Observation of geodesic acoustic mode-like oscillations on COMPASS

0453356 - ÚFP 2016 RIV PT eng C - Conference Paper (international conference)
Seidl, Jakub - Hron, Martin - Adámek, Jiří - Vondráček, Petr - Horáček, Jan - Hidalgo, C. - Melnikov, A. - Eliseev, L. - Markovič, Tomáš - Stöckel, Jan - Basu, D. - Háček, Pavel - Havlíček, Josef - Imríšek, Martin - Kovařík, Karel - Weinzettl, Vladimír - Pánek, Radomír
Observation of geodesic acoustic mode-like oscillations on COMPASS.
EPS 2015:42nd European Physical Society Conference on Plasma Physics. Vol. 39E. Mulhouse: European Physical Society, 2015, P4.103-P4.103. Europhysics Conference Abstracts, ECA, 39E. ISBN 2-914771-98-3.
[EPS 2015 Conference on Plasma Physics/42./. Lisbon (PT), 22.06.2015-26.06.2015]
R&D Projects: GA ČR(CZ) GAP205/12/2327; GA ČR(CZ) GA15-10723S; GA MŠMT(CZ) LM2011021
EU Projects: European Commission(XE) 633053
Institutional support: RVO:61389021
Keywords : plasma * tokamak * geodesic acoustic mode * zonal flows
Subject RIV: BL - Plasma and Gas Discharge Physics

We present observation of plasma potential oscillations on the COMPASS tokamak detected in a form of long range correlations between pair of reciprocating probes. The oscillations exhibit several characteristic features of geodesic acoustic mode (GAM). The probe diagnostics were supplemented by magnetic pick-up coils with full poloidal coverage at several toroidal locations and toroidal and poloidal structure of oscillations of magnetic field associated with the mode are discussed. Moreover, change of frequency and amplitude of the oscillations is observed during sawtooth crashe cycle and during penetration of externally applied magnetic perturbations into the plasma.
Permanent Link: http://hdl.handle.net/11104/0254186