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Observation of Secondary Instability of 2/1 Magnetic Island in COMPASS High Density Limit Plasmas.
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SYSNO ASEP 0483193 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Observation of Secondary Instability of 2/1 Magnetic Island in COMPASS High Density Limit Plasmas. Author(s) Shah, S.I.W. (PT)
Salzedas, F. (PT)
Havlíček, Josef (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Silva, C. (PT)Article number P5.003 Source Title 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 Number of pages 4 s. Publication form Online - E Action EPS 2016: Conference on Plasma Physics/43./ Event date 04.07.2016 - 08.07.2016 VEvent location Leuven Country BE - Belgium Event type EUR Language eng - English Country FR - France Keywords COMPASS ; tokamak ; density limit disruptions ; secondary instability Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFP-V - RVO:61389021 EID SCOPUS 85013910576 Annotation Density limit disruptions (DLDs) have been observed in high density tokamak plasmas. It is important to understand the dynamics of the DLDs so that better mitigation strategies can be developed. In this work, following detection in JET of a secondary instability (SI) to the m/n = 2/1 MHD mode in the precursor of DLD, we analyse the evolution of the magnetic island in COMPASS DLD to look for the presence of this SI just close to the onset of energy quench phase of the disruption. The presence of this SI was associated with the occurrence of minor disruptions preceding the major disruption and with the major disruption itself in [Salzedas, F., 2011]. The coherence observed between the perturbations caused by the SI in the magnetic poloidal flux and in the electron temperature was high, allowing to determine that the SI perturbations came from the same position as the magnetic island. In the work presented here, only the perturbations in the magnetic poloidal flux are analysed. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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