Comparison of H-mode pedestals in different confinement regimes in DIII-D

R. J. Groebner; A. W. Leonard; T. C. Luce; M. E. Fenstermacher; G. L. Jackson; T. H. Osborne; D. M. Thomas; M. R. Wade

doi:10.1088/0741-3335/48/5A/S10

Comparison of H-mode pedestals in different confinement regimes in DIII-D

R. J. Groebner, A. W. Leonard, T. C. Luce, M. E. Fenstermacher, G. L. Jackson, T. H. Osborne, D. M. Thomas, M. R. Wade

Research output: Contribution to journal › Article › peer-review

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Abstract

A survey of global performance parameters and their correlation with pedestal parameters is performed for standard H-mode, QH-mode and the enhanced confinement regimes of VH-mode, hybrid and advanced tokamak in the DIII-D tokamak. This study shows that there is a trend for global confinement quality or global beta to increase as the pedestal electron pressure or beta increases. However, there are also improvements in core confinement and beta, observed at fixed pedestal pressure or beta, which indicate that factors other than pedestal parameters also contribute to the best core performance. Several other pedestal structure parameters are found to be similar among these regimes. The scale lengths for electron pressure in the pedestal are in the range 0.8-1.6 cm at the outer midplane, most η_e values are in the range 1-3 in the middle of the T_e pedestal and the T_e and n_e pedestals tend to penetrate the same distance into the plasma.

Original language	English
Pages (from-to)	A109-A119
Journal	Plasma Physics and Controlled Fusion
Volume	48
Issue number	5 A
DOIs	https://doi.org/10.1088/0741-3335/48/5A/S10
State	Published - May 2006
Externally published	Yes

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title = "Comparison of H-mode pedestals in different confinement regimes in DIII-D",

abstract = "A survey of global performance parameters and their correlation with pedestal parameters is performed for standard H-mode, QH-mode and the enhanced confinement regimes of VH-mode, hybrid and advanced tokamak in the DIII-D tokamak. This study shows that there is a trend for global confinement quality or global beta to increase as the pedestal electron pressure or beta increases. However, there are also improvements in core confinement and beta, observed at fixed pedestal pressure or beta, which indicate that factors other than pedestal parameters also contribute to the best core performance. Several other pedestal structure parameters are found to be similar among these regimes. The scale lengths for electron pressure in the pedestal are in the range 0.8-1.6 cm at the outer midplane, most ηe values are in the range 1-3 in the middle of the Te pedestal and the Te and ne pedestals tend to penetrate the same distance into the plasma.",

author = "Groebner, {R. J.} and Leonard, {A. W.} and Luce, {T. C.} and Fenstermacher, {M. E.} and Jackson, {G. L.} and Osborne, {T. H.} and Thomas, {D. M.} and Wade, {M. R.}",

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T1 - Comparison of H-mode pedestals in different confinement regimes in DIII-D

AU - Groebner, R. J.

AU - Leonard, A. W.

AU - Luce, T. C.

AU - Fenstermacher, M. E.

AU - Jackson, G. L.

AU - Osborne, T. H.

AU - Thomas, D. M.

AU - Wade, M. R.

PY - 2006/5

Y1 - 2006/5

N2 - A survey of global performance parameters and their correlation with pedestal parameters is performed for standard H-mode, QH-mode and the enhanced confinement regimes of VH-mode, hybrid and advanced tokamak in the DIII-D tokamak. This study shows that there is a trend for global confinement quality or global beta to increase as the pedestal electron pressure or beta increases. However, there are also improvements in core confinement and beta, observed at fixed pedestal pressure or beta, which indicate that factors other than pedestal parameters also contribute to the best core performance. Several other pedestal structure parameters are found to be similar among these regimes. The scale lengths for electron pressure in the pedestal are in the range 0.8-1.6 cm at the outer midplane, most ηe values are in the range 1-3 in the middle of the Te pedestal and the Te and ne pedestals tend to penetrate the same distance into the plasma.

AB - A survey of global performance parameters and their correlation with pedestal parameters is performed for standard H-mode, QH-mode and the enhanced confinement regimes of VH-mode, hybrid and advanced tokamak in the DIII-D tokamak. This study shows that there is a trend for global confinement quality or global beta to increase as the pedestal electron pressure or beta increases. However, there are also improvements in core confinement and beta, observed at fixed pedestal pressure or beta, which indicate that factors other than pedestal parameters also contribute to the best core performance. Several other pedestal structure parameters are found to be similar among these regimes. The scale lengths for electron pressure in the pedestal are in the range 0.8-1.6 cm at the outer midplane, most ηe values are in the range 1-3 in the middle of the Te pedestal and the Te and ne pedestals tend to penetrate the same distance into the plasma.

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SN - 0741-3335

VL - 48

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JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 5 A

ER -

Comparison of H-mode pedestals in different confinement regimes in DIII-D

Abstract

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