Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

J. M. Canik; A. C. Sontag; R. Maingi; R. Bell; D. A. Gates; S. P. Gerhardt; H. W. Kugel; B. P. Leblanc; J. Menard; S. Paul; S. Sabbagh; V. A. Soukhanovskii

doi:10.1088/0029-5515/50/6/064016

Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

J. M. Canik, A. C. Sontag, R. Maingi, R. Bell, D. A. Gates, S. P. Gerhardt, H. W. Kugel, B. P. Leblanc, J. Menard, S. Paul, S. Sabbagh, V. A. Soukhanovskii

Fusion Energy Division

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

17 Scopus citations

Abstract

The application of non-axisymmetric magnetic perturbations has been shown to destabilize edge-localized modes (ELMs) in the National Spherical Torus Experiment. This ELM-triggering effect is used to controllably introduce ELMs into lithium-enhanced ELM-free H-mode discharges, reducing the typical impurity accumulation while maintaining high energy confinement. Recent improvements to the triggering techniques are described. The perturbation waveform has been improved, with large amplitude, short duration perturbations allowing rapid, highly reliable triggering, with reduced braking of toroidal rotation. The rapid triggering allowed the ELM frequency to be increased to over 60 Hz, leading to a reduction in the average ELM size. Combined with improved gas fuelling, this method has resulted in periods of stationary global conditions, although plasma profiles do continue to evolve.

Original language	English
Article number	064016
Journal	Nuclear Fusion
Volume	50
Issue number	6
DOIs	https://doi.org/10.1088/0029-5515/50/6/064016
State	Published - 2010

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title = "Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX",

abstract = "The application of non-axisymmetric magnetic perturbations has been shown to destabilize edge-localized modes (ELMs) in the National Spherical Torus Experiment. This ELM-triggering effect is used to controllably introduce ELMs into lithium-enhanced ELM-free H-mode discharges, reducing the typical impurity accumulation while maintaining high energy confinement. Recent improvements to the triggering techniques are described. The perturbation waveform has been improved, with large amplitude, short duration perturbations allowing rapid, highly reliable triggering, with reduced braking of toroidal rotation. The rapid triggering allowed the ELM frequency to be increased to over 60 Hz, leading to a reduction in the average ELM size. Combined with improved gas fuelling, this method has resulted in periods of stationary global conditions, although plasma profiles do continue to evolve.",

author = "Canik, {J. M.} and Sontag, {A. C.} and R. Maingi and R. Bell and Gates, {D. A.} and Gerhardt, {S. P.} and Kugel, {H. W.} and Leblanc, {B. P.} and J. Menard and S. Paul and S. Sabbagh and Soukhanovskii, {V. A.}",

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doi = "10.1088/0029-5515/50/6/064016",

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T1 - Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

AU - Canik, J. M.

AU - Sontag, A. C.

AU - Maingi, R.

AU - Bell, R.

AU - Gates, D. A.

AU - Gerhardt, S. P.

AU - Kugel, H. W.

AU - Leblanc, B. P.

AU - Menard, J.

AU - Paul, S.

AU - Sabbagh, S.

AU - Soukhanovskii, V. A.

PY - 2010

Y1 - 2010

N2 - The application of non-axisymmetric magnetic perturbations has been shown to destabilize edge-localized modes (ELMs) in the National Spherical Torus Experiment. This ELM-triggering effect is used to controllably introduce ELMs into lithium-enhanced ELM-free H-mode discharges, reducing the typical impurity accumulation while maintaining high energy confinement. Recent improvements to the triggering techniques are described. The perturbation waveform has been improved, with large amplitude, short duration perturbations allowing rapid, highly reliable triggering, with reduced braking of toroidal rotation. The rapid triggering allowed the ELM frequency to be increased to over 60 Hz, leading to a reduction in the average ELM size. Combined with improved gas fuelling, this method has resulted in periods of stationary global conditions, although plasma profiles do continue to evolve.

AB - The application of non-axisymmetric magnetic perturbations has been shown to destabilize edge-localized modes (ELMs) in the National Spherical Torus Experiment. This ELM-triggering effect is used to controllably introduce ELMs into lithium-enhanced ELM-free H-mode discharges, reducing the typical impurity accumulation while maintaining high energy confinement. Recent improvements to the triggering techniques are described. The perturbation waveform has been improved, with large amplitude, short duration perturbations allowing rapid, highly reliable triggering, with reduced braking of toroidal rotation. The rapid triggering allowed the ELM frequency to be increased to over 60 Hz, leading to a reduction in the average ELM size. Combined with improved gas fuelling, this method has resulted in periods of stationary global conditions, although plasma profiles do continue to evolve.

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JO - Nuclear Fusion

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Progress in the development of ELM pace-making with non-axisymmetric magnetic perturbations in NSTX

Abstract

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