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Determination of the EEDF by divertor probes in the COMPASS tokamak(IWSSPP2014)
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SYSNO ASEP 0430540 Document Type O - Others R&D Document Type Others Title Determination of the EEDF by divertor probes in the COMPASS tokamak(IWSSPP2014) Author(s) Dimitrova, Miglena (UFP-V) ORCID
Ivanova, P. (BG)
Vasileva, E. (BG)
Popov, Tsv.K. (BG)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Imríšek, Martin (UFP-V) RID
Pánek, Radomír (UFP-V) RIDYear of issue 2014 Language eng - English Country CZ - Czech Republic Keywords Divertor probes ; plasma potential ; electron energy distribution function ; bi-Maxwellian distribution ; electron temperatura and density ; first-derivative probe technique Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LM2011021 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GAP205/11/2341 GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 Annotation Předneseno na: 6th International Workshop and Summer School on Plasma Physics (IWSSPP2014)Kiten,BG,30.06-06.07.2014 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 Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2015
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