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Title: The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas

Abstract

Magnetic field fluctuations are observed in current-carrying stellarator plasmas when the rotational transform is close to a rational value at the edge of the plasma. At low plasma pressure, these fluctuations are associated with perturbed currents parallel to the equilibrium magnetic field lines. A model for these magnetohydrodynamic modes in a low-β, three-dimensional stellarator equilibria has been developed. A set of helical current filaments are constrained to mimic the structure of magnetic field lines on rational surfaces derived from three-dimensional (3D) equilibrium reconstructions. Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. The developed procedure accurately captures phase and amplitude variation for m/n = 3/2, 3/1, and 4/1 modes in the 3D equilibria of the compact toroidal hybrid experiment.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]
+ Show Author Affiliations
  1. University of Wisconsin, Madison, WI (United States); Auburn University, AL (United States)
  2. Auburn University, AL (United States)
Publication Date:
Research Org.:
Auburn Univ., AL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); Auburn University
OSTI Identifier:
1978949
Alternate Identifier(s):
OSTI ID: 1828829
Grant/Contract Number:  
FG02-00ER54610; FG02-03ER54692; FG02-03ER546292; FG-02-00ER54610
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 28; Journal Issue: 11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; sensors; associative algebra; potential theory; vector fields; plasma codes; magnetohydrodynamics; plasma confinement; plasma diagnostics; plasma properties and parameters; stellarators

Citation Formats

Pandya, M. D., Ennis, D. A., Hanson, J. D., Hartwell, G. J., and Maurer, D. A. The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas. United States: N. p., 2021. Web. doi:10.1063/5.0061806.
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Pandya, M. D., Ennis, D. A., Hanson, J. D., Hartwell, G. J., & Maurer, D. A. The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas. United States. https://doi.org/10.1063/5.0061806
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Pandya, M. D., Ennis, D. A., Hanson, J. D., Hartwell, G. J., and Maurer, D. A. Wed . "The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas". United States. https://doi.org/10.1063/5.0061806. https://www.osti.gov/servlets/purl/1978949.
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@article{osti_1978949,
title = {The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasmas},
author = {Pandya, M. D. and Ennis, D. A. and Hanson, J. D. and Hartwell, G. J. and Maurer, D. A.},
abstractNote = {Magnetic field fluctuations are observed in current-carrying stellarator plasmas when the rotational transform is close to a rational value at the edge of the plasma. At low plasma pressure, these fluctuations are associated with perturbed currents parallel to the equilibrium magnetic field lines. A model for these magnetohydrodynamic modes in a low-β, three-dimensional stellarator equilibria has been developed. A set of helical current filaments are constrained to mimic the structure of magnetic field lines on rational surfaces derived from three-dimensional (3D) equilibrium reconstructions. Transformation to straight field line coordinates then allows fitting of the poloidal magnetic sensor data to a single harmonic function, which fixes the modeled toroidal mode structure via the field line flow geometry. The developed procedure accurately captures phase and amplitude variation for m/n = 3/2, 3/1, and 4/1 modes in the 3D equilibria of the compact toroidal hybrid experiment.},
doi = {10.1063/5.0061806},
journal = {Physics of Plasmas},
number = 11,
volume = 28,
place = {United States},
year = {Wed Nov 03 00:00:00 EDT 2021},
month = {Wed Nov 03 00:00:00 EDT 2021}
}
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Journal Article:
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https://doi.org/10.1063/5.0061806
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