Theoretical Analysis of the Frequency Jump in E-fishbone Experiments**Supported by the Funds of the Youth Innovation Team of Science and Technology in Sichuan Province of China under Grant No 2014TD0023, the National Natural Science Foundation of China under Grant Nos 11447228, 11261140327, 11005035 and 11205053, and the Project-the Plasma Confinement in the Advanced Magnetic Mirror under Grant No WX-2015-01-01.

Abstract

It is identified that barely passing electrons are the drive of the e-fishbones, rather than the barely trapped electrons at low frequency. The frequency jump in e-fishbone experiments is reproduced and analyzed. It is found that the e-fishbone frequency increases with the hot electron energy, which is consistent with the experiments. The growth rate of the mode (m = 2, n = 2) is greater than that of the mode (m = 1, n = 1).