Numerical study on magneto-Rayleigh-Taylor instabilities for thin liner implosions on the primary test stand facility**Project supported by the National Natural Science Foundation of China (Grant Nos. 11605013, 11775032, 11805019, and 11705013).

Abstract

The thin aluminum liners with an aspect ratio R/Δr≪1 have been imploded on the primary test stand (PTS) facility, where R is the outer radius of the liner and Δr is the thickness. The x-ray self-emission images present azimuthally correlated perturbations in the liner implosions. The experiments show that at −10 ns before the stagnation, the wavelengths of perturbation are about 0.93 mm and 1.67 mm for the small-radius and large-radius liners, respectively. We have utilized the resistive magnetohydrodynamic code PLUTO to study the development of magneto-Rayleigh–Taylor (MRT) instabilities under experimental conditions. The calculated perturbation amplitudes are consistent with the experimental observations very well. We have found that both mode coupling and long implosion distance are responsible for the more developed instabilities in the large-radius liner implosions.