Počet záznamů: 1
Electromagnetic characteristics of geodesic acoustic mode in the COMPASS tokamak
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SYSNO ASEP 0480872 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Electromagnetic characteristics of geodesic acoustic mode in the COMPASS tokamak Tvůrce(i) Seidl, Jakub (UFP-V) RID
Krbec, Jaroslav (UFP-V)
Hron, Martin (UFP-V) RID, ORCID
Adámek, Jiří (UFP-V) RID, ORCID
Hidalgo, C. (ES)
Markovič, Tomáš (UFP-V) RID
Melnikov, A.V. (RU)
Stöckel, Jan (UFP-V) RID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Aftanas, Milan (UFP-V) RID
Bílková, Petra (UFP-V) RID
Bogár, Ondrej (UFP-V) ORCID
Böhm, Petr (UFP-V) RID
Eliseev, L.G. (RU)
Háček, Pavel (UFP-V) RID, ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Horáček, Jan (UFP-V) RID, ORCID
Imríšek, Martin (UFP-V) RID
Kovařík, Karel (UFP-V) RID, ORCID
Bogár, Klára (UFP-V) ORCID
Pánek, Radomír (UFP-V) RID
Tomeš, Matěj (UFP-V)
Vondráček, Petr (UFP-V) RID, ORCIDČíslo článku 126048 Zdroj.dok. Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 57, č. 12 (2017)Poč.str. 15 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. AT - Rakousko Klíč. slova geodesic acoustic mode ; tokamak ; turbulence ; COMPASS 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 GA14-35260S GA ČR - Grantová agentura ČR GA16-24724S GA ČR - Grantová agentura ČR GA15-10723S 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 UT WOS 000413136900002 EID SCOPUS 85034417019 DOI 10.1088/1741-4326/aa897e Anotace Axisymmetric geodesic acoustic mode (GAM) oscillations of the magnetic field, plasma potential and electron temperature have been identified on the COMPASS tokamak. This work brings an overview of their electromagnetic properties studied by multi-pin reciprocating probes and magnetic diagnostics. The n = 0 fluctuations form a continuous spectrum in limited plasmas but change to a single dominant peak in diverted configuration. At the edge of diverted plasmas the mode exhibits a non-local structure with a constant frequency over a radial extent of at least several centimeters. Nevertheless, the frequency still reacts on temporal changes of plasma temperature
caused by an auxiliary NBI heating as well as those induced by periodic sawtooth crashes. Radial wavelength of the mode is found to be about 1–4 cm, with values larger for the plasma potential than for the electron temperature. The mode propagates radially outward and its radial structure induces oscillations of a poloidal E × B velocity, that can locally reach the level of the mean poloidal flow. Bicoherence analysis confirms a non-linear interaction of GAM with a broadband ambient turbulence. The mode exhibits strong axisymmetric magnetic oscillations that are studied both in the poloidal and radial components of the magnetic field. Their poloidal standing-wave structure was confirmed and described for the first time in diverted plasmas. In limited plasmas their amplitude scales with safety factor. Strong suppression of the magnetic GAM component, and possibly of GAM itself, is observed during co-current but not counter-current NBI.Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2018
Počet záznamů: 1