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22-27 October 2018
Mahatma Mandir Conference Centre
Asia/Kolkata timezone
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Seeding of tearing modes by internal crash events in ASDEX Upgrade and DIII-D tokamaks

26 Oct 2018, 14:00
4h 45m
Mahatma Mandir Conference Centre

Mahatma Mandir Conference Centre

Gandhinagar (nearest Airport: Ahmedabad), India
Poster P8 Posters

Speaker

Dr Valentin Igochine (Max-Planck-Institut für Plasmaphysik)

Description

Tearing mode formation after internal crash events like sawteeth or fishbones is one of the most important MHD processes that result in a big island structure and associated confinement degradation in tokamaks. This type of tearing mode formation is considered to be the most important for future fusion reactors like ITER, because large internal events provide strong magnetic perturbations and are thus able to trigger the mode already at very small normalized pressure values. The process implies magnetic reconnection at the rational surface, which has been investigated in great detail in the ASDEX Upgrade and DIII-D tokamaks. In this paper we show that such an internal crash event leads to an ideal kink mode which transforms into a tearing mode on a much longer timescale than the crash itself. Thus, the common belief of fast formation of a big island during the crash has to be revised.
Country or International Organization Germany
Paper Number EX/P8-21

Primary author

Dr Valentin Igochine (Max-Planck-Institut für Plasmaphysik)

Co-authors

Dr Anja Gude (Max-Planck Institute for Plasma Physics) Dr Carlos Paz-Soldan (General Atomics) Edward Strait (General Atomics) Prof. Hartmut Zohm (Max-Planck-Institut für Plasmaphysik) Dr Jeremy Hanson (Columbia University) Prof. Karl Lackner (Max-Planck Institute for Plasma Physics) Prof. Sibylle Günter (Max-Planck Institute for Plasma Physics)

Presentation Materials

Paper