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ELECTRON ENERGY DISTRIBUTION FUNCTION IN DIVERTOR REGION OF THE COMPASS TOKAMAK DURING NEUTRAL BEAM INJECTION HEATING (IWSSPP2016)

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    SYSNO ASEP0461459
    Document TypeO - Others
    R&D Document TypeOthers
    TitleELECTRON ENERGY DISTRIBUTION FUNCTION IN DIVERTOR REGION OF THE COMPASS TOKAMAK DURING NEUTRAL BEAM INJECTION HEATING (IWSSPP2016)
    Author(s) Hasan, E. (BG)
    Dimitrova, Miglena (UFP-V) ORCID
    Havlíček, Josef (UFP-V) RID, ORCID
    Bogár, Klára (UFP-V) ORCID
    Stöckel, Jan (UFP-V) RID
    Varju, Jozef (UFP-V) ORCID
    Weinzettl, Vladimír (UFP-V) RID, ORCID
    Popov, Tsv.K. (BG)
    Komm, Michael (UFP-V) RID, ORCID
    Dejarnac, Renaud (UFP-V) RID, ORCID
    Háček, Pavel (UFP-V) RID, ORCID
    Pánek, Radomír (UFP-V) RID
    Year of issue2016
    Languageeng - English
    CountryBG - Bulgaria
    Keywordsneutral beam injection heating ; plasma potential ; electron energy distribution function ; electron temperatura and density ; first-derivative probe technique
    Subject RIVBL - Plasma and Gas Discharge Physics
    R&D ProjectsLM2015045 GA MŠk - Ministry of Education, Youth and Sports (MEYS)
    GA16-25074S GA ČR - Czech Science Foundation (CSF)
    Institutional supportUFP-V - RVO:61389021
    AnnotationPředneseno na:
    7th International Workshop and Summer School on Plasma Physics (IWSSPP 2016), Kiten,26.06.-02.07.2016,
    This work presents the results from the swept probe measurements in the divertor region of the COMPASS tokamak in D-shaped, L-mode discharges, with toroidal magnetic field BT = - 1.15 T, plasma current Ip = -180 kA and varying line-average electron densities from 2 to 8x1019 m-3. Using the neutral beam injection (NBI) heating, the electron energy distribution function (EEDF) was studied before and during the application of the beam. The current-voltage characteristics data were processed using the novel first-derivative probe technique (FDPT). This technique allows to evaluate the plasma potential and the EEDF (respectively the electron temperatures and densities).
    At low average electron density of 2x1019 m-3 the EEDF is bi-Maxwellian with low-energy electron population with temperatures 4-6 eV and high energy electron group 12-25 eV. With increasing the line-average electron density the electron temperatures decrease. Above 7x1019 m-3 line-average electron density the EEDF is found to be a Maxwellian with temperature 6-8.5 eV.
    The dependence of the NBI heating power in divertor region was studied.
    WorkplaceInstitute of Plasma Physics
    ContactVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Year of Publishing2017
Number of the records: 1