Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code
Abstract
The SIESTA magnetohydrodynamic (MHD) equilibrium code has been used to compute a sequence of ideally stable equilibria resulting from numerical variation of the helical resonant magnetic perturbation (RMP) applied to an axisymmetric DIII-D plasma equilibrium. Increasing the perturbation strength at the dominant m=2, n=-1 , resonant surface leads to lower MHD energies and increases in the equilibrium island widths at the m=2 (and sidebands) surfaces, in agreement with theoretical expectations. Island overlap at large perturbation strengths leads to stochastic magnetic fields which correlate well with the experimentally inferred field structure. The magnitude and spatial phase (around the dominant rational surfaces) of the resonant (shielding) component of the parallel current are shown to change qualitatively with the magnetic island topology.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fusion and Materials for Nuclear Systems Division
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1325426
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Plasma Physics
- Additional Journal Information:
- Journal Volume: 82; Journal Issue: 02; Journal ID: ISSN 0022-3778
- Publisher:
- Cambridge University Press
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Hirshman, S. P., Shafer, M. W., Seal, S. K., and Canik, J. M. Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code. United States: N. p., 2016.
Web. doi:10.1017/S0022377816000143.
Hirshman, S. P., Shafer, M. W., Seal, S. K., & Canik, J. M. Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code. United States. https://doi.org/10.1017/S0022377816000143
Hirshman, S. P., Shafer, M. W., Seal, S. K., and Canik, J. M. Thu .
"Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code". United States. https://doi.org/10.1017/S0022377816000143. https://www.osti.gov/servlets/purl/1325426.
@article{osti_1325426,
title = {Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code},
author = {Hirshman, S. P. and Shafer, M. W. and Seal, S. K. and Canik, J. M.},
abstractNote = {The SIESTA magnetohydrodynamic (MHD) equilibrium code has been used to compute a sequence of ideally stable equilibria resulting from numerical variation of the helical resonant magnetic perturbation (RMP) applied to an axisymmetric DIII-D plasma equilibrium. Increasing the perturbation strength at the dominant m=2, n=-1 , resonant surface leads to lower MHD energies and increases in the equilibrium island widths at the m=2 (and sidebands) surfaces, in agreement with theoretical expectations. Island overlap at large perturbation strengths leads to stochastic magnetic fields which correlate well with the experimentally inferred field structure. The magnitude and spatial phase (around the dominant rational surfaces) of the resonant (shielding) component of the parallel current are shown to change qualitatively with the magnetic island topology.},
doi = {10.1017/S0022377816000143},
journal = {Journal of Plasma Physics},
number = 02,
volume = 82,
place = {United States},
year = {Thu Mar 03 00:00:00 EST 2016},
month = {Thu Mar 03 00:00:00 EST 2016}
}
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Works referencing / citing this record:
3D equilibrium reconstruction with islands
journal, March 2018
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