Extended MHD modeling of tearing-driven magnetic relaxation

Sauppe, J. P.; Sovinec, C. R.

doi:10.1063/1.4977540

Title: Extended MHD modeling of tearing-driven magnetic relaxation

Journal Article · Mon Mar 06 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4977540· OSTI ID:1461732

^[1]; Sovinec, C. R. ^[2]

Univ. of Wisconsin, Madison, WI (United States). Center for Plasma Theory and Computation and Dept. of Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Wisconsin, Madison, WI (United States). Center for Plasma Theory and Dept. of Engineering-Physics

Discrete relaxation events in reversed-field pinch relevant configurations are investigated numerically with nonlinear extended magnetohydrodynamic modeling, including the Hall term in Ohm’s law and first-order ion finite Larmor radius effects. Our results show variability among relaxation events, where the Hall dynamo effect may help or impede the MHD dynamo effect in relaxing the parallel current density profile. The competitive behavior arises from multi-helicity conditions where the dominant magnetic fluctuation is relatively small. The resulting changes in parallel current density and parallel flow are aligned in the core, consistent with experimental observations. Analysis of simulation results also confirms that force density from fluctuation-induced Reynolds stress arises subsequent to the drive from fluctuation-induced Lorentz force density. Transport of momentum density is found to be dominated by the fluctuation-induced Maxwell stress over most of the cross section with viscous and gyroviscous contributions being large in the edge region. The findings resolve a discrepancy with respect to the relative orientation of current density and flow relaxation, which had not been realized or investigated in Ref. [King et. al. Phys. Plasmas 19, 055905 (2012)], where only the magnitude of flow relaxation is actually consistent with experimental results.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)

Grant/Contract Number:: FG02-06ER54850; PHY-0821899; AC02-05CH11231

OSTI ID:: 1461732

Alternate ID(s):: OSTI ID: 1348031

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; 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 works

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Intrinsic flow and tearing mode rotation in the RFP during improved confinement Craig, D.; Tan, E. H.; Schott, B. Physics of Plasmas, Vol. 26, Issue 7 https://doi.org/10.1063/1.5095620	journal	July 2019

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Title: Extended MHD modeling of tearing-driven magnetic relaxation

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