Отправить статью по E-mail Transition into the improved core confinement mode as a possible mechanism for additional electron heating observed in the lower hybrid current drive experiments at the FT-2 tokamak
- Авторы: Altukhov A.B.1, Gurchenko A.D.1, Gusakov E.Z.1, Dyachenko V.V.1, Esipov L.A.1, Irzak M.A.1, Kantor M.Y.1, Kouprienko D.V.1, Perevalov A.A.2, Saveliev A.N.1, Stepanov A.Y.1, Shatalin S.V.2, Lashkul S.I.1
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Учреждения:
- Ioffe Institute
- St. Petersburg Politechnical University
- Выпуск: Том 43, № 7 (2017)
- Страницы: 711-719
- Раздел: Tokamaks
- URL: https://journals.rcsi.science/1063-780X/article/view/186121
- DOI: https://doi.org/10.1134/S1063780X1707008X
- ID: 186121
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Аннотация
In experiments on lower hybrid current drive (LHCD) carried out at the FT-2 tokamak, a substantial increase in the central electron temperature Te(r = 0 cm) from 550 to 700 eV was observed. A complex simulation procedure is used to explain a fairly high LHCD efficiency and the observed additional heating, which can be attributed to a transition into the improved core confinement (ICC) mode. For numerical simulations, data obtained in experiments with deuterium plasma at 〈ne〉 = 1.6 × 1019 m–3 were used. Simulations by the GRILL3D, FRTC, and ASTRA codes have shown that the increase in the density and central temperature is apparently caused by a significant suppression of heat transport in the electron component. The mechanism for transition into the improved confinement mode at r < 3 cm can be associated with the broadening of the plasma current channel due to the lower hybrid drive of the current carried by superthermal and runaway electrons. In this case, the magnetic shear s = (r/q)(dq/dr) in the axial region of the plasma column almost vanishes during the RF pulse. In this study, the effect of lower hybrid waves on the plasma parameters, resulting in a transition into the ICC mode, is considered. New experimental and calculated data are presented that evidence in favor of such a transition. Special attention is paid to the existence of a threshold for the transition into the ICC mode in deuterium plasma.
Об авторах
A. Altukhov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
A. Gurchenko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
E. Gusakov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
V. Dyachenko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
L. Esipov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
M. Irzak
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
M. Kantor
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
D. Kouprienko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
A. Perevalov
St. Petersburg Politechnical University
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 195251
A. Saveliev
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
A. Stepanov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
S. Shatalin
St. Petersburg Politechnical University
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 195251
S. Lashkul
Ioffe Institute
Автор, ответственный за переписку.
Email: Serguey.Lashkul@mail.ioffe.ru
Россия, St. Petersburg, 194021
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