西南物理研究院于利明博士将于6月4-6号访问中心，并做一个HL-2A上高能粒子不稳定性实验的报告，初步定在6月5号（星期三）下午3点。 欢迎大家参加！ 报告题目和摘要如下：
报告题目： observation of the Chirping Modes during NBI Heating on HL-2A
摘要： Many branches of energetic particle mode (EPM) instabilities, with frequencies (f) in the range of f~35-150 kHz and chirping down rapidly, are found during high-power NBI heating on HL-2A. The frequency shift (Δf) can reach to 20-50 kHz within 1 ms. The instabilities propagate in ion diamagnetic drift directions in poloidal. The toroidal mode number (n) is confirmed as n=1 for a low frequency branch mode (f=35-60~kHz), but the poloidal mode number (m) changes from m=2 to 3 and 4 in a process of the mode chirping down. It is indicated that the mode moves from the core to the edge, and also means the energetic ions expelled from the core to the edge. The n of the modes with frequencies in the range of 60-90 kHz and 80-150 kHz are confirmed as n=2 and 3, respectively. Sometimes, the mode is identified as an energetic-particle continuum mode, which is called energetic particle mode (EPM), since the mode locates between the frequencies of continue accumulation point of toroidal Alfvén eigenmode (TAE) and Beta induced Alfvén eigenmode (BAE). The chirping modes can also locate on BAE and TAE gap, so we call them BAE-EPM and TAE-EPM. The nonlinear interaction between EPMs and low-frequency tearing mode (TM)/Long-lived mode (LLM) are found.