Survey of the edge radial electric field in L-mode TCV plasmas using Doppler backscatteringShow others and affiliations
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
2025-06-022025-06-022025-07-03Bibliographically approved