A dual heavy ion beam probe diagnostic on the TJ-II stellarator

• Date: 2019
• Main Authors: Chmyga, O.O., Ascasibar, E., Barcala, J., Drabinskiy, M.A., Eliseev, L.G., Hidalgo, C., Khabanov, P.O., Khrebtov, S.M., Komarov, O.D., Kozachok, O.S., Krupnik, L.I., Lysenko, S.E., Melnikov, A.V., Molinero, A., Pablos, J.L.de, Perfilov, S.V., Zenin, V.N., TJ-II Team
• Format: Article
• Language: English
• Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2019
• Series: Вопросы атомной науки и техники
• Subjects: Plasma diagnostics
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/194903
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: A dual heavy ion beam probe diagnostic on the TJ-II stellarator / O.O. Chmyga, E. Ascasibar, J. Barcala, M.A. Drabinskiy, L.G. Eliseev, C. Hidalgo, P.O. Khabanov, S.M. Khrebtov, O.D. Komarov, O.S. Kozachok, L.I. Krupnik, S.E. Lysenko, A.V. Melnikov, A. Molinero, J.L.de Pablos, S.V. Perfilov, V.N. Zenin, TJ-II Team // Problems of atomic science and technology. — 2019. — № 1. — С. 248-251. — Бібліогр.: 12 назв. — англ.

The aim of the report is to show the development of HIBP diagnostics on the TJ-II stellarator and, as a result, the expansion of the range of plasma parameters measurements. The first Heavy Ion Beam Probe (HIBP-1) diagnostic is being used on TJ-II stellarator since 2000. It has been shown significant progress in the measurements of plasma profiles and oscillations. The second HIBP-2 system was installed on TJ-II in 2012. Dual HIBP system, consisting of two identical HIBP-1 and HIBP-2 located ¼ torus apart, provides the measurement of the long-range correlations of plasma parameters in the full plasma column. Low noise high gain (10⁷ V/A) preamplifiers with 1 Hz bandwidth sampling is used. They allow to study broadband turbulence and quasi-coherent modes like geodesic acoustic modes, Alfven eigenmodes, suprathermal electron induced modes, etc. New capabilities of the dual HIBP diagnostic in plasma potential and density investigations were demonstrated on TJ-II stellarator in the measurements of the correlation between fluctuations in different poloidal and toroidal locations: on the same field line, on the same magnetic surface or on different magnetic surfaces at different points, separated toroidally and/or poloidally.