Number of the records: 1  

Simultaneous DC measurements of ion current density and electron temperature using a tunnel probe

  1. 1.
    SYSNO ASEP0468309
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeConference Paper
    TitleSimultaneous 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) RID
    Article number012018
    Source TitleJournal of Physics Conference Series, 700. - Bristol : IOP Publishing, Ltd., 2016 - ISSN 1742-6588
    Number of pages7 s.
    Publication formPrint - P
    ActionInternational Summer School on Vacuum, Electron and Ion Technologies (VEIT2015)/19./
    Event date21.09.2015 - 25.09.2015
    VEvent locationSozopol
    CountryBG - Bulgaria
    Event typeWRD
    Languageeng - English
    CountryGB - United Kingdom
    KeywordsLangmuir probe ; tokamak ; CASTOR
    Subject RIVBL - Plasma and Gas Discharge Physics
    OECD categoryFluids and plasma physics (including surface physics)
    Institutional supportUFP-V - RVO:61389021
    UT WOS000432421500018
    EID SCOPUS84964860662
    DOI10.1088/1742-6596/700/1/012018
    AnnotationThe 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.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2017
Number of the records: 1  

  This site uses cookies to make them easier to browse. Learn more about how we use cookies.