Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code

Hirshman, S. P.; Shafer, M. W.; Seal, S. K.; Canik, J. M.

doi:10.1017/S0022377816000143

Title: Investigation of island formation due to RMPs in DIII-D plasmas with the SIESTA resistive MHD equilibrium code

Journal Article · Thu Mar 03 00:00:00 EST 2016 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377816000143· OSTI ID:1325426

Hirshman, S. P. ^[1]; Shafer, M. W. ^[1]; Seal, S. K. ^[2]; Canik, J. M. ^[1]

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

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1325426

Journal Information:: Journal of Plasma Physics, Vol. 82, Issue 02; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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References (16)

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3D equilibrium reconstruction with islands Cianciosa, M.; Hirshman, S. P.; Seal, S. K. Plasma Physics and Controlled Fusion, Vol. 60, Issue 4 https://doi.org/10.1088/1361-6587/aaaf90	journal	March 2018

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