Energetic Trapped Particle Bounce Resonance Excitation of the Ideal Ballooning Mode

抄録

Energetic trapped particles bounce resonance excitation of magnetohydrodynamic (MHD) ballooning mode is studied by using the averaged ballooning mode equation in a tokamak with the circular cross section. The bounce resonance contribution of trapped energetic particles is found to play an important role in the outer inertial region of the ballooning mode perturbation, and destabilizes the ballooning mode when the shear effect is not strong. The inhomogeniety of a model slowing down energetic particle distribution in velocity space, ∂F⁄∂E<0, is effective to stabilize the bounce resonant mode.