In this paper, we introduce a novel experimental platform for the study of the Richtmyer–Meshkov instability in a cylindrically converging geometry using a magnetically driven cylindrical piston. Magnetically driven solid liner implosions are used to launch a shock into a liquid deuterium working fluid and, ultimately, into an on-axis rod with a pre-imposed perturbation. The shock front trajectory is tracked through the working fluid and up to the point of impacting the rod through the use of on axis photonic Doppler velocimetry. This configuration allows for precise characterization of the shock state as it impacts the perturbed rod interface. Monochromatic x-ray radiography is used to measure the post-shock interface evolution and rod density profile. The ALEGRA MHD model is used to simulate the dynamics of the experiment in one dimension. We show that late in time the perturbation growth becomes non-linear as evidenced by the observation of high-order harmonics, up to n = 5. Two dimensional simulations performed using a combination of the GORGON MHD code and the xRAGE radiation hydrodynamics code suggest that the late time non-linear growth is modified by convergence effects as the bubbles and spikes experience differences in the pressure of the background flow.

中文翻译：

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一种新颖的磁驱动会聚 Richtmyer-Meshkov 平台

在本文中，我们介绍了一种新的实验平台，用于使用磁驱动圆柱形活塞研究圆柱形收敛几何中的 Richtmyer-Meshkov 不稳定性。磁力驱动的固体衬里内爆用于将冲击发射到液态氘工作流体中，并最终发射到带有预加扰动的同轴杆中。通过使用轴上光子多普勒测速仪，可以通过工作流体跟踪冲击波前的轨迹，直到撞击棒的点。这种配置允许精确表征冲击状态，因为它会影响受扰动的杆界面。单色 X 射线摄影用于测量冲击后界面演变和棒密度分布。ALEGRA MHD 模型用于在一维中模拟实验的动力学。