Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak

the TCV team

doi:10.1088/1741-4326/ae19fd

Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak

the TCV team

Sorbonne Université
ENS Paris-Saclay
ENAC-IIC-GEL
General Atomics
Tuscia University

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

Abstract

We present the first edge E_r measurements in negative triangularity (NT) plasmas in the Tokamak à Configuration Variable (TCV). The Doppler backscattering measurements of v ⊥ ≈ E r / B reveal a significant impact of triangularity on the E_r well: in Ohmic, neutral beam injection, and electron cyclotron resonance heated discharges, the E_r well and associated E r × B shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode.

Original language	English
Article number	014002
Journal	Nuclear Fusion
Volume	66
Issue number	1
DOIs	https://doi.org/10.1088/1741-4326/ae19fd
Publication status	Published - 1 Jan 2026

Keywords

Doppler backscattering
negative triangularity
plasma edge
radial electric field
sheared flows
tokamak
turbulence

Access to Document

10.1088/1741-4326/ae19fd

Cite this

@article{5e2bbd8449fa4c4c8dce3867de935825,

title = "Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak",

abstract = "We present the first edge Er measurements in negative triangularity (NT) plasmas in the Tokamak {\`a} Configuration Variable (TCV). The Doppler backscattering measurements of v ⊥ ≈ E r / B reveal a significant impact of triangularity on the Er well: in Ohmic, neutral beam injection, and electron cyclotron resonance heated discharges, the Er well and associated E r × B shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode.",

keywords = "Doppler backscattering, negative triangularity, plasma edge, radial electric field, sheared flows, tokamak, turbulence",

author = "\{the TCV team\} and S. Rien{\"a}cker and P. Hennequin and L. Vermare and C. Honor{\'e} and R. Bouffet-Klein and S. Coda and B. Labit and B. Vincent and Thome, \{K. E.\} and O. Krutkin and A. Balestri and Y. Nakeva",

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

year = "2026",

month = jan,

day = "1",

doi = "10.1088/1741-4326/ae19fd",

language = "English",

volume = "66",

journal = "Nuclear Fusion",

issn = "0029-5515",

number = "1",

}

TY - JOUR

T1 - Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak

AU - the TCV team

AU - Rienäcker, S.

AU - Hennequin, P.

AU - Vermare, L.

AU - Honoré, C.

AU - Bouffet-Klein, R.

AU - Coda, S.

AU - Labit, B.

AU - Vincent, B.

AU - Thome, K. E.

AU - Krutkin, O.

AU - Balestri, A.

AU - Nakeva, Y.

PY - 2026/1/1

Y1 - 2026/1/1

N2 - We present the first edge Er measurements in negative triangularity (NT) plasmas in the Tokamak à Configuration Variable (TCV). The Doppler backscattering measurements of v ⊥ ≈ E r / B reveal a significant impact of triangularity on the Er well: in Ohmic, neutral beam injection, and electron cyclotron resonance heated discharges, the Er well and associated E r × B shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode.

AB - We present the first edge Er measurements in negative triangularity (NT) plasmas in the Tokamak à Configuration Variable (TCV). The Doppler backscattering measurements of v ⊥ ≈ E r / B reveal a significant impact of triangularity on the Er well: in Ohmic, neutral beam injection, and electron cyclotron resonance heated discharges, the Er well and associated E r × B shear are stronger in NT-shaped plasmas compared to their positive triangularity (PT) counterpart. This suggests a connection to the concomitant NT performance gain relative to PT L-mode.

KW - Doppler backscattering

KW - negative triangularity

KW - plasma edge

KW - radial electric field

KW - sheared flows

KW - tokamak

KW - turbulence

UR - https://www.scopus.com/pages/publications/105034158945

U2 - 10.1088/1741-4326/ae19fd

DO - 10.1088/1741-4326/ae19fd

M3 - Article

AN - SCOPUS:105034158945

SN - 0029-5515

VL - 66

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 1

M1 - 014002

ER -

Edge radial electric field in positive and negative triangularity plasmas in the TCV tokamak

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this