Počet záznamů: 1
Geodesic mode instability driven by electron and ion fluxes in tokamaks
- 1.
SYSNO ASEP 0462525 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Geodesic mode instability driven by electron and ion fluxes in tokamaks Tvůrce(i) Elfimov, A.G. (BR)
Camilo de Souza, F. (BR)
Galvão, R.M.O. (BR)
Krbec, Jaroslav (UFP-V)
Seidl, Jakub (UFP-V) RID
Stöckel, Jan (UFP-V) RID
Hron, Martin (UFP-V) RID, ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Bogár, Klára (UFP-V) ORCIDČíslo článku P2.038 Zdroj.dok. EPS 2016: 43rd European Physical Society Conference on Plasma Physics, 40A. - Mulhouse : European Physical Society, 2016 / Mantica P. ; Giruzzi G. ; Fajardo M. ; Gans T. ; Poedts S. ; Vennekens N. - ISBN 2-914771-99-1 Poč.str. 4 s. Forma vydání Online - E Akce EPS 2016: Conference on Plasma Physics/43./ Datum konání 04.07.2016 - 08.07.2016 Místo konání Leuven Země BE - Belgie Typ akce EUR Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova tokamak ; COMPASS ; GAM Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech CEP GA16-25074S GA ČR - Grantová agentura ČR GA14-35260S GA ČR - Grantová agentura ČR LM2015045 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy 8D15001 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFP-V - RVO:61389021 EID SCOPUS 85013965720 Anotace Geodesic Acoustic Modes (GAM) are M=0, N=0 axisymmetric toroidal modes combined with M=±1, ±2 poloidal side-bands and driven by the electron and anisotropic ion pressure perturbations with the frequency \omega_G^2 = (7T_i/2+2T_e)/R_0^2m_i. These modes may be important for plasma transport as it has been theoretically discussed [2] and observed in experiments [4-7]. Furthermore, they may be useful as a diagnostic tool to indicate L-H confinement transition in tokamaks [5]. Eigenmodes in the geodesic frequency range have been experimentally detected under a wide range of conditions in various tokamaks. Typically, GAM oscillations are observed during counter NB injection [7,8], but they may also appear in ohmic discharges [6,8]. The nature of the experimentally observed geodesic eigenmodes is still not clear and several different mechanisms might be responsible for their dispersion and manifest themselves in different conditions. Recently, it has been theoretically shown that GAMs may be driven by an electric current with velocity along the equilibrium magnetic field in combination with the diamagnetic drift [3]. The instability occurs only when the electron current velocity is higher than the GAM phase velocity of sidebands, V_{e0}>Rq\omega
Here, we extend previous studies [3] and investigate whether the parallel plasma flow can drive the GAMs via coupling with the ion drift dynamics or/and the parallel current. Finally, comparison with NB experiments in COMPASS tokamak is discussed.
Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
Počet záznamů: 1