Plasma and Fusion Research
Volume 19, 1202008 (2024)
Rapid Communications
- 1)
- Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
- 2)
- Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
- 3)
- Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan
- 4)
- Max-Planck Institute for Plasma Physics, Greifswald, Germany
Abstract
The response of energetic particle (EP)-driven magnetohydrodynamic instability to electron cyclotron heating (ECH) was experimentally studied in Heliotron J. The neutral beam injection power remained constant throughout the experiment, and the ECH power was systematically modulated. When the ECH power was gradually decreased to a certain threshold, the excitation of an EP mode with a frequency of approximately 100 kHz was observed. The response to ECH showed a close linkage with variations in electron density and temperature. In addition, a distinct delay response effect concerning plasma pressure suggests a complex delay response of mode excitation and suppression.
Keywords
MHD instability, energetic-particle-driven mode, ECH
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