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Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak
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SYSNO ASEP 0466022 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak Tvůrce(i) Ivanova, P. (BG)
Dimitrova, Miglena (UFP-V) ORCID
Vasileva, E. (BG)
Popov, Tsv.K. (BG)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Imríšek, Martin (UFP-V) RID
Háček, Pavel (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDČíslo článku 012003 Zdroj.dok. Journal of Physics: Conference Series, 768. - Bristol : IOP Publishing, Ltd., 2016 - ISSN 1742-6588 Poč.str. 4 s. Forma vydání Tištěná - P Akce International Workshop & Summer School on Plasma Physics 2014 (IWSSPP’14)/6./ Datum konání 30.06.2014 - 06.07.2014 Místo konání Kiten Země BG - Bulharsko Typ akce WRD Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Divertor probes ; plasma potential ; electron energy distribution function ; bi-Maxwellian distribution ; electron temperatura and density ; first-derivative probe technique Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP LM2011021 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GAP205/11/2341 GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000439544000003 EID SCOPUS 84996605513 DOI 10.1088/1742-6596/768/1/012003 Anotace This paper reports experimental data obtained on the COMPASS tokamak by Langmuir probes embedded in the divertor tiles. The measured current-voltage (IV) probe characteristics were processed by the recently published first derivative probe technique for precise determination of the plasma potential and the electron energy distribution function (EEDF). Measurements were performed during L-mode hydrogen and deuterium plasmas with toroidal magnetic field BT =1.15 T, plasma current Ip=180 kA and averaged electron density ne = 8*1019 m−3. The spatial profile of the electron temperatures shows that in hydrogen plasmas in the vicinity of the inner and outer strike points the EEDF can be approximated by a bi-Maxwellian distribution, with a dominating low-energy electron population (4 - 7 eV) and a minority of higher energy electrons (12 - 25 eV). In the private flux region between the two strike points the electron energy distribution function is found to be Maxwellian with temperatures in the range of 7 - 10 eV. In the case of deuterium plasmas at similar conditions of the discharge the EEDFs are found to be always bi-Maxwellian.
Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
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