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
- Авторлар: 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
-
Мекемелер:
- Ioffe Institute
- St. Petersburg Politechnical University
- Шығарылым: Том 43, № 7 (2017)
- Беттер: 711-719
- Бөлім: Tokamaks
- URL: https://journals.rcsi.science/1063-780X/article/view/186121
- DOI: https://doi.org/10.1134/S1063780X1707008X
- ID: 186121
Дәйексөз келтіру
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.
Авторлар туралы
A. Altukhov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
A. Gurchenko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
E. Gusakov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
V. Dyachenko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
L. Esipov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
M. Irzak
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
M. Kantor
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
D. Kouprienko
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
A. Perevalov
St. Petersburg Politechnical University
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 195251
A. Saveliev
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
A. Stepanov
Ioffe Institute
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
S. Shatalin
St. Petersburg Politechnical University
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 195251
S. Lashkul
Ioffe Institute
Хат алмасуға жауапты Автор.
Email: Serguey.Lashkul@mail.ioffe.ru
Ресей, St. Petersburg, 194021
Қосымша файлдар
