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ADVANCES IN THE PROBE TECHNIQUE DIAGNOSTICS OF FUSION PLASMA (VEIT2017)
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SYSNO ASEP 0479844 Druh ASEP O - Ostatní výsledky Zařazení RIV O - Ostatní Název ADVANCES IN THE PROBE TECHNIQUE DIAGNOSTICS OF FUSION PLASMA (VEIT2017) Tvůrce(i) Hasan, E. (BG)
Dimitrova, Miglena (UFP-V) ORCID
Popov, Tsv.K. (BG)
Ivanova, P. (BG)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RIDRok vydání 2017 Jazyk dok. eng - angličtina Země vyd. BG - Bulharsko Klíč. slova Electron energy distribution function ; electron temperatura and density ; first-derivative probe technique ; four-parameter fit ; sheath expansion Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP LM2015045 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA16-24724S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 Anotace Předneseno na: 20th International Summer School Vacuum, Electron and Ion Technologies (VEIT2017), Sozopol, 25-29.09.2017.
The Langmuir probe is among the most frequently used tools in evaluating the plasma potential, electron temperature and density in the vicinity of the last closed flux surface (LCFS) and in the scrape-off layer (SOL) of tokamaks.
However, in some cases in tokamak SOL plasmas, the EEDF can deviate from Maxwellian. To correctly obtain the EEDF, for more than ten years now the first-derivative probe technique (FDPT) has been applied to determine the plasma potential and the real electron energy distribution function in fusion plasmas. In this work, a comparison between recent results obtained by the FDPT and the conventional probe technique is performed in the case of sheath expansion of the ion part of the IV probe characteristics. It is demonstrated how this technique should be applied in the case of an unsaturated ion part. Possible difficulties in recognizing the sheath expansion are also discussed. A good agreement between the four-parameter fit and the first-derivative probe technique is demonstrated.
Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2018
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