Alfvén-character oscillations in ohmic plasmas observed on the COMPASS tokamak.

0482820 - ÚFP 2018 RIV FR eng C - Conference Paper (international conference)
Markovič, Tomáš - Melnikov, A. - Seidl, Jakub - Eliseev, L. - Havlíček, Josef - Havránek, Aleš - Hron, Martin - Imríšek, Martin - Kovařík, Karel - Bogár, Klára - Mlynář, Jan - Pánek, Radomír - Stöckel, Jan - Varju, Jozef - Weinzettl, Vladimír
Alfvén-character oscillations in ohmic plasmas observed on the COMPASS tokamak.
EPS 2017: 44th European Physical Society Conference on Plasma Physics. Vol. 41F. Mulhouse: European Physical Society, 2017 - (Fajardo, M.; Westerhof, E.; Riconda, C.; Melzer, A.; Bret, A.; Dromey, B.), č. článku P5.140. Europhysics Conference Abstracts (ECA). ISBN 979-10-96389-07.
[EPS 2017 Conference on Plasma Physics/44./. Belfast (IE), 26.06.2017-30.06.2017]
R&D Projects: GA ČR(CZ) GA16-25074S; GA MŠMT(CZ) 8D15001; GA MŠMT(CZ) LM2015045
Institutional support: RVO:61389021
Keywords : tokamak * COMPASS
OECD category: Fluids and plasma physics (including surface physics)

Energetic Particle driven plasma modes resulting from interaction of shear Alfvén waves with fast ions generated by fusion reactions, NBI or ICRH heating are capable of causing fast particle losses, negatively affecting the plasma performance or having detrimental effects on plasma-facing components or vacuum vessel. A number of reviews has already been published, describing properties of EP modes, their appearance, excitation and damping mechanisms, etc. The modes are not expected to appear in ohmic plasmas, however, plasma oscillations with their typical signatures have been reported in plasmas without an apparent source of EP on a number of devices. While impact of these phenomena on plasma performance does not seem to be significant, their investigation will yield understanding of the underlying EP mode physics. An observation of two types of such instabilities in ohmic régime plasmas on the COMPASS tokamak is reported and the modes characterised.
Permanent Link: http://hdl.handle.net/11104/0278329