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Simultaneous DC measurements of ion current density and electron temperature using a tunnel probe
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SYSNO ASEP 0468309 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Simultaneous DC measurements of ion current density and electron temperature using a tunnel probe Author(s) Gunn, J. P. (FR)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RIDArticle number 012018 Source Title Journal of Physics Conference Series, 700. - Bristol : IOP Publishing, Ltd., 2016 - ISSN 1742-6588 Number of pages 7 s. Publication form Print - P Action International Summer School on Vacuum, Electron and Ion Technologies (VEIT2015)/19./ Event date 21.09.2015 - 25.09.2015 VEvent location Sozopol Country BG - Bulgaria Event type WRD Language eng - English Country GB - United Kingdom Keywords Langmuir probe ; tokamak ; CASTOR Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Institutional support UFP-V - RVO:61389021 UT WOS 000432421500018 EID SCOPUS 84964860662 DOI 10.1088/1742-6596/700/1/012018 Annotation The tunnel probe is a concave Langmuir probe designed to operate in strongly magnetized plasma. Due to its shape, the tunnel probe is immune to sheath expansion effects and thus provides absolutely calibrated measurements of the parallel ion current density. A two-dimensional, self-consistent kinetic model is employed to model the flow of charges within the cavity of the tunnel probe. The calculation predicts that the distribution of the ion flux onto the inner conductors depends on the electric field inside the tunnel, which in turn depends on the electron temperature. Therefore, if the tunnel is divided into two negatively biased collectors, it is possible to use the simulation results to determine the electron temperature from the measured ion current ratio. This means that a DC-biased tunnel probe can be used to provide fast, simultaneous measurements of the parallel ion current density and the electron temperature without collecting a single electron. Measurements in the CASTOR and Tore Supra tokamaks agree well with the numerical simulations. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
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