Observation of Electron Fishbone-Like Instabilities in EAST Heavy Impurity Ohmic Plasma

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2013,（7）
• 页码范围: 128-130
• 页数: 3页
• 语种: 英文
• DOI: 10.1088/0256-307X/30/7/075201

摘要

The transient burst of an internal kink mode is first observed in EAST heavy impurity ohmic plasma.The features of the electron fishbone-like mode are presented,and the fishbone-like instabilities are found to be driven by the trapped supra-thermal electrons.The processional frequency of the trapped supra-thermal electrons is calculated with different discharge parameters.The results indicate that the calculated processional frequency is consistent with the experimental observations,Furthermore,we also find that the frequency chirping of the long-lived mode is related to the evolution of the safety factor profile.