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We examine the hydrodynamic stability of imploding ICF capsules by explicitly calculating the evolution of a realistic surface perturbation far into its nonlinear regime, using a 2D Lagrangian radiation‐hydrodynamics code. The perturbation, which consists initially of mesh displacements in the capsule, is represented by the sum of many spherical harmonic modes, having finite amplitudes and realistic spectrum. A 90‐degree sector of the capsule is modeled, allowing proper boundary conditions for all modes simultaneously. Because of the large distortion of the mesh that occurs during the calculations, it is necessary to rezone the mesh frequently, by mapping physical variables to a new undistorted mesh. No model‐specific parameters are required in this technique. We have used the technique to calculate the yield of several designs for a National Ignition Facility capsule as a function of initial root‐mean‐square surface roughness σ of the outer ablator surface or the inner cryogenic DT surface. Typically for...

Multimode hydrodynamic stability calculations for National Ignition Facility capsules