Study of gams and related turbulent particle flux with hibp in the T-10 tokamak

• Дата: 2017
• Автори: Eliseev, L.G., Lysenko, S.E., Melnikov, A.V., Krupnik, L.I., Kozachek, A.S., Zenin, V.N.
• Формат: Стаття
• Мова: English
• Опубліковано: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2017
• Назва видання: Вопросы атомной науки и техники
• Теми: Диагностика плазмы
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/122174
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Study of gams and related turbulent particle flux with hibp in the T-10 tokamak / L.G. Eliseev, S.E. Lysenko, A.V. Melnikov, L.I. Krupnik, A.S. Kozachek, V.N. Zenin // Вопросы атомной науки и техники. — 2017. — № 1. — С. 241-243. — Бібліогр.: 9 назв. — англ.

The new findings in the behavior of geodesic acoustic modes (GAMs) and turbulent particle flux dynamics on the T-10 tokamak are presented. For the first time in T-10 the broadband oscillations (<250 kHz) of electric potential and density in Ohmic and ECRH regimes (Bt = 1.6…2.4 T, Ipl = 0.15…0.3 MA, n‾e = (0.6…5)×10¹⁹ m⁻³) were measured by Heavy Ion Beam Probe (HIBP) in the core plasmas. At the periphery, at r/a > 0.8, the dominated GAM peak with frequency ~ 14 kHz and noticeable peak of quasi-coherent oscillations in the frequency band 40…100 kHz were observed. The multichannel HIBP measurements were performed to measure poloidal electric field Epol and to retrieve the electrostatic turbulent radial particle flux driven by E×B drift. The preliminary experiment shows that in contrast to the power spectral density of plasma potentials, GAM peak was almost invisible in the Epol power spectrum and on the frequency resolved turbulent particle flux. These results are consistent with the general concept of GAM as a high-frequency branch of zonal flows, having symmetric poloidal structure of potential perturbation, which were supported by earlier observation of poloidal mode number m=0 in T-10.