【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
【机 构】
：
Southwestern Institute of Physics,Chengdu 610041,China;Key Laboratory of Materials Modification by L
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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.
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