Impact of edge harmonic oscillations on the divertor heat flux in NSTX

K. F. Gan; T. K. Gray; S. J. Zweben; E. D. Fredrickson; R. Maingi; D. J. Battaglia; A. G. McLean; B. D. Wirth

doi:10.1063/5.0069701

Impact of edge harmonic oscillations on the divertor heat flux in NSTX

K. F. Gan, T. K. Gray, S. J. Zweben, E. D. Fredrickson, R. Maingi, D. J. Battaglia, A. G. McLean, B. D. Wirth

Power Exhaust and Particle Control

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Abstract

Previously, edge-localized mode (ELM)-free and inter-ELM divertor peak heat flux reduction induced by an edge harmonic oscillation (EHO) was observed in NSTX [Gan et al., Nucl. Fusion 57, 126053 (2017)]. This paper introduces new analysis of the EHO impact on the divertor heat flux. It was found that enhanced edge turbulence significantly altered the divertor heat flux footprint in NSTX H-modes, relative to ELM-free discharges. When the background edge fluctuation level was low, the EHO significantly increased the heat flux width and decreased the divertor peak heat flux. When the background edge fluctuation level was high, the EHO actually increased the divertor peak heat flux. Furthermore, it was also found that the heat flux width increased with the increasing frequency of the EHO.

Original language	English
Article number	012503
Journal	Physics of Plasmas
Volume	29
Issue number	1
DOIs	https://doi.org/10.1063/5.0069701
State	Published - Jan 1 2022

Funding

This work was supported by the U.S. DOE Contract No. DE-SC0016915.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1063/5.0069701

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title = "Impact of edge harmonic oscillations on the divertor heat flux in NSTX",

abstract = "Previously, edge-localized mode (ELM)-free and inter-ELM divertor peak heat flux reduction induced by an edge harmonic oscillation (EHO) was observed in NSTX [Gan et al., Nucl. Fusion 57, 126053 (2017)]. This paper introduces new analysis of the EHO impact on the divertor heat flux. It was found that enhanced edge turbulence significantly altered the divertor heat flux footprint in NSTX H-modes, relative to ELM-free discharges. When the background edge fluctuation level was low, the EHO significantly increased the heat flux width and decreased the divertor peak heat flux. When the background edge fluctuation level was high, the EHO actually increased the divertor peak heat flux. Furthermore, it was also found that the heat flux width increased with the increasing frequency of the EHO.",

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AU - Gan, K. F.

AU - Gray, T. K.

AU - Zweben, S. J.

AU - Fredrickson, E. D.

AU - Maingi, R.

AU - Battaglia, D. J.

AU - McLean, A. G.

AU - Wirth, B. D.

PY - 2022/1/1

Y1 - 2022/1/1

N2 - Previously, edge-localized mode (ELM)-free and inter-ELM divertor peak heat flux reduction induced by an edge harmonic oscillation (EHO) was observed in NSTX [Gan et al., Nucl. Fusion 57, 126053 (2017)]. This paper introduces new analysis of the EHO impact on the divertor heat flux. It was found that enhanced edge turbulence significantly altered the divertor heat flux footprint in NSTX H-modes, relative to ELM-free discharges. When the background edge fluctuation level was low, the EHO significantly increased the heat flux width and decreased the divertor peak heat flux. When the background edge fluctuation level was high, the EHO actually increased the divertor peak heat flux. Furthermore, it was also found that the heat flux width increased with the increasing frequency of the EHO.

AB - Previously, edge-localized mode (ELM)-free and inter-ELM divertor peak heat flux reduction induced by an edge harmonic oscillation (EHO) was observed in NSTX [Gan et al., Nucl. Fusion 57, 126053 (2017)]. This paper introduces new analysis of the EHO impact on the divertor heat flux. It was found that enhanced edge turbulence significantly altered the divertor heat flux footprint in NSTX H-modes, relative to ELM-free discharges. When the background edge fluctuation level was low, the EHO significantly increased the heat flux width and decreased the divertor peak heat flux. When the background edge fluctuation level was high, the EHO actually increased the divertor peak heat flux. Furthermore, it was also found that the heat flux width increased with the increasing frequency of the EHO.

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Impact of edge harmonic oscillations on the divertor heat flux in NSTX

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