On the formation of edge electric fields in negative triangularity plasmas

the DIII-D negative triangularity team

doi:10.1088/1361-6587/ae0cfb

On the formation of edge electric fields in negative triangularity plasmas

the DIII-D negative triangularity team

PPPL Tokamak Expermntl Science

Research output: Contribution to journal › Article › peer-review

Abstract

The Negative Triangularity (NT) plasma edge is studied with full orbit simulations and compared with similar simulations using a Positive Triangularity (PT) edge geometry. It is found that the thermal edge ions in NT are less well confined than in PT. The edge ion losses in NT set-up an electric field inside the plasma in the loss region. This electric field leads to counter-current edge plasma flows and are consistent with observations in NT plasmas. It could also explain the good edge confinement in NT discharges via the E × B flow shear turbulence suppression mechanism.

Original language	English (US)
Article number	105010
Journal	Plasma Physics and Controlled Fusion
Volume	67
Issue number	10
DOIs	https://doi.org/10.1088/1361-6587/ae0cfb
State	Published - Oct 31 2025

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

Keywords

electric fields
negative triangularity
plasma edge
positive triangularity
tokamak

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10.1088/1361-6587/ae0cfb

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title = "On the formation of edge electric fields in negative triangularity plasmas",

abstract = "The Negative Triangularity (NT) plasma edge is studied with full orbit simulations and compared with similar simulations using a Positive Triangularity (PT) edge geometry. It is found that the thermal edge ions in NT are less well confined than in PT. The edge ion losses in NT set-up an electric field inside the plasma in the loss region. This electric field leads to counter-current edge plasma flows and are consistent with observations in NT plasmas. It could also explain the good edge confinement in NT discharges via the E × B flow shear turbulence suppression mechanism.",

keywords = "electric fields, negative triangularity, plasma edge, positive triangularity, tokamak",

author = "\{the DIII-D negative triangularity team\} and Kramer, \{G. J.\} and Nelson, \{A. O.\} and Thome, \{K. E.\}",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s). Published by IOP Publishing Ltd.",

year = "2025",

month = oct,

day = "31",

doi = "10.1088/1361-6587/ae0cfb",

language = "English (US)",

volume = "67",

journal = "Plasma Physics and Controlled Fusion",

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T1 - On the formation of edge electric fields in negative triangularity plasmas

AU - the DIII-D negative triangularity team

AU - Kramer, G. J.

AU - Nelson, A. O.

AU - Thome, K. E.

PY - 2025/10/31

Y1 - 2025/10/31

N2 - The Negative Triangularity (NT) plasma edge is studied with full orbit simulations and compared with similar simulations using a Positive Triangularity (PT) edge geometry. It is found that the thermal edge ions in NT are less well confined than in PT. The edge ion losses in NT set-up an electric field inside the plasma in the loss region. This electric field leads to counter-current edge plasma flows and are consistent with observations in NT plasmas. It could also explain the good edge confinement in NT discharges via the E × B flow shear turbulence suppression mechanism.

AB - The Negative Triangularity (NT) plasma edge is studied with full orbit simulations and compared with similar simulations using a Positive Triangularity (PT) edge geometry. It is found that the thermal edge ions in NT are less well confined than in PT. The edge ion losses in NT set-up an electric field inside the plasma in the loss region. This electric field leads to counter-current edge plasma flows and are consistent with observations in NT plasmas. It could also explain the good edge confinement in NT discharges via the E × B flow shear turbulence suppression mechanism.

KW - electric fields

KW - negative triangularity

KW - plasma edge

KW - positive triangularity

KW - tokamak

UR - https://www.scopus.com/pages/publications/105018304173

UR - https://www.scopus.com/pages/publications/105018304173#tab=citedBy

U2 - 10.1088/1361-6587/ae0cfb

DO - 10.1088/1361-6587/ae0cfb

M3 - Article

AN - SCOPUS:105018304173

SN - 0741-3335

VL - 67

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 10

M1 - 105010

ER -

On the formation of edge electric fields in negative triangularity plasmas

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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