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Experimental observations of local plasma parameters in the COMPASS divertor in NBI-assisted L-mode plasmas
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SYSNO ASEP 0546978 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Experimental observations of local plasma parameters in the COMPASS divertor in NBI-assisted L-mode plasmas Author(s) Dimitrova, Miglena (UFP-V) ORCID
Popov, Tsv.K. (BG)
Havlíček, Josef (UFP-V) RID, ORCID
Bogár, Klára (UFP-V) ORCID
Varju, Jozef (UFP-V) ORCID
Hasan, E. (BG)
Dejarnac, Renaud (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Imríšek, Martin (UFP-V) RID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDNumber of authors 11 Article number P09004 Source Title Journal of Instrumentation. - : Institute of Physics Publishing - ISSN 1748-0221
Roč. 16, č. 9 (2021)Number of pages 15 s. Language eng - English Country GB - United Kingdom Keywords Data processing methods ; Ionization and excitation processes ; Plasma diagnostics probes Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2018117 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 8D15001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000768 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UFP-V - RVO:61389021 UT WOS 000701912900009 EID SCOPUS 85115428699 DOI 10.1088/1748-0221/16/09/P09004 Annotation This paper presents an experimental characterization of the local plasma parameters in the COMPASS open divertor in deuterium, L-mode plasmas by means of Langmuir probes during neutral beam injection (NBI) heating. The effect of NBI heating of the core plasma on the local divertor plasma parameters is investigated under different plasma configurations and different directions of the magnetic field and plasma current for different line-averaged electron densities. At low line-averaged densities below 6 × 1019 m-3, a low NBI heating power level does not lead to any significant changes in the plasma parameters in the divertor region. It is also found that for a reversed magnetic field the influence of NBI in the divertor is stronger at higher line-averaged electron density and plasma current. In the divertor, the impact of the NBI heating is more pronounced at high delivered powers (above P NBI = 320 kW) and line-averaged densities (above 7 × 1019 m-3). The electron temperature and the floating potential at the outer target increases respectively with 10-50% and 100%, while the plasma potential in the inner divertor increases twofold. At a higher line-averaged density, the NBI heating affects the edge plasma, namely, the electron temperature in the midplane scrape-off layer and the heating moves toward the divertor. Thus, a twice as high electron temperature is observed in the divertor and a bi-Maxwellian electron energy distribution function arises. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022 Electronic address https://iopscience.iop.org/article/10.1088/1748-0221/16/09/P09004/pdf
Number of the records: 1