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Title: The effect of sheared toroidal rotation on pressure driven magnetic islands in toroidal plasmas

Abstract

The impact of sheared toroidal rotation on the evolution of pressure driven magnetic islands in tokamak plasmas is investigated using a resistive magnetohydrodynamics model augmented by a neoclassical Ohm’s law. Particular attention is paid to the asymptotic matching data as the Mercier indices are altered in the presence of sheared flow. Analysis of the nonlinear island Grad- Shafranov equation shows that sheared flows tend to amplify the stabilizing pressure/curvature contribution to pressure driven islands in toroidal tokamaks relative to the island bootstrap current contribution. Finally, as such, sheared toroidal rotation tends to reduce saturated magnetic island widths.

Authors:
ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics and Physics
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1471501
Alternate Identifier(s):
OSTI ID: 1254365
Grant/Contract Number:  
FG02-86ER53218; FG02-92ER54139
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; 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

Hegna, C. C. The effect of sheared toroidal rotation on pressure driven magnetic islands in toroidal plasmas. United States: N. p., 2016. Web. doi:10.1063/1.4952627.
Hegna, C. C. The effect of sheared toroidal rotation on pressure driven magnetic islands in toroidal plasmas. United States. doi:10.1063/1.4952627.
Hegna, C. C. Wed . "The effect of sheared toroidal rotation on pressure driven magnetic islands in toroidal plasmas". United States. doi:10.1063/1.4952627. https://www.osti.gov/servlets/purl/1471501.
@article{osti_1471501,
title = {The effect of sheared toroidal rotation on pressure driven magnetic islands in toroidal plasmas},
author = {Hegna, C. C.},
abstractNote = {The impact of sheared toroidal rotation on the evolution of pressure driven magnetic islands in tokamak plasmas is investigated using a resistive magnetohydrodynamics model augmented by a neoclassical Ohm’s law. Particular attention is paid to the asymptotic matching data as the Mercier indices are altered in the presence of sheared flow. Analysis of the nonlinear island Grad- Shafranov equation shows that sheared flows tend to amplify the stabilizing pressure/curvature contribution to pressure driven islands in toroidal tokamaks relative to the island bootstrap current contribution. Finally, as such, sheared toroidal rotation tends to reduce saturated magnetic island widths.},
doi = {10.1063/1.4952627},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}

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