Phase Effects of Long-Wavelength Rayleigh–Taylor Instability on the Thin Shell**Supported by the National Natural Science Foundation of China under Grant Nos. 11575033, 11675026 and 11975053, and the CAEP Foundation under Grant No. CX2019033.

Abstract

Taking the long-wavelength Rayleigh–Taylor instability (RTI) on the thin shell of inertial confinement fusion as the research object, a linear analytical model is presented to study the phase effects that are caused by the phase difference of single-mode perturbations on the two interfaces. Its accuracy is tested by numerical simulations. By analyzing the characteristic of this model, it is found that the phase difference does not change the basic RTI structure (only one spike and one bubble in a period). However, the symmetry of the spike and bubble is destroyed, which has non-expected influences on the convergent motion of ICF targets. Meanwhile, the phenomenon that the distance between spikes and bubbles along the vertical direction of acceleration differs by π is demonstrated. It is also shown that when the phase difference is large, the temporal evolution of the RTI is more serious and the thin target is easier to tend to break.