Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas

O. Schmitz*, T. E. Evans, M. E. Fenstermacher, E. A. Unterberg, M. E. Austin, B. D. Bray, N. H. Brooks, H. Frerichs, M. Groth, M. W. Jakubowski, C. J. Lasnier, M. Lehnen, A. W. Leonard, S. Mordijck, R. A. Moyer, T. H. Osborne, D. Reiter, U. Samm, M. J. Schaffer, B. UnterbergW. P. West, DII-D Team, TEXTOR

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

49 Citations (Scopus)

Abstract

Good alignment of the magnetic field line pitch angle with the mode structure of an external resonant magnetic perturbation (RMP) field is shown to induce modulation of the pedestal electron pressure pe in high confinement high rotation plasmas at the DIII-D tokamak with a shape similar to ITER, the next step tokamak experiment. This is caused by an edge safety factor q95 resonant enhancement of the thermal transport, while in contrast, the RMP induced particle pump out does not show a significant resonance. The measured pe reduction correlates to an increase in the modeled stochastic layer width during pitch angle variations matching results from resistive low rotation plasmas at the TEXTOR tokamak. These findings suggest a field line pitch angle resonant formation of a stochastic magnetic edge layer as an explanation for the q95 resonant character of type-I edge localized mode suppression by RMPs.

Original languageEnglish
Article number165005
Pages (from-to)1-4
Number of pages4
JournalPhysical Review Letters
Volume103
Issue number16
DOIs
Publication statusPublished - 16 Oct 2009
MoE publication typeA1 Journal article-refereed

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    Schmitz, O., Evans, T. E., Fenstermacher, M. E., Unterberg, E. A., Austin, M. E., Bray, B. D., Brooks, N. H., Frerichs, H., Groth, M., Jakubowski, M. W., Lasnier, C. J., Lehnen, M., Leonard, A. W., Mordijck, S., Moyer, R. A., Osborne, T. H., Reiter, D., Samm, U., Schaffer, M. J., ... TEXTOR (2009). Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas. Physical Review Letters, 103(16), 1-4. [165005]. https://doi.org/10.1103/PhysRevLett.103.165005