SUNIST上MHD扰动测量和模式分析

摘要

Magneto hydrodynamic (MHD) instabilities are essential features in the magnetical confinement tokamak which plasma play an important role in discharge stabilization and plasma confinement. The Mirnov fluctuations are measured and analysed by magnetic measurement system on Sino-United Spherical Tokamak (SUNIST). The toroidal and poloidal numbers of Mirnov fluctuations are distinguished by using singular value decomposition(SVD), and the time evolution of the mode numbers during a discharge is present.%磁流体(Magneto Hydrodynamic,MHD)不稳定性是托卡马克磁约束聚变等离子体中的基本物理现象,是影响装置放电稳定性及等离子体约束性能的重要因素.通过磁探针诊断对SinoUnited Spherical Tokamak(SUNIST)上的Mirnov扰动进行测量和分析,利用奇异值分解(SVD)方法首次对扰动的环向和极向模数进行分辨,并给出放电过程中的模数时间演化过程.