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The destabilization of shear Alfvén waves (SAWs) associated with the loss of energetic particles generated by neutral beam injection (NBI) has been observed on several tokamaks [1‐5].Since the particles with velocities comparable to the Alfvén velocity will be abundantly exist as the D‐T reaction production in future reactor plasma,the interaction between α particles and SAWs is expected to be intensive and will have a great impact on the α particles confiement [1].