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Zhurnal Tekhnicheskoi Fiziki, 2023, Volume 93, Issue 5, Pages 629–636
DOI: https://doi.org/10.21883/JTF.2023.05.55457.291-22 (Mi jtf6989) 		 
Plasma

The lower hybrid frequency range wave emission in the ohmic discharge of the FT-2 tokamak

V. V. D'yachenko, A. B. Altukhov, A. D. Gurchenko, E. Z. Gusakov, L. A. Esipov, A. N. Konovalov, S. I. Lashkul, A. Yu. Popov

Ioffe Institute, St. Petersburg, Russia
Full-text PDF (1122 kB)
DOI: https://doi.org/10.21883/JTF.2023.05.55457.291-22
Abstract: The paper presents observations of plasma intermediate frequency range wave emission ((200–1000) MHz) performed in ohmic discharge of the FT-2 tokamak. The dependencies of the RF signal amplitude and spectrum on the plasma parameters and on the location of the probes are presented. Two possible explanations for this effect is proposed. One of them is related to the distortion of the electron distribution function due to the strong ripple of the magnetic field in the FT-2 tokamak. Second one is related to the existence of a beam of run-away electrons, the buildup of a fan instability responsible for the generation of synchrotron radiation in the range (10–80) GHz, and a complex chain of nonlinear decay instabilities leading to such a strong decrease in the frequency of the observed oscillations.
Keywords: tokamak, lower hybrid current drive, high frequency oscillations, parametric decay instabilities.
Funding agency Grant number
Ministry of Science and Higher Education of the Russian Federation 0040-2019-0023
0034-2021-0002
0034-2021-0001
FT-2 tokamak was operated and basic diagnostics was carried out with the support of the state contract FTI 0040-2019-0023. High-frequency measurements were performed with the support of the state contract FTI 0034-2021-0002, and their correlation analysis was supported by the state contract FTI 0034-2021-0001.
Received: 27.12.2022
Revised: 28.02.2023
Accepted: 16.03.2023
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: V. V. D'yachenko, A. B. Altukhov, A. D. Gurchenko, E. Z. Gusakov, L. A. Esipov, A. N. Konovalov, S. I. Lashkul, A. Yu. Popov, “The lower hybrid frequency range wave emission in the ohmic discharge of the FT-2 tokamak”, Zhurnal Tekhnicheskoi Fiziki, 93:5 (2023), 629–636
Citation in format AMSBIB
\Bibitem{DyaAltGur23}
\by V.~V.~D'yachenko, A.~B.~Altukhov, A.~D.~Gurchenko, E.~Z.~Gusakov, L.~A.~Esipov, A.~N.~Konovalov, S.~I.~Lashkul, A.~Yu.~Popov
\paper The lower hybrid frequency range wave emission in the ohmic discharge of the FT-2 tokamak
\jour Zhurnal Tekhnicheskoi Fiziki
\yr 2023
\vol 93
\issue 5
\pages 629--636
\mathnet{http://mi.mathnet.ru/jtf6989}
\crossref{https://doi.org/10.21883/JTF.2023.05.55457.291-22}
\elib{https://elibrary.ru/item.asp?id=53934420}
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