Abstract
In experiments with lower hybrid current drive (LHCD) on the FT-2 tokamak, lower hybrid (LH) waves have been successfully used for the first time to ensure effective additional heating of plasma electrons from 450 to 600 eV (I Pl = 32 kA, Δt RF = 14 ms, P RF = 100 kW, F = 920 MHz). Several factors influencing the efficiency of plasma heating have been discovered. In particular, significant growth of radiation losses in the LHCD regime has been found, which is probably related to an increase in the intensity of synchrotron radiation from accelerated electrons. The increase in this intensity in the 53–156 GHz frequency range was accompanied by short spikes of microwave radiation, which were observed only in a narrower frequency range (53–78 GHz) and apparently resulted from interaction of a runaway electron beam with significant local mirrors of toroidal magnetic field. A model of the additional heating of plasma electrons due to absorption of the microwave radiation generated by a beam of accelerated electrons is proposed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
S. I. Lashkul, A. B. Altukhov, A. D. Gurchenko, et al., Plazma Phys. Rep. 36, 751 (2010).
B. Kurzan, K.-H. Steuer, and W. Suttrop, Rev. Sci. Instrum. 68, 423 (1997).
B. Kurzan and K.-H. Steuer, Phys. Rev. E 55, 4608 (1994).
Z. Y. Chen, B. N. Wan, S. Y. Lin, et al., Proceedings of the 21st IAEA Fusion Energy Conf. (October 16–21, 2006, Chengdu, China), EX, pp. 3–4.
V. N. Budnikov, V. N. Kiptilyi, V. V. Rozhdestvenskii, et al., Proceedings of the 25th EPS Conf. (Praha, 1998), p. 1360.
V. E. Golant and V. Fedorov, Nethods of High-Frequency Plasma Heating in Toriodal Thermonuclear Fusion Setups (Moscow, 1968), Ch. 3 [in Russian].
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © S.I. Lashkul, V.V. Rozhdestvensky, A.B. Altukhov, V.V. Dyachenko, L.A. Esipov, M.Yu. Kantor, S.V. Krikunov, D.V. Kuprienko, A.Yu. Stepanov, 2012, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2012, Vol. 38, No. 23, pp. 69–76.
Rights and permissions
About this article
Cite this article
Lashkul, S.I., Rozhdestvensky, V.V., Altukhov, A.B. et al. Features of accelerated electron beam formation in LHCD experiments on FT-2 tokamak. Tech. Phys. Lett. 38, 1073–1076 (2012). https://doi.org/10.1134/S1063785012120061
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1063785012120061