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Description
Energetic particle (EP) physics is one of the key issues in magnetic confinement fusion research, and fishbone instability, as an important branch of EP physics, plays an important role in plasma confinement and transport. Fishbone cycle frequency (ffc) refers to the reciprocal of the time interval between neighboring fishbones, and the larger the cycle frequency, the denser the fishbones. It is generally closely related to the plasma heating power. Two opposite types of dependencies between the fishbone cycle frequency and the NBI injection power have been observed on the EAST tokamak with similar experimental parameters [1].
This study will utilize simulation codes such as TRANSP, NUBEAM and M3D-K to conduct in-depth analysis of the experimental phenomena mentioned above. The goal is to identify key factors influencing the dependency between fishbone cycle frequency and NBI injection parameters, as well as plasma parameters. The study aims to clearly elucidate the physical mechanisms underlying these observations. Additionally, it will analyze variations in fishbone characteristics (frequency, growth rate, amplitude, etc.) under both situations. Furthermore, the study will assess the EP loss caused by fishbones and their impact on plasma confinement performance. These results may provide insights for actively controlling fishbones on future fusion reactors to mitigate EP losses.
[1] X. Zhu, L. Zeng, Z.Y. Qiu, et al., Dependence of fishbone cycle on energetic particle intensity in EAST low-magnetic-shear plasmas [J]. J. Plasma Phys., 2020, 86 905860610.
| Presentation type | Oral |
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