Determination of Filament Parameters on the Spherical Tokamak Globus-M2 Using Doppler Backscattering

Determination of Filament Parameters on the Spherical Tokamak Globus-M2 Using Doppler Backscattering

In high confinement mode (H-mode) in the tokamak Globus-M2, the development of edge-localized modes (ELMs) is accompanied by the appearance of filament structures. Using the Doppler backscattering method allowed to determine the parameters of the filaments during ELMs triggered by and independent fr...

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Bibliographic Details
Published in:Technical physics letters Vol. 49; no. Suppl 3; pp. S239 - S242
Main Authors: Yashin, A. Y., Ponomarenko, A. M., Zhlitsov, N. S., Kukushkin, K. A., Kurskiev, G. S., Minaev, V. B., Petrov, A. V., Petrov, Yu. V., Sakharov, N. V.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-12-2023
Springer Nature B.V
Subjects:
Backscattering
Classical and Continuum Physics
Filaments
Parameters
Physics
Physics and Astronomy
Tokamak devices
tokamak
high temperature plasma
filaments
Doppler backscattering
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Summary:In high confinement mode (H-mode) in the tokamak Globus-M2, the development of edge-localized modes (ELMs) is accompanied by the appearance of filament structures. Using the Doppler backscattering method allowed to determine the parameters of the filaments during ELMs triggered by and independent from saw-tooth crashes. It was shown that the number of filaments observed during ELMs synchronized with saw-tooth crashes is greater and the area of their observation is wider. The filament velocity during all observed ELM types on Globus-M2 is higher than was the case on the Globus-M tokamak. Filaments that developed immediately before an ELM burst are characterized by smaller amplitudes and velocities. Two diagnostics, Doppler backscattering and poloidal correlation Doppler reflectometry, were used to determine the poloidal velocity of such filaments and the results demonstrated that the velocity values obtained had similar values, which may indicate linear backscattering taking place off these filaments.
ISSN:1063-7850
1090-6533
DOI:10.1134/S1063785023900893