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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 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Simultaneous DC measurements of ion current density and electron temperature using a tunnel probe Tvůrce(i) Gunn, J. P. (FR)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RIDČíslo článku 012018 Zdroj.dok. Journal of Physics Conference Series, 700. - Bristol : IOP Publishing, Ltd., 2016 - ISSN 1742-6588 Poč.str. 7 s. Forma vydání Tištěná - P Akce International Summer School on Vacuum, Electron and Ion Technologies (VEIT2015)/19./ Datum konání 21.09.2015 - 25.09.2015 Místo konání Sozopol Země BG - Bulharsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Langmuir probe ; tokamak ; CASTOR Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) Institucionální podpora UFP-V - RVO:61389021 UT WOS 000432421500018 EID SCOPUS 84964860662 DOI 10.1088/1742-6596/700/1/012018 Anotace 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. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
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