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

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

doi:10.1103/PhysRevLett.103.165005

Journal Article

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

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

2009
APS College Park, Md.

Physical review letters 103, 165005 (2009) [10.1103/PhysRevLett.103.165005]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7217 doi:10.1103/PhysRevLett.103.165005

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 p(e) 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 q(95) resonant enhancement of the thermal transport, while in contrast, the RMP induced particle pump out does not show a significant resonance. The measured p(e) 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 q(95) resonant character of type-I edge localized mode suppression by RMPs.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: This work was supported in part by the U.S. Department of Energy under Grants No. DE-FC02-04ER54698, No. DE-AC52-07NA27344, No. DE-AC05-06ER23100, and No. DE-FG02-07ER54917.

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