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Effect of the resonant magnetic perturbation on the plasma parameters in COMPASS tokamak's divertor region

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    SYSNO ASEP0508655
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeConference Paper
    TitleEffect of the resonant magnetic perturbation on the plasma parameters in COMPASS tokamak's divertor region
    Author(s) Dimitrova, Miglena (UFP-V) ORCID
    Cahyna, Pavel (UFP-V) RID
    Peterka, Matěj (UFP-V) RID, ORCID
    Hasan, E. (BG)
    Popov, Tsv.K. (BG)
    Ivanova, P. (BG)
    Vasileva, E. (BG)
    Pánek, Radomír (UFP-V) RID
    Cavalier, Jordan (UFP-V) RID, ORCID
    Seidl, Jakub (UFP-V) RID
    Markovič, Tomáš (UFP-V) RID
    Havlíček, Josef (UFP-V) RID, ORCID
    Dejarnac, Renaud (UFP-V) RID, ORCID
    Weinzettl, Vladimír (UFP-V) RID, ORCID
    Háček, Pavel (UFP-V) RID, ORCID
    Tomeš, Matěj (UFP-V)
    Number of authors16
    Article number012001
    Source TitleJournal of Physics: Conference Series, FAIRNESS 2016, 742. - Bristol : IOP Publishing, 2016 - ISSN 1742-6588
    Pagesroč. 982, č. 1 (2018)
    Number of pages6 s.
    Publication formOnline - E
    Action7th International Workshop and Summer School on Plasma Physics
    Event date26.06.2016 - 02.07.2016
    VEvent locationKiten
    CountryBG - Bulgaria
    Event typeWRD
    Languageeng - English
    CountryGB - United Kingdom
    Keywordstokamak ; COMPASS ; divertor
    Subject RIVBL - Plasma and Gas Discharge Physics
    OBOR OECDFluids and plasma physics (including surface physics)
    R&D ProjectsLM2015045 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    8D15001 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    GA16-24724S GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
    Institutional supportUFP-V - RVO:61389021
    UT WOS000454714800001
    EID SCOPUS85045621844
    AnnotationThe resonant magnetic perturbation (RMP) has proven to be a useful way to suppress edge-localized modes that under certain conditions can damage the device by the large power fluxes carried from the bulk plasma to the wall. The effect of RMP on the L-mode plasma parameters in the divertor region of the COMPASS tokamak was studied using the array of 39 Langmuir probes embedded into the divertor target. The current-voltage (IV) probe characteristics were processed by the first-derivative probe technique to obtain the plasma potential and the electron energy distribution function (EEDF) which was approximated by a bi-Maxwellian EEDF with a low-energy (4-6 eV) fraction and a high-energy (11-35 eV) one, the both factions having similar electron density. Clear splitting was observed during the RMP pulse in the low-field-side scrape-off-layer profiles of the floating potential U fl and the ion saturation current density J sat - these two quantities were obtained both by direct continuous measurement and by evaluation of the IV characteristics of probes with swept bias. The negative peaks of U fl induced by RMP spatially overlaps with the local minima of J sat (and n e) rather than with its local maxima which is partly caused by the spatial variation of the plasma potential and partly by the changed shape of the EEDF. The effective temperature of the whole EEDF is not correlated with the negative peaks of U fl, and the profile of the parallel power flux density shows secondary maxima due to RMP which mimic those of J sat.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza,, Tel.: 266 052 975
    Year of Publishing2020
    Electronic address
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