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- Title
Suppression of MHD Oscillations During Generation of Lower Hybrid Current Drive in the Plasma of FT-2 Tokamak.
- Authors
Lashkul, S. I.; Altukhov, A. B.; Gurchenko, A. D.; Gusakov, E. Z.; Dyachenko, V. D.; Esipov, L. A.; Kuprienko, D. V.; Shatalin, S. V.; Stepanov, A. Yu.
- Abstract
Results are presented of the study of the efficiency of generation of lower hybrid current drive in the plasma of FT-2 tokamak. Experimental data, including the data of the system of poloidally spaced Mirnov coils, was processed by specialized software to analyze the observed generation of lower hybrid current drive and suppression ("locking") of the m/n = 2/1 MHD tearing mode. Possible mechanisms responsible for the "locking" of the mode were considered, which are connected both with the broadening of the plasma current channel and with the decrease of its poloidal rotation speed Еr × ВT due to the development of the Parail‒Pogutse instability or additional toroidal rotation of the plasma column as a result of transmission of longitudinal pulse from the pumping wave to suprathermal electrons. It was noted that the end of lower hybrid current drive (LHCD) under conditions of increased microwave pulse duration (to ΔtRF ≈ 20 ms) is determined not by the end of the microwave pulse, but by the development of MHD tearing modes m/n = (3–4)/1 at the periphery of the discharge.
- Subjects
MAGNETOHYDRODYNAMIC instabilities; PLASMA currents; TOKAMAKS; PLASMA turbulence; PLASMA flow; OSCILLATIONS; TOROIDAL plasma
- Publication
Plasma Physics Reports, 2022, Vol 48, Issue 9, p913
- ISSN
1063-780X
- Publication type
Article
- DOI
10.1134/S1063780X22600566