Recent measurements of the electric potential profile and fluctuations in ECRH and NBI plasmas on TJ-II stellarator

Recent measurements of the electric potential profile and fluctuations in ECRH and NBI plasmas on TJ-II stellarator

Heavy Ion Beam Probe diagnostics is used in TJ-II stellarator to study directly the plasma electric potential with a good spatial (up to 1cm) and temporal (up to 2 µs ) resolution. Low density (ne = (0.3…0.5)×1019 m –3) ECRH plasma in TJ-II is characterized by positive plasma potential (ϕ(0) = +6...

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Date:2009
Main Authors: Krupnik, L.I., Melnikov, A.V., Hidalgo, C., Eliseev, L.G., Chmyga, A.A., Komarov, A.D., Kozachok, A.S., Perfilov, S.V., Lysenko, L.G., Zhezhera, A.I., Pedrosa, M.A., de Pablos, J.L.
Format: Article
Language:English
Published: Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2009
Series:Вопросы атомной науки и техники
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Магнитное удержание
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/88171
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Journal Title:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this:Recent measurements of the electric potential profile and fluctuations in ECRH and NBI plasmas on TJ-II stellarator / L.I. Krupnik, A.V. Melnikov, C. Hidalgo, L.G. Eliseev, A.A. Chmyga, A.D. Komarov, A.S. Kozachok, S.V. Perfilov, L.G. Lysenko, A.I. Zhezhera, M.A. Pedrosa, J.L. de Pablos // Вопросы атомной науки и техники. — 2009. — № 1. — С. 31-33. — Бібліогр.: 2 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Summary:Heavy Ion Beam Probe diagnostics is used in TJ-II stellarator to study directly the plasma electric potential with a good spatial (up to 1cm) and temporal (up to 2 µs ) resolution. Low density (ne = (0.3…0.5)×1019 m –3) ECRH plasma in TJ-II is characterized by positive plasma potential (ϕ(0) = +600…+ 400 V). At higher densities the minor area of the negative electric potential appears at the edge. This area increases with the density, finally makes potential fully negative. This tendency is affected by ECRH power and deposition area. The NBI plasmas are characterized by negative electric potential in the full plasma column from the center to the edge, (ϕ(0) = -300…-600 V). These results show the clear link between plasma potential, temperature, density and particle confinement.

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