Time: 2016-12-15 14:00:00
Speaker: Yueyan Li [IFTS-ZJU]
Abstract: Title: Radial outward shift of kinetic ballooning mode by parallel ion effect
Venue: Rm. 413, Bld. 11#, Yuquan Campus
Abstract: The kinetic ballooning mode (KBM) plays an important role in H mode formation and edge-localized mode (ELM) physics and internal transport barrier. A thorough understanding of the linear KBM physics is crucial to understanding the nonlinear edge physics in tokamaks. The linear properties of KBM have recently been compared using different codes, and have been reported that, in contrast to ITG and TEM, it is extremely sensitive to the equilibrium configuration profile. In the previous researches, the KBM is found unstable in the second stability regime of s-alpha space. This KBM mode is characterized by a broad-spread eigenfunction in the ballooning space, and destabilized by the ion temperature gradient. Such KBM mode almost exists in the entire second stability regime. Also KBM has been found in the sufficiently small shear even with negative shear. In this work, linear theory of KBM has been researched, and the parallel ion effect has been investigated, which has predicted that KBM has different responses to the parallel ion effect with different magnetic shear. The theoretical predictions is supported by GTC simulation result.