Impact of triangularity on edge peeling–ballooning modes in H-mode plasmas
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DOI: 10.1063/5.0174192
Abstract: Triangularity is an important shaping parameter in tokamak plasmas that affects the edge plasma state. In this work, we utilize the BOUT++ code to study the effect of positive and negative triangularity on the peeling–ballooning… read more here.
Keywords: negative triangularity; ballooning modes; modes mode; peeling ballooning ... See more keywords
Electromagnetic instability and turbulence in plasmas with positive and negative triangularity
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DOI: 10.1063/5.0255557
Abstract: While a number of studies exist comparing positive triangularity (PT) and negative triangularity (NT) δ, the nature of how the normalized electron pressure β affects microinstabilities and turbulence in fusion devices with substantial δ has… read more here.
Keywords: negative triangularity; turbulence; instability turbulence; electromagnetic instability ... See more keywords
Alfvén mode spectrum in the advanced steady-state tokamak scenario with negative triangularity
Sign Up to like & getrecommendations! Published in 2025 at "Physics of Plasmas"
DOI: 10.1063/5.0281831
Abstract: In the earlier studies [Zheng et al. Fundam. Plasma Phys. 10, 100051 (2024)], the negative triangularity tokamak was shown to have a unique and outstanding feature for the steady-state confinement. In addition to relieving the… read more here.
Keywords: negative triangularity; steady state; triangularity; scenario negative ... See more keywords
Pedestal properties of H-modes with negative triangularity using the EPED-CH model
Sign Up to like & getrecommendations! Published in 2017 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/aa7ac0
Abstract: The EPED model has been designed to predict the pedestal height and width from a minimal set of parameters and using the stability of the pedestal region for global MHD peeling-ballooning (P-B) modes as well… read more here.
Keywords: stability; triangularity; model; negative triangularity ... See more keywords
Assessment of vertical stability for negative triangularity pilot plants
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DOI: 10.1088/1361-6587/ad4175
Abstract: Negative triangularity (NT) tokamak configurations may be more susceptible to magneto-hydrodynamic instability, posing challenges for recent reactor designs centered around their favorable properties, such as improved confinement and operation free of edge-localized modes. In this… read more here.
Keywords: negative triangularity; assessment vertical; stability; stability negative ... See more keywords
Plasma edge and scrape-off layer turbulence in gyrokinetic simulations of negative triangularity plasmas
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DOI: 10.1088/1361-6587/ad8186
Abstract: Gyrokinetic simulations in the long-wavelength or drift-kinetic limit are carried out of DIII-D inner-wall-limited (IWL) plasmas to investigate the effect of triangularity on edge and scrape-off layer (SOL) turbulence. The effect of neutral interactions and… read more here.
Keywords: negative triangularity; edge scrape; plasmas; gyrokinetic simulations ... See more keywords
First observations of edge instabilities in strongly shaped negative triangularity plasmas on DIII-D
Sign Up to like & getrecommendations! Published in 2025 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/adb5ba
Abstract: Throughout the 2023 DIII-D negative triangularity (NT) campaign, unexpected magnetic fluctuations indicative of an edge localized instability were observed in the majority of strongly shaped ( −0.55⩽δ⩽−0.45) discharges. Moreover, these same fluctuations were found to… read more here.
Keywords: negative triangularity; plasmas; edge; strongly shaped ... See more keywords
Operation above the Greenwald density limit in high performance DIII-D negative triangularity discharges
Sign Up to like & getrecommendations! Published in 2025 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/ade185
Abstract: The density limit in strongly-shaped negative triangularity (NT) discharges is studied experimentally in the DIII-D tokamak. Record-high Greenwald fractions fG are obtained, using gas puff injection only, with values up to near 2, where fG… read more here.
Keywords: triangularity discharges; negative triangularity; limit; greenwald density ... See more keywords
The effect of triangularity on fluctuations in a tokamak plasma
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DOI: 10.1088/1741-4326/aa98f4
Abstract: The effects of plasma shaping, in particular triangularity (δ), on temperature fluctuations in the tokamak a configuration variable have been studied using the correlation electron cyclotron emission system. It has been found that, in ohmic… read more here.
Keywords: tokamak plasma; fluctuations tokamak; triangularity fluctuations; triangularity ... See more keywords
Suppression of first-wall interaction in negative triangularity plasmas on TCV
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DOI: 10.1088/1741-4326/abdb95
Abstract: Magnetically confined fusion plasmas with negative triangularity (δ) exhibit greater L-mode confinement than with positive δ. Recent experiments in the TCV and DIII-D tokamaks have correlated the confinement improvement to a reduction of fluctuations within… read more here.
Keywords: plasmas; suppression; first wall; interaction ... See more keywords
Infernal instabilities in negative-triangularity plasmas with negative central shear
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DOI: 10.1088/1741-4326/adac78
Abstract: A systematic numerical investigation is carried out to understand magnetohydrodynamic stability of the ideal infernal-kink instability in tokamak plasmas with both negative triangularity (neg-D) shaping and negative central shear for the equilibrium safety factor profile.… read more here.
Keywords: negative triangularity; plasmas negative; negative central; infernal instabilities ... See more keywords