Observation of Quasi-Coherent Modes by Far-forward Collective Scattering in J-TEXT Density Limit Plasmas
ID:26 View Protection:PUBLIC Updated Time:2021-07-13 15:54:01 Hits:101 Poster Presentation

Start Time:2021-07-12 08:00 (Asia/Shanghai)

Duration:20min

Session:[E] E-poster [E] E-poster

Abstract
The quasi-coherent modes (QCMs) was observed by the multi-channel three-wave polarimeter-interferometer system (POLARIS) based on the spectra analysis of density fluctuation in J-TEXT. The frequency range of QCMs is 30kHz to 100kHz and located at the minor radius r about 0.45a-0.7a in the interior of plasma in each disruptive shots. The QCMs are found related to the density, and it can be observed in each density limit disruptive shots while not onset in some undisruptive shots.The QCM enhancement occurs well before MARFE onset in density limit disruptive shots.
Keywords
quasi-coherent modes;density limit;MARFE
Speaker
YuHan Wang
International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electro

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Contact:
Prof. Lu Wang

Email: luwang@hust.edu.cn

Prof. Zhongyong Chen

Email: zychen@hust.edu.cn

Jingwei Fu

Email: fujingwei@hust.edu.cn

Meiling Liang

Email: mlliang@hust.edu.cn

Wei Zheng

Email: zhengwei@hust.edu.cn