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. Unterberg; W. P. West

doi:10.1103/PhysRevLett.103.165005

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

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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 language	English
Article number	165005
Journal	Physical Review Letters
Volume	103
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.103.165005
State	Published - Oct 16 2009
Externally published	Yes

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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., ... West, W. P. (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), Article 165005. https://doi.org/10.1103/PhysRevLett.103.165005

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

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.",

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

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doi = "10.1103/PhysRevLett.103.165005",

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Schmitz, O, Evans, TE, Fenstermacher, ME, Unterberg, EA, Austin, ME, Bray, BD, Brooks, NH, Frerichs, H, Groth, M, Jakubowski, MW, Lasnier, CJ, Lehnen, M, Leonard, AW, Mordijck, S, Moyer, RA, Osborne, TH, Reiter, D, Samm, U, Schaffer, MJ, Unterberg, B & West, WP 2009, 'Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas', Physical Review Letters, vol. 103, no. 16, 165005. https://doi.org/10.1103/PhysRevLett.103.165005

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T1 - Resonant Pedestal Pressure Reduction Induced by a Thermal Transport Enhancement due to Stochastic Magnetic Boundary Layers in High Temperature Plasmas

AU - Schmitz, O.

AU - Evans, T. E.

AU - Fenstermacher, M. E.

AU - Unterberg, E. A.

AU - Austin, M. E.

AU - Bray, B. D.

AU - Brooks, N. H.

AU - Frerichs, H.

AU - Groth, M.

AU - Jakubowski, M. W.

AU - Lasnier, C. J.

AU - Lehnen, M.

AU - Leonard, A. W.

AU - Mordijck, S.

AU - Moyer, R. A.

AU - Osborne, T. H.

AU - Reiter, D.

AU - Samm, U.

AU - Schaffer, M. J.

AU - Unterberg, B.

AU - West, W. P.

PY - 2009/10/16

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N2 - 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.

AB - 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.

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

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