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Title: Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria

Abstract

The Hamiltonian structure of ideal translationally symmetric extended MHD (XMHD) is obtained by employing a method of Hamiltonian reduction on the three-dimensional noncanonical Poisson bracket of XMHD. The existence of the continuous spatial translation symmetry allows the introduction of Clebsch-like forms for the magnetic and velocity fields. Upon employing the chain rule for functional derivatives, the 3D Poisson bracket is reduced to its symmetric counterpart. The sets of symmetric Hall, Inertial, and extended MHD Casimir invariants are identified, and used to obtain energy-Casimir variational principles for generalized XMHD equilibrium equations with arbitrary macroscopic flows. The obtained set of generalized equations is cast into Grad-Shafranov-Bernoulli (GSB) type, and special cases are investigated: static plasmas, equilibria with longitudinal flows only, and Hall MHD equilibria, where the electron inertia is neglected. The barotropic Hall MHD equilibrium equations are derived as a limiting case of the XMHD GSB system, and a numerically computed equilibrium configuration is presented that shows the separation of ion-flow from electro-magnetic surfaces.

Authors:
 [1];  [1]; ORCiD logo [2]
  1. Univ. of Ioannina, Ioannina (Greece). Dept. of Physics
  2. Univ. of Texas, Austin, TX (United States). Dept. of Physics and Inst. for Fusion Studies
Publication Date:
Research Org.:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1535314
Alternate Identifier(s):
OSTI ID: 1374779
Grant/Contract Number:  
FG05-80ET-53088
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 9; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics

Citation Formats

Kaltsas, D. A., Throumoulopoulos, G. N., and Morrison, P. J. Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria. United States: N. p., 2017. Web. doi:10.1063/1.4986013.
Kaltsas, D. A., Throumoulopoulos, G. N., & Morrison, P. J. Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria. United States. https://doi.org/10.1063/1.4986013
Kaltsas, D. A., Throumoulopoulos, G. N., and Morrison, P. J. Fri . "Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria". United States. https://doi.org/10.1063/1.4986013. https://www.osti.gov/servlets/purl/1535314.
@article{osti_1535314,
title = {Translationally symmetric extended MHD via Hamiltonian reduction: Energy-Casimir equilibria},
author = {Kaltsas, D. A. and Throumoulopoulos, G. N. and Morrison, P. J.},
abstractNote = {The Hamiltonian structure of ideal translationally symmetric extended MHD (XMHD) is obtained by employing a method of Hamiltonian reduction on the three-dimensional noncanonical Poisson bracket of XMHD. The existence of the continuous spatial translation symmetry allows the introduction of Clebsch-like forms for the magnetic and velocity fields. Upon employing the chain rule for functional derivatives, the 3D Poisson bracket is reduced to its symmetric counterpart. The sets of symmetric Hall, Inertial, and extended MHD Casimir invariants are identified, and used to obtain energy-Casimir variational principles for generalized XMHD equilibrium equations with arbitrary macroscopic flows. The obtained set of generalized equations is cast into Grad-Shafranov-Bernoulli (GSB) type, and special cases are investigated: static plasmas, equilibria with longitudinal flows only, and Hall MHD equilibria, where the electron inertia is neglected. The barotropic Hall MHD equilibrium equations are derived as a limiting case of the XMHD GSB system, and a numerically computed equilibrium configuration is presented that shows the separation of ion-flow from electro-magnetic surfaces.},
doi = {10.1063/1.4986013},
journal = {Physics of Plasmas},
number = 9,
volume = 24,
place = {United States},
year = {Fri Aug 11 00:00:00 EDT 2017},
month = {Fri Aug 11 00:00:00 EDT 2017}
}

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