L-H threshold studies in NSTX

S. M. Kaye; R. Maingi; D. Battaglia; R. E. Bell; C. S. Chang; J. Hosea; H. Kugel; B. P. Leblanc; H. Meyer; G. Y. Park; J. R. Wilson

doi:10.1088/0029-5515/51/11/113019

L-H threshold studies in NSTX

S. M. Kaye, R. Maingi, D. Battaglia, R. E. Bell, C. S. Chang, J. Hosea, H. Kugel, B. P. Leblanc, H. Meyer, G. Y. Park, J. R. Wilson

PPPL NSTX

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45 Scopus citations

Abstract

Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium versus helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n = 3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in T_e, n_e, p_e, T _i, v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H_98y,2 ∼ 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.

Original language	English (US)
Article number	113019
Journal	Nuclear Fusion
Volume	51
Issue number	11
DOIs	https://doi.org/10.1088/0029-5515/51/11/113019
State	Published - Nov 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/51/11/113019

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title = "L-H threshold studies in NSTX",

abstract = "Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium versus helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n = 3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in Te, ne, pe, T i, v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H98y,2 ∼ 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.",

author = "Kaye, \{S. M.\} and R. Maingi and D. Battaglia and Bell, \{R. E.\} and Chang, \{C. S.\} and J. Hosea and H. Kugel and Leblanc, \{B. P.\} and H. Meyer and Park, \{G. Y.\} and Wilson, \{J. R.\}",

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T1 - L-H threshold studies in NSTX

AU - Kaye, S. M.

AU - Maingi, R.

AU - Battaglia, D.

AU - Bell, R. E.

AU - Chang, C. S.

AU - Hosea, J.

AU - Kugel, H.

AU - Leblanc, B. P.

AU - Meyer, H.

AU - Park, G. Y.

AU - Wilson, J. R.

PY - 2011/11

Y1 - 2011/11

N2 - Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium versus helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n = 3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in Te, ne, pe, T i, v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H98y,2 ∼ 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.

AB - Recent experiments in the low aspect ratio National Spherical Torus Experiment (NSTX) have been run in support of the high priority ITER and ITPA issue of access to the H-mode. Specifically, a series of experiments showed reduced power threshold values for deuterium versus helium plasmas, and for plasmas with lower current, lower triangularity and with lithium conditioning. Application of n = 3 fields at the plasma edge resulted in higher power thresholds. To within the constraints of temporal and spatial resolutions, no systematic difference in Te, ne, pe, T i, v or their derivatives was found in discharges that transitioned into the H-mode versus those at slightly lower power that did not. Finally, H98y,2 ∼ 1 confinement quality could be achieved for powers just above the threshold power in ELM-free conditions.

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VL - 51

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L-H threshold studies in NSTX

Abstract

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