题 目：Resonant Axisymmetric Modes in Tokamak Plasmas: analytic theory, numerical simulations, and experimental observations
报告人： Prof Franco Porcelli
时 间： 2023年10月31日（周二） 上午 9：30
地 点： 聚变所二楼大会议室
摘 要： Axisymmetriic modes (toroidal mode number n=0) exhibit an MHD singularity at magnetic X-points of a divertor tokamak configuration, where the equilibrium poloidal field vanishes. The resonance is expected to give rise to current sheets peaking at the X-point and extending along the magnetic separatrix, which may have a profound impact on the stability of vertical plasma displacements. Furthermore, vertical displacement oscillatory modes, with a characteristic frequency close to the poloidal Alfvén frequency, can interact resonantly with energetic ions, giving rise to a new type of fast ion instability with mode number n=0. We will discuss the analytic theory, numerical simulations and experimental observations of n=0 modes in tokamak plasmas.
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