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Study of Secondary Instability of 2/1 Magnetic Island in COMPASS High Density Limit Plasmas.
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SYSNO ASEP 0482424 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Study of Secondary Instability of 2/1 Magnetic Island in COMPASS High Density Limit Plasmas. Author(s) Salzedas, F. (PT)
Shah, S.I.W. (PT)
Havlíček, Josef (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Háček, Pavel (UFP-V) RID, ORCID
Varju, Jozef (UFP-V) ORCID
Havránek, Aleš (UFP-V) ORCID
Pánek, Radomír (UFP-V) RID
Silva, C. (PT)Article number P4.129 Source Title EPS 2017: 44th European Physical Society Conference on Plasma Physics, 41F. - Mulhouse : European Physical Society, 2017 / Fajardo M. ; Westerhof E. ; Riconda C. ; Melzer A. ; Bret A. ; Dromey B. - ISBN 979-10-96389-07 Number of pages 4 s. Publication form Online - E Action EPS 2017 Conference on Plasma Physics/44./ Event date 26.06.2017 - 30.06.2017 VEvent location Belfast Country IE - Ireland Event type EUR Language eng - English Country FR - France Keywords tokamaks ; COMPASS 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 Annotation For generating fusion power, high plasma density is indispensable for reactor tokamaks but it may lead to the density limit disruption (DLD). The physical mechanisms behind the underlying processes of DLD are only partially understood. The growing MHD instabilities are often regarded as precursors to DLD. A secondary instability to the rotating (2,1) magnetic island was observed prior to the thermal quench, when the amplitude of the magnetic island is large and its rotation frequency is low, first in JET and then in COMPASS tokamaks.
The secondary instability is characterized by small amplitude perturbations, with no m or n mode numbers, superimposed on the perturbations of the precursor magnetic island. The frequency of the SI is higher than the rotating frequency of the island itself.
The presented work focuses on the study of the SI behaviour in the period preceding the thermal quench.
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2018
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