Počet záznamů: 1
On attenuation of electron current of flush-mounted probes and electrodes in magnetised plasmas
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SYSNO ASEP 0509559 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On attenuation of electron current of flush-mounted probes and electrodes in magnetised plasmas Tvůrce(i) Komm, Michael (UFP-V) RID, ORCID
Cavalier, Jordan (UFP-V) RID, ORCID
Podolník, Aleš (UFP-V) ORCID
Stöckel, Jan (UFP-V) RID
Adámek, Jiří (UFP-V) RID, ORCID
Dejarnac, Renaud (UFP-V) RID, ORCIDCelkový počet autorů 6 Číslo článku 096050 Zdroj.dok. Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 59, č. 9 (2019)Poč.str. 7 s. Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova 2-dimensional particle simulation ; scrape-off layer ; langmuir probe ; divertor ; surface ; bias ; tokamak ; divertor ; Langmuir probe ; pfc ; particle-in-cell ; electrode biasing Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP GA16-14228S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UFP-V - RVO:61389021 UT WOS 000480385900002 EID SCOPUS 85072101177 DOI 10.1088/1741-4326/ab2d7b Anotace The ratio of electron and ion saturation currents measured by probes embedded in the plasma-facing components (PFCs) in magnetised plasmas is typically lower than predicted by Langmuir theory. In the past, several works targeted various effects influencing the ion saturation current, which can be larger than expected, especially if the magnetic field is at a grazing angle with respect to the probe surface. In this contribution, we focus on the electron current, which can be reduced when the magnetic field line intercepting the probe passes through the magnetic pre-sheath of the nearby PFC. In such a case an effective potential well forms and repels a fraction of the electrons incoming from the plasma. Experimental results obtained by a tiltable limiter at the DITE tokamak are revisited and reproduced by means of 2D3V particle-in-cell simulations. The reduction of the electron current is indeed observed both in simulations and in experiment. This mechanism may also explain why some divertor biasing experiments did not produce E x B flows in the divertor region. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2020 Elektronická adresa https://iopscience.iop.org/article/10.1088/1741-4326/ab2d7b
Počet záznamů: 1