JET and COMPASS asymmetrical disruptions

0453779 - ÚFP 2016 RIV AT eng J - Journal Article
Gerasimov, S.N. - Abreu, P. - Baruzzo, M. - Drozdov, V. - Dvornova, A. - Havlíček, Josef - Hender, T.C. - Hronová-Bilyková, Olena - Kruezi, U. - Li, X. - Markovič, Tomáš - Pánek, Radomír - Rubinacci, G. - Tsalas, M. - Ventre, S. - Villone, F. - Zakharov, L.E.
JET and COMPASS asymmetrical disruptions.
Nuclear Fusion. Roč. 55, č. 11 (2015), s. 113006-113006. ISSN 0029-5515. E-ISSN 1741-4326
R&D Projects: GA MŠMT(CZ) LM2011021
Institutional support: RVO:61389021
Keywords : tokamak * asymmetrical disruption * JET * COMPASS
Subject RIV: BL - Plasma and Gas Discharge Physics
Impact factor: 4.040, year: 2015

Asymmetrical disruptions may occur during ITER operation and they may be accompanied by large sideways forces and rotation of the asymmetry. This is of particular concern because resonance of the rotating asymmetry with the natural frequencies of the vacuum vessel (and other in-vessel components) could lead to large dynamic amplification of the forces. A significant fraction of non-mitigated JET disruptions have toroidally asymmetric currents that flow partially inside the plasma and partially inside the surrounding vacuum vessel ('wall'). The toroidal asymmetries (otherwise known as the appearance of 3D structures) are clearly visible in the plasma current (I-p) and the first plasma current moments. For the first time we present here the asymmetries in toroidal flux measured by the diamagnetic loops and also propose a physical interpretation. The presented data covers the period of JET operation with a C-wall (JET-C from 2005 until late 2009) and with an ITER-like wall
Permanent Link: http://hdl.handle.net/11104/0254600