A systematic study of Energetic particle-induced geodesic acoustic mode (EGAM) has been carried for bump-on-tail energetic distribution in tokamak plasmas using linear global hybrid simulation. The stability threshold of EGAM in energetic particle pressure is found to be very low. The eignemode structure becomes more and more radially extended as beam ion distribution evolves from bump tail distribution to fully slowing down distribution. The mode radial width increase with energetic particle gyroradius while the growth rate is maximized at / 0.3 A v v = .
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