H-mode grade confinement in L-mode edge plasmas at negative triangularity on DIII-D

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Plasmas with a negative triangularity shape have been created on the DIII-D tokamak that, despite maintaining standard L-mode edge radial profiles, reach volume averaged pressure levels typical of H-mode scenarios. Within the auxiliary power available for these experiments, plasmas exhibit near-zero power degradation while sustaining beta(N) = 2.7 and H-98,H-y2 = 1.2 for several energy confinement times. Detailed comparison with matched discharges at positive triangularity indicates that Trapped Electron Modes are weakened at negative triangularity, consistent with increased confinement and reduced intensity of fluctuations in electron density, electron temperature, and ion density. These results indicate that a negative triangularity plasma operating without an edge pedestal might provide an attractive scenario for operations in future reactors. Published under license by AIP Publishing.
Publisher
AMER INST PHYSICS
Issue Date
2019-04
Language
English
Article Type
Article; Proceedings Paper
Citation

PHYSICS OF PLASMAS, v.26, no.4

ISSN
1070-664X
DOI
10.1063/1.5091802
URI
http://hdl.handle.net/10203/272651
Appears in Collection
NE-Journal Papers(저널논문)
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