Počet záznamů: 1
Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak
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SYSNO ASEP 0501889 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Fluctuations in the scrape-off layer and edge plasma of the COMPASS tokamak Tvůrce(i) Seidl, Jakub (UFP-V) RID
Jiráková, Kateřina (UFP-V)
Adámek, Jiří (UFP-V) RID, ORCID
Grover, Ondřej (UFP-V) ORCID
Horáček, Jan (UFP-V) RID, ORCID
Hron, Martin (UFP-V) RID, ORCID
Vondráček, Petr (UFP-V) RID, ORCIDCelkový počet autorů 7 Číslo článku P1.1103 Zdroj.dok. 45th EPS Conference on Plasma Physics, 42A. - Mulhouse : 45th EPS Conference on Plasma Physics, 2018 - ISBN 9781510868441 Rozsah stran s. 481-484 Poč.str. 4 s. Forma vydání Online - E Akce 45th European Physical Society Conference on Plasma Physics Datum konání 02.07.2018 - 06.07.2018 Místo konání Praha Země CZ - Česká republika Typ akce WRD Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova plasma ; tokamak ; turbulence Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP GA16-25074S GA ČR - Grantová agentura ČR 8D15001 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy LM2015045 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFP-V - RVO:61389021 EID SCOPUS 85057874967 Anotace We have identified two distinct types of turbulent fluctuations in COMPASS plasmas, the high-frequency edge oscillations and low-frequency SOL blobs. The transition region is localized in the near SOL, where both types spatially overlap and interact and the radial particle transport gradually transfers from high to low frequencies. Even though skewness of isat fluctuations is positive even inside LCFS, distinguishable Gamma-distributed PDF, formed by the low-frequency fluctuations, arises in the near SOL. This supports, together with turbulence spreading rate being positive in the near SOL but negative in the edge, the picture presented in [3] that most of the fluctuations that form a positive skewness in the edge region disappear around LCFS and new blobs are formed in the near SOL. Further, we cannot confirm the assumption that the blobs are generated randomly according to a Poisson process. Oscillations of all measured quantities, incl. radial particle flux, in the near SOL are peaked around ∼13 kHz. This seems to correspond to a poloidally rotating structure with a rather large poloidal wave-length ∼ 15 − 20 cm, that at least partly modulates blob generation. Nevertheless, we note that time separation of blobs becomes more random further in the SOL, possibly due to differences in their individual propagation. These observations hold for diverted plasmas, but the situation may be different in limited low-elongation plasmas where the radius of zero skewness was observed to be shifted significantly (several cm) inwards, compared to diverted configuration, and Gamma-like PDF is detected even inside the LCFS. Study of these plasmas is ongoing. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2019 Elektronická adresa http://ocs.ciemat.es/EPS2018PAP/pdf/P1.1103.pdf
Počet záznamů: 1