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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及增长率随剪切量S_0的变化。结果发现:存在一个临界剪切值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。
The frequency and growth rate of the torsional modes of tokamak plasma with shear force S_0 were analyzed by using the internal mode dispersion of the ion dynamic parameters. The results show that there exists a critical shear value S_ (0c). Only when S_0> S_ (0c), that is, the central safety factor q_0 is less than a certain critical value q_ (0c), the resistive internal twist modes can be excited. On the other hand, with the increase of magnetic shear S_0, the growth rate tends to increase more rapidly than the corresponding torsional mode of resistive magnetizers, which is intrinsically linked to the fast crack of sawtooth. The results obtained are compared with the observed zigzag stabilization or sawtooth cycle elongation observed in a solid hydrogen pellet make-up gas test performed on the HL-1 unit.