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Electron energy distribution function in the divertor region of the COMPASS tokamak during neutral beam injection heating
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SYSNO ASEP 0489804 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Electron energy distribution function in the divertor region of the COMPASS tokamak during neutral beam injection heating Author(s) Hasan, E. (GB)
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
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) RIDArticle number 012002 Source Title Journal of Physics: Conference Series, 982. - Bristol : Institute of Physics Publishing, Ltd., 2018 - ISSN 1742-6596 Number of pages 6 s. Publication form Online - E Action International Workshop and Summer School on Plasma Physics, IWSSPP 2016/7./ Event date 26.06.2016 - 02.07.2016 VEvent location Kiten Country BG - Bulgaria Event type WRD Language eng - English Country GB - United Kingdom Keywords Neutral beam injection heating ; electron temperature ; bi-Maxwellian EEDF ; Divertor Langmuir probes ; first-derivative probe technique Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 UT WOS 000454714800002 EID SCOPUS 85045622867 DOI 10.1088/1742-6596/982/1/012002 Annotation This paper presents the results from swept probe measurements in the divertor region of the COMPASS tokamak in D-shaped, L-mode discharges, with toroidal magnetic field 1.15 T, plasma current 180 kA and line-average electron densities varying from 2 to 8×1019 m-3. Using neutral beam injection heating, the electron energy distribution function is studied before and during the application of the beam.
The current-voltage characteristics data are processed using the first-derivative probe technique. This technique allows one to evaluate the plasma potential and the real electron energy distribution function (EEDF) (respectively, the electron temperatures and densities).
At the low average electron density of 2×1019 m-3, the EEDF is bi-Maxwellian with a low-energy electron population with temperatures 4-6 eV and a high energy electron group 12-25 eV. As the line-average electron density is increased, the electron temperatures decrease. At densities above 7×1019 m-3, the EEDF is found to be Maxwellian with a temperature of 6-8.5 eV.
The effect of the neutral beam injection heating power in the divertor region is also studied.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2019
Number of the records: 1