Study On Reversed Shear Alfvén Eigenmode

Due to Alfven eigenmode is easily excited, it widely exist in tokamak. This has been observed in a lot of experimental facilities. Especially, the interaction between Alfven eigenmode and particle will heat the particle and influence particle’s constraint. So people pay much attention to it. Alfven eigenmode has many kinds, because of different effect, and arises in the different place of the continuous spectrum.This paper focus on Reversed Shear Alfven Eigenmode(RSAE). We use KAEC code to see ideal RSAE’ character by changing pressure, density, safety factor and inverse aspect ratio. Then we introduce the kinetic part to see the ion cyclotron radius and the electron collision frequency’s influence on RSAE, especially its damping rate.To solve more general Alfven eigenmode problem when it contain nonlinear eigenvalue problem, we search for some nonlinear eigenvalue problem algorithm. We write a code as Newton’s method and compare with a foreign team’s SLEPc code, find their strengths and weaknesses.