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)
