摘要详情

ID / 提交时间

11 / 2021-04-02 13:18:57

标题

Observation of Quasi-Coherent Modes Behavior by Far-forward Collective Scattering in J-TEXT Density Limit Plasmas

关键字

quasi-coherent modes,density limit disruption,far-forward collective scattering measurement

主题及专题

全体主题

状态

摘要待审

作者

YuHan Wang / Huazhong University of Science and Technology, Wuhan

Li Gao / Huazhong University of Science and Technology, Wuhan

Peng Shi / United Kingdom Atomic Energy Authority； Culham Centre for Fusion Energy； Culham Science Centre；Abingdon； Oxon； 0X14 3DB； United Kingdom

Hui Li / 核工业西南物理研究院

ChengShuo Shen / Huazhong University of Science and Technology, Wuhan

QingLong Yang / Huazhong University of Science and Technology, Wuhan

Zhuo Huang / Huazhong University of Science and Technology

摘要

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. [1] The frequency range of QCMs is 30kHz to 100kHz and located at the minor radius r about 0.45a-0.6a in the interior of plasma only in disruptive shots. The QCMs are found related to the transition of the temperature gradient mode (ITG), which are implied by the Extended Fluid Code simulation. The plasma density profile broadens and the peaking factor of current profile increases to saturation with the appearance of QCMs. The occurrence of QCMs can be proposed as a precursor of subsequent disruption.