  In this work, we present a novel kind of energetic particle modes with
frequencies in the range of thermal ion diamagnetic and/or transit frequencies
in burning plasmas. It is shown that the continuum structure can be broken by
the energetic particles. In addition, the mode destabilization does not require
the energetic particle drive to overcome the continuum damping, which indicates
that they are much easier to be excited and thus manifest themselves as
wide-band modes. Based on the analysis, a switch or even an oscillation between
phases of discrete eigenmodes and wide-band modes can be predicted.
