https://doi.org/10.1051/epjconf/202431302005
Analysis of neoclassical tearing mode stabilization experiment by electron cyclotron injection in KSTAR
1 Department of Energy Systems Engineering, Seoul National University, Seoul, Korea
2 Korea Institute of Fusion Energy, Daejeon, Korea
3 Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, United States of America
4 Princeton Plasma Physics Laboratory, Princeton, New Jersey, United States of America
* Corresponding author: ysna@snu.ac.kr
Published online: 15 November 2024
We report the neoclassical tearing mode (NTM) stabilization experimental results by injection of the electron cyclotron (EC) beam in KSTAR, and its analysis with integrated modelling. In the KSTAR experiment, NTM was intentionally induced and the EC beam was injected by the plasma control system (PCS) to stabilize it. Here, the EC angle was controlled based on the minimum seeking algorithm for the island growth rate. Although the EC angle was not changed significantly, the island width significantly decreased towards the end of the experiment followed by the recovery of plasma performance. To assess the NTM stabilization experiment from a stability perspective, we performed integrated modelling with TRIASSIC utilizing the reconstructed equilibrium with magnetic diagnostics and motional stark effect diagnostics. As a result, we observed that the NTM is stabilized by EC.
© The Authors, published by EDP Sciences, 2024
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