A neoclassical driftmagnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant errorfield in a high temperature tokamak plasma
Abstract
A twofluid, neoclassical theory of the interaction of a single magnetic island chain with a resonant errorfield in a quasicylindrical, lowβ, tokamak plasma is presented. The plasmas typically found in large hot tokamaks lie in the socalled weak neoclassical flowdamping regime in which the neoclassical ion stress tensor is not the dominant term in the ion parallel equation of motion. Nevertheless, flowdamping in such plasmas dominates ion perpendicular viscosity, and is largely responsible for determining the phase velocity of a freely rotating island chain (which is in the ion diamagnetic direction relative to the local E × B frame at the rational surface). The critical vacuum island width required to lock the island chain is mostly determined by the ion neoclassical poloidal flow damping rate at the rational surface. The stabilizing effect of the average fieldline curvature, as well as the destabilizing effect of the perturbed bootstrap current, is the same for a freely rotating, a nonuniformly rotating, and a locked island chain. The destabilizing effect of the errorfield averages to zero when the chain is rotating and only manifests itself when the chain locks. The perturbed ion polarization current has a small destabilizing effect on a freely rotating islandmore »
 Authors:

 Univ. of Texas, Austin, TX (United States). Dept. of Physics, Inst. for Fusion Studies
 Publication Date:
 Research Org.:
 Univ. of Texas, Austin, TX (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC)
 OSTI Identifier:
 1540170
 Alternate Identifier(s):
 OSTI ID: 1431393
 Grant/Contract Number:
 FG0204ER54742
 Resource Type:
 Journal Article: Accepted Manuscript
 Journal Name:
 Physics of Plasmas
 Additional Journal Information:
 Journal Volume: 25; Journal Issue: 4; Journal ID: ISSN 1070664X
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; physics
Citation Formats
Fitzpatrick, Richard. A neoclassical driftmagnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant errorfield in a high temperature tokamak plasma. United States: N. p., 2018.
Web. doi:10.1063/1.5022685.
Fitzpatrick, Richard. A neoclassical driftmagnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant errorfield in a high temperature tokamak plasma. United States. doi:10.1063/1.5022685.
Fitzpatrick, Richard. Thu .
"A neoclassical driftmagnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant errorfield in a high temperature tokamak plasma". United States. doi:10.1063/1.5022685. https://www.osti.gov/servlets/purl/1540170.
@article{osti_1540170,
title = {A neoclassical driftmagnetohydrodynamical fluid model of the interaction of a magnetic island chain with a resonant errorfield in a high temperature tokamak plasma},
author = {Fitzpatrick, Richard},
abstractNote = {A twofluid, neoclassical theory of the interaction of a single magnetic island chain with a resonant errorfield in a quasicylindrical, lowβ, tokamak plasma is presented. The plasmas typically found in large hot tokamaks lie in the socalled weak neoclassical flowdamping regime in which the neoclassical ion stress tensor is not the dominant term in the ion parallel equation of motion. Nevertheless, flowdamping in such plasmas dominates ion perpendicular viscosity, and is largely responsible for determining the phase velocity of a freely rotating island chain (which is in the ion diamagnetic direction relative to the local E × B frame at the rational surface). The critical vacuum island width required to lock the island chain is mostly determined by the ion neoclassical poloidal flow damping rate at the rational surface. The stabilizing effect of the average fieldline curvature, as well as the destabilizing effect of the perturbed bootstrap current, is the same for a freely rotating, a nonuniformly rotating, and a locked island chain. The destabilizing effect of the errorfield averages to zero when the chain is rotating and only manifests itself when the chain locks. The perturbed ion polarization current has a small destabilizing effect on a freely rotating island chain, but a large destabilizing effect on both a nonuniformly rotating and a locked island chain. Finally, this behavior may account for the experimentally observed fact that locked island chains are much more unstable than corresponding freely rotating chains.},
doi = {10.1063/1.5022685},
journal = {Physics of Plasmas},
issn = {1070664X},
number = 4,
volume = 25,
place = {United States},
year = {2018},
month = {4}
}
Web of Science
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