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Survey of the edge radial electric field in L-mode TCV plasmas using Doppler backscattering
Laboratoire de Physique des Plasmas (LPP), CNRS, Sorbonne Université, École polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Laboratoire de Physique des Plasmas (LPP), CNRS, Sorbonne Université, École polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Laboratoire de Physique des Plasmas (LPP), CNRS, Sorbonne Université, École polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Laboratoire de Physique des Plasmas (LPP), CNRS, Sorbonne Université, École polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
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2025 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 67, no 6, article id 065003Article in journal (Refereed) Published
Abstract [en]

A Doppler backscattering (DBS) diagnostic has recently been installed on the Tokamak à Configuration Variable (TCV) to facilitate the study of edge turbulence and flow shear in a versatile experimental environment. The dual channel V-band DBS system is coupled to TCV’s quasi-optical diagnostic launcher, providing access to the upper low-field side region of the plasma cross-section. Verifications of the DBS measurements are presented. The DBS equilibrium v ⊥ profiles are found to compare favorably with gas puff imaging (GPI) measurements and to the E r inferred from the radial force balance of the carbon impurity. The radial structure of the edge E r × B equilibrium flow and its dependencies are investigated across a representative set of L-mode TCV discharges, by varying density, auxiliary heating and magnetic configuration.

Place, publisher, year, edition, pages
IOP Publishing , 2025. Vol. 67, no 6, article id 065003
Keywords [en]
Doppler backscattering, plasma edge, radial electric field, tokamak
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-364029DOI: 10.1088/1361-6587/add0e0ISI: 001489436200001Scopus ID: 2-s2.0-105005398923OAI: oai:DiVA.org:kth-364029DiVA, id: diva2:1962866
Note

QC 20250603

Available from: 2025-06-02 Created: 2025-06-02 Last updated: 2025-07-03Bibliographically approved

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Frassinetti, Lorenzo

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