Observation of Quasi-Coherent Modes by Far-forward Collective Scattering in J-TEXT Density Limit Plasmas 10th International workshop on "Stochasticity in Fusion Plasmas (SFP)"-"3D physics in stellarators and tokamaks"

Presentation Details

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：1464 Poster Presentation

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

Duration：20min

Session：E E-poster » EE-poster

Presentation File

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