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扭曲模是托卡马克等离子体中一种常见的磁流体力学不稳定性。而安全因子(q)和比压(β)对扭曲模的产生、发展以及稳定化有着重要的、甚至是决定性的影响。本文从实验与模拟相结合的角度,基于HL-2A装置实验的一炮典型的偏滤器放电位形,研究了安全因子q和极向比压卢。对内扭曲模和外扭曲模的影响,分析了不同参数条件下的扭曲不稳定性。结果表明,当磁轴上的安全因子q_0<1时,内扭曲模有可能不稳定。当q_0>1时,内扭曲模是稳定的。而极向比压卢。对内、外扭曲模都有去稳作用,峰化的等离子体电流剖面(或安全因子剖面)对扭曲模有稳定作用。有关扭曲模稳定化措施中,必须综合考虑安全因子剖面和等离子体比压值,以利于实现托卡马克高性能放电。
Twisted mode is a common magnetohydrodynamic instability in tokamak plasma. The safety factor (q) and the specific pressure (β) have an important and even decisive influence on the generation, development and stabilization of twisted modes. In this paper, from the experimental and simulation point of view, based on HL-2A device experiments typical squall dive filter discharge profile, the safety factor q and the polar ratio of pressure Lu. The influence of internal torsional modulus and external torsional modulus on the torsional instability under different parameters are analyzed. The results show that when the safety factor on the magnetic axis q_0 <1, the internal twist mode may not be stable. When q_0> 1, the internal twist mode is stable. Polar ratio and pressure Lu. Both internal and external torsional modes have a destabilizing effect, and the peaked plasma current profile (or safety factor profile) has a stabilizing effect on the warp modes. Concerning the distortion mode stabilization measures, the safety factor profile and the plasma specific pressure must be taken into account in order to facilitate the high performance discharge of the tokamak.