Number of the records: 1
Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak
- 1.
SYSNO ASEP 0466022 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Determination of the plasma potential and the EEDF by Langmuir probes in the divertor region of COMPASS tokamak Author(s) 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) RIDArticle number 012003 Source Title Journal of Physics: Conference Series, 768. - Bristol : IOP Publishing, Ltd., 2016 - ISSN 1742-6588 Number of pages 4 s. Publication form Print - P Action International Workshop & Summer School on Plasma Physics 2014 (IWSSPP’14)/6./ Event date 30.06.2014 - 06.07.2014 VEvent location Kiten Country BG - Bulgaria Event type WRD Language eng - English Country GB - United Kingdom 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 OECD category Fluids and plasma physics (including surface 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 UT WOS 000439544000003 EID SCOPUS 84996605513 DOI 10.1088/1742-6596/768/1/012003 Annotation 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.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
Number of the records: 1