Observation of Multiple Broadband Alfvénic Chirping Modes in HL-2A NBI Plasmas

• 作者: Liming Yu Wei Chen Xiaoquan Ji Peiwan Shi Xuantong Ding Zhongbing Shi Ruirui Ma Yumei Hou Yonggao Li Jiaxian Li Jianyong Cao Wulyu Zhong Min Xu Xuru Duan
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: PHYSICS OF GASES,PLASMAS,AND ELECTRIC DISCHARGES
• 页码范围: 41-45
• 页数: 5页
• 语种: 英文
• DOI: 10.1088/0256-307X/38/5/055202

摘要

Multiple broadband Alfvénic chirping modes (CMs),with frequencies in the wide range of f ～ 35-150 kHz and chirping down rapidly,are found in HL-2A neutral beam injection plasmas,and the CMs can even coexist.The frequency chirping down process can be completed within ～1 ms,and the frequency shift can reach 30-50 kHz.The CMs propagate in ion diamagnetic drift directions poloidally.The toroidal mode number is confirmed to be n =1,2,3 and 4 for the f ～ 35-65,55-90,70-120 and 100-150kHz CMs,respectively.The CMs are more like to be energetic-particle continuum modes (EPMs),since the modes almost locate on the Alfvén continuum.