Comparison of Pedestal Turbulence Dynamics in ELMing and RMP-Driven ELM Suppression
ORAL
Abstract
With high-speed broadband electron cyclotron emission (ECE) measurements in KSTAR, the electron temperature turbulent fluctuations have been measured in high spatial resolution during the ELMing and ELM suppression phase. To investigate the structure and dynamics of turbulence occurring in the two different phases, spatial scales, parity, and cross-phase between electron temperature and radial velocity fluctuations were evaluated using velocimetry of measured 2-D electron temperature fluctuations. Furthermore, the effect of electron temperature fluctuations on maintaining the final form of the electron transport barrier was studied through comparative analysis with the profile data. Comprehensive comparisons with turbulence properties confirmed that the types and causes of turbulence in the two phases were different and that the role of contributing to heat and particle transport could be different as well.
*This work was supported by the R&D Program of "KSTAR Experimental Collaboration and Fusion Plasma Research (1711124789)" through the Korea Institute of Fusion Energy (KFE), and the National Research Foundation of Korea (NRF) grant No. 2019R1F1A1057545 funded by the Government funds.
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Presenters
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J. H. Lee
- Korea Institute of Fusion Energy
- Korea Institute for Fusion Energy, Daejeon, Republic of Korea
- Korea Institute of Fusion Energy (KFE)