磁套筒内爆产生的MRT不稳定性

The MRT Instability in Magnetized Liner Implosions

通过采用三区平板模型和线性化的磁流体力学方程组,在不可压缩的条件下得到了增长率满足的色散关系.给出了增长率随内爆加速度的变化关系,随着内爆加速度的增加,增长率也不断增加.可以看出,在存在轴向磁场的情况下,对MRT不稳定性的发展有明显的抑制效果.另外,还给出了不同纵横比下内外界面扰动随时间的变化关系,可以看出在6~8之间,外界面对内界面的影响较小.虽然更小的纵横比可以让外界面扰动对内界面扰动的影响变得更小,但是这样不利于实验室的内爆过程;而更高的纵横比意味着更薄的套筒,不但会使MRT不稳定性对内界面的影响增大,而且自身的厚度可能也会导致套筒破裂而失去完整性.

In this paper, through employing three- region Hab model and the l inear izing magneto-hydrody-namics equat ions,the d isp e rs io n relat ion of the growth ra te in incomp re s s ib le condition . The axial magnetic field has a obvious effect on mitigat ing the MRT instabi lity. In addi tion, the variat ions of the ampl itude of in surface wi th the implosion time. When the aspect radio is 6-8, the ef fect of the feedthrough is smaller.A smal ler aspect radio is well for the MRT instabi lity, but it will make the implosions bad. For a high as-pect radio have a thin thickness, the liner symmetry can disrupted.