Demonstration of the Technique of Central Lower Hybrid Heating of High-Density Plasma at the FT-2 Tokamak
Lashkul S.I.1, Altukhov A. B.1, Gurchenko A. D.1, Gusakov E. Z.1, D’yachenko V. V.1, Esipov L. A.1, Konovalov A. N.1, Kuprienko D. V.1, Mironov M. I.1, Chernyshev F. V.1, Shatalin S. V.1, Stepanov A. Yu.1
1Ioffe Institute, St. Petersburg, Russia
Email: Serguey.Lashkul@mail.ioffe.ru, AlexeyAltukhovA.Altuhov@mail.ioffe.ru, Aleksey.Gurchenko@mail.ioffe.ru, denis.kouprienko@mail.ioffe.ru
The method of central low-hybrid heating of the ion component of dense tokamak plasma based on theoretical concepts has been experimentally demonstrated. The experiments were performed on the FT-2 tokamak, a compact tokamak with a large aspect ratio and a strong toroidal magnetic field BT≤ 3.5 (large toroidal radius R=0.55 m, small a=0.08 m). The maximum increase in ion temperature from Ti(0)=200 to 500-600 eV as a result of additional central low-hybrid heating (f0=920 MHz, PRF=100 kW) was obtained in deuterium plasma at a reduced the value of BT=1.7-1.9 T Keywords: HF ion heating, modeling, RF wave longitudinal slowdown spectrum, diagnostics of plasma ion temperature.
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