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Title: Helical temperature perturbations associated with radially asymmetric magnetic island chains in tokamak plasmas

Abstract

The simple analysis of Rutherford is generalized in order to incorporate radial magnetic island asymmetry into the nonlinear theory of tearing mode stability in a low- β, large aspect-ratio, quasi-cylindrical, tokamak plasma. The calculation is restricted to cases in which the radial shifts of the island X- and O-points are (almost) equal and opposite. For the sake of simplicity, the calculation concentrates on a particular (but fairly general) class of radially asymmetric island magnetic flux-surfaces that can all be mapped to the same symmetric flux-surfaces by means of a suitable coordinate transform. Finally, the combination of island asymmetry (in which the radial shifts of the X- and O-points are almost equal and opposite) and temperature-induced changes in the inductive current profile in the immediate vicinity of the island is found to have no effect on tearing mode stability.

Authors:
 [1]
  1. 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:
1535289
Alternate Identifier(s):
OSTI ID: 1334546
Grant/Contract Number:  
FG02-04ER54742; FG02-04ER-54742
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 12; 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

Fitzpatrick, Richard. Helical temperature perturbations associated with radially asymmetric magnetic island chains in tokamak plasmas. United States: N. p., 2016. Web. doi:10.1063/1.4968833.
Fitzpatrick, Richard. Helical temperature perturbations associated with radially asymmetric magnetic island chains in tokamak plasmas. United States. doi:10.1063/1.4968833.
Fitzpatrick, Richard. Mon . "Helical temperature perturbations associated with radially asymmetric magnetic island chains in tokamak plasmas". United States. doi:10.1063/1.4968833. https://www.osti.gov/servlets/purl/1535289.
@article{osti_1535289,
title = {Helical temperature perturbations associated with radially asymmetric magnetic island chains in tokamak plasmas},
author = {Fitzpatrick, Richard},
abstractNote = {The simple analysis of Rutherford is generalized in order to incorporate radial magnetic island asymmetry into the nonlinear theory of tearing mode stability in a low-β, large aspect-ratio, quasi-cylindrical, tokamak plasma. The calculation is restricted to cases in which the radial shifts of the island X- and O-points are (almost) equal and opposite. For the sake of simplicity, the calculation concentrates on a particular (but fairly general) class of radially asymmetric island magnetic flux-surfaces that can all be mapped to the same symmetric flux-surfaces by means of a suitable coordinate transform. Finally, the combination of island asymmetry (in which the radial shifts of the X- and O-points are almost equal and opposite) and temperature-induced changes in the inductive current profile in the immediate vicinity of the island is found to have no effect on tearing mode stability.},
doi = {10.1063/1.4968833},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 12,
volume = 23,
place = {United States},
year = {2016},
month = {12}
}

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