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Title: ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX

Abstract

A new n=1 dominated Edge Harmonic Oscillation (EHO) has been found in NSTX. The new EHO, rotating toroidally in the counter-current direction and the opposite direction of the neutral beam, was observed during certain inter-ELM and ELM-free periods of H-mode operation. This EHO is associated with a significant broadening of the integral heat flux width (?_int) by up to 150%, and a decrease in the divertor peak heat flux by >60%. An EHO induced filament was also observed by the gas puff imaging diagnostic. The toroidal rotating filaments could change the edge magnetic topology resulting in toroidal rotating strike point splitting and heat flux broadening. Experimental result of the counter current rotation of strike points splitting is consistent with the counter-current EHO.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
DOE Contract Number:  
AC02-09CH11466
Product Type:
Dataset
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
U. S. Department of Energy
Keywords:
Divertor heat flux width
OSTI Identifier:
1562042
DOI:
10.11578/1562042

Citation Formats

Gan, K, Ahn, J -W, Gray, T K, Zweben, S J, Fredrickson, E D, Scotti, F, Maingi, R, Park, J -K, Canal, G P, Soukhanovskii, V A, McLean, A G, and Wirth, B D. ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX. United States: N. p., 2017. Web. doi:10.11578/1562042.
Gan, K, Ahn, J -W, Gray, T K, Zweben, S J, Fredrickson, E D, Scotti, F, Maingi, R, Park, J -K, Canal, G P, Soukhanovskii, V A, McLean, A G, & Wirth, B D. ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX. United States. doi:10.11578/1562042.
Gan, K, Ahn, J -W, Gray, T K, Zweben, S J, Fredrickson, E D, Scotti, F, Maingi, R, Park, J -K, Canal, G P, Soukhanovskii, V A, McLean, A G, and Wirth, B D. 2017. "ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX". United States. doi:10.11578/1562042. https://www.osti.gov/servlets/purl/1562042. Pub date:Fri Dec 01 00:00:00 EST 2017
@article{osti_1562042,
title = {ELM-free and inter-ELM divertor heat flux broadening induced by Edge Harmonics Oscillation in NSTX},
author = {Gan, K and Ahn, J -W and Gray, T K and Zweben, S J and Fredrickson, E D and Scotti, F and Maingi, R and Park, J -K and Canal, G P and Soukhanovskii, V A and McLean, A G and Wirth, B D},
abstractNote = {A new n=1 dominated Edge Harmonic Oscillation (EHO) has been found in NSTX. The new EHO, rotating toroidally in the counter-current direction and the opposite direction of the neutral beam, was observed during certain inter-ELM and ELM-free periods of H-mode operation. This EHO is associated with a significant broadening of the integral heat flux width (?_int) by up to 150%, and a decrease in the divertor peak heat flux by >60%. An EHO induced filament was also observed by the gas puff imaging diagnostic. The toroidal rotating filaments could change the edge magnetic topology resulting in toroidal rotating strike point splitting and heat flux broadening. Experimental result of the counter current rotation of strike points splitting is consistent with the counter-current EHO.},
doi = {10.11578/1562042},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {12}
}

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