Since 18 of December 2019 conferences.iaea.org uses Nucleus credentials. Visit our help pages for information on how to Register and Sign-in using Nucleus.

17–22 Oct 2016
Kyoto International Conference Center
Japan timezone

Study of toroidal rotation and ion temperature pedestals between ELM bursts on KSTAR H-mode plasmas

19 Oct 2016, 14:00
4h 45m
Kyoto International Conference Center

Kyoto International Conference Center

Takaragaike, Sakyo-ku, Kyoto 606-0001 Japan
Poster EXW - Magnetic Confinement Experiments: Wave–plasma interactions; current drive; heating; energetic particles Poster 4

Speaker

Dr Sehoon Ko (National Fusion Research Institute)

Description

Steep pedestal profiles of ion temperature (Ti) and toroidal rotation (VФ) are routinely observed in neutral beam injection(NBI)-heated KSTAR H-mode plasmas[W. H. Ko et al Nucl. Fusion {\bf55} 083013 (2015)]. In this work, we report a result of detailed analysis of pedestal characteristics. By analyzing a set of data with different experimental conditions, we show that Ti and VФ pedestals are coupled each other whose correlation becomes stronger when NBI-power is low. This suggests the existence of intrinsic toroidal torque in the pedestal. To investigate further the magnitude and the role of intrinsic torque, we perform a 1D transport analysis and find that the prevalence of residual micro-turbulences is necessary to explain momentum transport in the pedestal. The estimated strength of intrinsic torque is shown to be comparable to that from a 2.7MW NBI source. Finally, we show that non-diffusive momentum flux is indispensable to explain momentum transport in the pedestal and a residual stress model fits the observed momentum flux reasonably.
Country or International Organization Republic of Korea
Paper Number EX/P4-16

Primary author

Dr Sehoon Ko (National Fusion Research Institute)

Co-authors

Dr Hogun Jhang (National Fusion Research Institute) Dr Jaemin Kwon (National Fusion Research Institute) Dr Laurent Terzolo (National Fusion Research Institute) Dr Sungsik Kim (National Fusion Research Institute) Dr Won Ha Ko (Korea, Republic of)

Presentation materials

There are no materials yet.