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Title: Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales

Abstract

The direction of cascades in a two-dimensional model that takes electron inertia and ion sound Larmor radius into account is studied here, resulting in analytical expressions for the absolute equilibrium states of the energy and helicities. These states suggest that typically both the energy and magnetic helicity at scales shorter than the electron skin depth have a direct cascade, while at large scales the helicity has an inverse cascade as established earlier for reduced magnetohydrodynamics (MHD). The calculations imply that the introduction of gyro-effects allows for the existence of negative temperature (conjugate to energy) states and the condensation of energy to the large scales. Comparisons between two- and three-dimensional extended MHD models (MHD with two-fluid effects) show qualitative agreement between the two.

Authors:
 [1]; ORCiD logo [1];  [2]
  1. Univ. of Texas, Austin, TX (United States). Dept. of Physics. Inst. for Fusion Studies
  2. Aix Marseille Univ., Marseille (France); Univ. Côte d'Azur, Nice (France). Côte d'Azur Observatory
Publication Date:
Research Org.:
Univ. of Texas, Austin, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1523477
Alternate Identifier(s):
OSTI ID: 1461243
Grant/Contract Number:  
FG02-04ER54742
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 7; 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

Citation Formats

Miloshevich, George, Morrison, Philip J., and Tassi, Emanuele. Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales. United States: N. p., 2018. Web. doi:10.1063/1.5023089.
Miloshevich, George, Morrison, Philip J., & Tassi, Emanuele. Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales. United States. doi:10.1063/1.5023089.
Miloshevich, George, Morrison, Philip J., and Tassi, Emanuele. Mon . "Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales". United States. doi:10.1063/1.5023089. https://www.osti.gov/servlets/purl/1523477.
@article{osti_1523477,
title = {Direction of cascades in a magnetofluid model with electron skin depth and ion sound Larmor radius scales},
author = {Miloshevich, George and Morrison, Philip J. and Tassi, Emanuele},
abstractNote = {The direction of cascades in a two-dimensional model that takes electron inertia and ion sound Larmor radius into account is studied here, resulting in analytical expressions for the absolute equilibrium states of the energy and helicities. These states suggest that typically both the energy and magnetic helicity at scales shorter than the electron skin depth have a direct cascade, while at large scales the helicity has an inverse cascade as established earlier for reduced magnetohydrodynamics (MHD). The calculations imply that the introduction of gyro-effects allows for the existence of negative temperature (conjugate to energy) states and the condensation of energy to the large scales. Comparisons between two- and three-dimensional extended MHD models (MHD with two-fluid effects) show qualitative agreement between the two.},
doi = {10.1063/1.5023089},
journal = {Physics of Plasmas},
number = 7,
volume = 25,
place = {United States},
year = {2018},
month = {7}
}

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