Počet záznamů: 1
Impact of impurity seeding on the electron energy distribution function in the COMPASS divertor region
- 1.
SYSNO ASEP 0539282 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Impact of impurity seeding on the electron energy distribution function in the COMPASS divertor region Tvůrce(i) Dimitrova, Miglena (UFP-V) ORCID
Popov, Tsv.K. (BG)
Kovacic, J. (SI)
Dejarnac, Renaud (UFP-V) RID, ORCID
Gunn, J. P. (FR)
Ivanova, P. (BG)
Imríšek, Martin (UFP-V) RID
Stöckel, Jan (UFP-V) RID
Vondráček, Petr (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDCelkový počet autorů 11 Číslo článku 125015 Zdroj.dok. Plasma Physics and Controlled Fusion. - : Institute of Physics Publishing - ISSN 0741-3335
Roč. 62, č. 12 (2020)Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova Divertor Langmuir probes ; Electron energy distribution function ; Impurity seeding ; Parallel heat-flux densities ; Tokamak COMPASS Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP GA20-28161S GA ČR - Grantová agentura ČR LM2018117 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy 8D15001 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy EF16_019/0000768 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UFP-V - RVO:61389021 UT WOS 000585706800001 EID SCOPUS 85095817913 DOI 10.1088/1361-6587/abc08f Anotace In the COMPASS tokamak, series of experiments were performed aimed at studying the impact of nitrogen, neon, and argon impurity seeding on the electron energy distribution function (EEDF) in the divertor region. The experiments were conducted in D-shaped, L-mode, deuterium plasmas. In order to obtain the radial distribution of the floating potential, ion saturation current, electron temperatures, and densities, the current-voltage characteristics were measured by Langmuir probes embedded in the COMPASS tokamak divertor. The properties of the plasma in the divertor region were measured before and during impurity seeding. Before the N2 seeding, the EEDF was bi-Maxwellian with a low-energy electron fraction with temperatures 3.5–5 eV, and a higher-energy one with temperatures in the range of 10 eV to 23 eV. During seeding with an increasing number of molecules per second, the EEDF changed from bi-Maxwellian to Maxwellian and the electron temperature decreased. The time-evolution was studied of the change in the EEDF during N2 seeding. When the seeding was carried out by a valve in the private flux region, the duration of the transition from a bi-Maxwellian to a Maxwellian EEDF was about 10–15 ms. When the N2 seeding took place through a low-field side valve, the transition from a bi-Maxwellian to a Maxwellian EEDF took longer −25–45 ms. The temporal evolution was also analyzed of the plasma parameters’ radial profiles when neon and argon were puffed using a valve in the divertor low-field side. The application is discussed of the probe measurements’ results to calculating the parallel heat-flux densities in the divertor region of the COMPASS tokamak. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2021 Elektronická adresa https://iopscience.iop.org/article/10.1088/1361-6587/abc08f
Počet záznamů: 1