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Title: Analysis of edge stability for models of heat flux width

Abstract

Detailed measurements of the n e, and T e, and T i profiles in the vicinity of the separatrix of ELMing H-mode discharges have been used to examine plasma stability at the extreme edge of the plasma and assess stability dependent models of the heat flux width. The results are strongly contrary to the critical gradient model, which posits that a ballooning instability determines a gradient scale length related to the heat flux width. The results of this analysis are not sensitive to the choice of location to evaluate stability. Significantly, it is also found that the results are completely consistent with the heuristic drift model for the heat flux width. Here the edge pressure gradient scales with plasma density and is proportional to the pressure gradient inferred from the equilibrium in accordance with the predictions of that theory.

Authors:
 [1];  [1];  [2];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1356713
Alternate Identifier(s):
OSTI ID: 1374811
Grant/Contract Number:  
FC02-04ER54698; AC52-07NA27344; AC02-09CH11466
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 12; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE

Citation Formats

Makowski, Michael A., Lasnier, Charles J., Leonard, Anthony W., and Osborne, Thomas H. Analysis of edge stability for models of heat flux width. United States: N. p., 2017. Web. doi:10.1016/j.nme.2017.04.008.
Makowski, Michael A., Lasnier, Charles J., Leonard, Anthony W., & Osborne, Thomas H. Analysis of edge stability for models of heat flux width. United States. doi:10.1016/j.nme.2017.04.008.
Makowski, Michael A., Lasnier, Charles J., Leonard, Anthony W., and Osborne, Thomas H. Fri . "Analysis of edge stability for models of heat flux width". United States. doi:10.1016/j.nme.2017.04.008.
@article{osti_1356713,
title = {Analysis of edge stability for models of heat flux width},
author = {Makowski, Michael A. and Lasnier, Charles J. and Leonard, Anthony W. and Osborne, Thomas H.},
abstractNote = {Detailed measurements of the ne, and Te, and Ti profiles in the vicinity of the separatrix of ELMing H-mode discharges have been used to examine plasma stability at the extreme edge of the plasma and assess stability dependent models of the heat flux width. The results are strongly contrary to the critical gradient model, which posits that a ballooning instability determines a gradient scale length related to the heat flux width. The results of this analysis are not sensitive to the choice of location to evaluate stability. Significantly, it is also found that the results are completely consistent with the heuristic drift model for the heat flux width. Here the edge pressure gradient scales with plasma density and is proportional to the pressure gradient inferred from the equilibrium in accordance with the predictions of that theory.},
doi = {10.1016/j.nme.2017.04.008},
journal = {Nuclear Materials and Energy},
number = ,
volume = 12,
place = {United States},
year = {Fri May 12 00:00:00 EDT 2017},
month = {Fri May 12 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nme.2017.04.008

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