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17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Excitation of zonal flows and their impact on dynamics of edge pedestal collapse

21 Oct 2016, 18:20
20m
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Oral THS - Magnetic Confinement Theory and Modelling: Stability ELMs Suppression & Dynamics

Speaker

Dr Hogun Jhang (National Fusion Research Institute)

Description

We study the role of zonal flows in edge pedestal collapse using a reduced magnetohydrodynamic (MHD) model. A dramatic change of dynamics happens when ideal ballooning modes are stabilized. A detailed analysis shows that a zonal flow driven instability is developed due to a strong excitation of zonal vorticity, resulting in secondary crashes. The presence of subsidiary bursts after a main crash increases the effective crash time and energy loss. These simulation results resemble the behavior of compound edge localized modes (ELMs). Thus, our results indicate that a complete understanding of ELM crash dynamics requires the self-consistent inclusion of nonlinear zonal flows-MHD interaction and transport physics.
Country or International Organization Republic of Korea
Paper Number TH/8-3

Primary author

Dr Hogun Jhang (National Fusion Research Institute)

Co-authors

Dr Helen H Kaang (NFRI) Prof. Raghvendra Singh (ITER-Cadarache / IPR-India) Dr S S Kim (NFRI) Prof. Taik Soo Hahm (Seoul National University) Dr Tongnyeol Rhee (NFRI, Daejeon, South Korea)

Presentation materials