetohydrodynamics journal March 2015
Theory and observations of magnetic islands journal September 2009
Force-free helical equilibria journal November 1973
Variational Principles and Self-Organization in Two-Fluid Plasmas journal February 2002
Hall magnetohydrodynamics: Conservation laws and Lyapunov stability journal January 1987
Helically symmetric equilibria with pressure anisotropy and incompressible plasma flow journal December 2017
Noncanonical Hamiltonian Density Formulation of Hydrodynamics and Ideal Magnetohydrodynamics journal September 1980
JET snake magnetohydrodynamic equilibria journal June 2011
Nonlinear stability of fluid and plasma equilibria journal July 1985
On Hall magnetohydrodynamics equilibria journal October 2006
Stellarator and tokamak plasmas: a comparison journal November 2012
Hamiltonian and action formalisms for two-dimensional gyroviscous magnetohydrodynamics journal August 2014
Tokamak Magnetohydrodynamic Equilibrium States with Axisymmetric Boundary and a 3D Helical Core journal July 2010
Bifurcation to 3D Helical Magnetic Equilibrium in an Axisymmetric Toroidal Device journal December 2011
On energy conservation in extended magnetohydrodynamics journal August 2014
Stability of compressible reduced magnetohydrodynamic equilibria—Analogy with magnetorotational instability journal April 2013
Hamiltonian formulation and analysis of a collisionless fluid reconnection model journal June 2008
Beltrami fields in plasmas: High-confinement mode boundary layers and high beta equilibria journal May 2001
A 3D approach to equilibrium, stability and transport studies in RFX-mod improved regimes journal November 2010
Snake-like phenomena in Tore Supra following pellet injection journal April 1997
The Confinement of Plasma by the Heliotron Magnetic Field journal July 1961
Singular Casimir Elements of the Euler Equation and Equilibrium Points journal April 2013
Hamiltonian magnetohydrodynamics: Lagrangian, Eulerian, and dynamically accessible stability—Examples with translation symmetry journal October 2016
The Stellarator Concept journal January 1958
Self-organized helical equilibria as a new paradigm for ohmically heated fusion plasmas journal June 2009
Magnetohydrodynamic equilibrium. III - Helically symmetric fields. IV - Nonequilibrium of nonsymmetric hydrodynamic topologies journal August 1982
Remarkable connections between extended magnetohydrodynamics models journal July 2015
Über die Ausbreitung von Wellen in einem Plasma journal January 1959
Two-fluid equilibrium with flow: FLOW2 journal September 2015
Linear stability of certain translationally symmetric MHD equilibria with incompressible flow journal January 2017
Some Stable Hydromagnetic Equilibria journal January 1958
Ertel's vorticity theorem and new flux surfaces in multi-fluid plasmas journal September 2013
High β relaxed states with internal conductor plasma configuration journal May 2001
Magnetic Fields in Astrophysical Jets: From Launch to Termination journal June 2012