离子动力参数区托卡马克电阻性内扭曲模稳定性分析

STABILITY ANALYSIS OF TOKAMAK RESISTIVE INTERNAL KINK MODE IN ION KINETIC REGIME

利用离子动力参数区的内扭曲模色散关系分析了托卡马克等离子体电阻性内扭曲模的频率和增长率随磁剪切量s_0的变化。我们发现:存在一个临界磁剪切量s_0c,只有当s_0>s_0c时,即中心安全因子q_0小于某个临界值q_0c时,电阻性内扭曲模才能被激发。另一方面,随着磁剪切量s_0的加大,增长率增大的趋势比相应的磁流体电阻性内扭曲模快得多,因而与锯齿的快崩裂有内在的联系。所得结果与HL-1装置上进行的用固体氢丸补充送气实验中观测到的锯齿稳定化或锯齿周期的延长作了对比。

In this paper, we use the dispersion relation of Tokamak internal kink mode in ion kinetic regime to analyse the frequency and the growth rate of s0, the magnetic shear. We find that there is a critical shear s0c , and the resistive internal kink mode can only be excited when s0>s0c, i. e. , when q0<q0c<i. On the other hand, for large S0 case, the growth rate of the resistive internal kink mode is several times of that obtained from the MHD regime, which is consistent with the fast crash phenomena of sawtooth. Comparison has been made of the results with experiments in the HL - 1 device for sawtooth stabilization or its period prolongation in case of hydrogen pellet refueling.