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This collision can launch compression waves back toward the implosion that can perturb its symmetry and shock timing. The time for any compression wave to move from the surface of stagnation to the capsule is determined by the distance between the capsule ablation front and stagnation location and the speed difference between the incoming compression wave (i.e., sound speed, cs) and the outgoing capsule ablation velocity, vabl. Namely, along the symmetry axis between the capsule and pellet, the transit time is t=\u222bzcap(t)zstag(t)dz\/[cs(z)\u2212vabl(z)], where zstag is the location where the stagnation surface intersects the symmetry axis and zcap is the outer radius of the capsule ablation front along the symmetry axis. The location of the stagnation surface is determined by the ablation rate of the implosion vs that of the pellet. A low-Z material pellet will have an ablation rate more comparable to the capsule and, therefore, move the stagnation surface closer to the capsule, whereas high-Z materials generally have low ablation rates due to their x-ray albedo, and are overwhelmed by the capsule ablation, thus moving the stagnation surface further away.","type":"other"},{"key":"pvf9-6nrtCc22R1","unstructured":"J. Green, Radiation flux smoothing, unpublished R & D Associates report (1982).","type":"other"},{"key":"pvf9-6nrtCc23R1","unstructured":"S. Haan, Radiation transport between concentric spheres, Unpublished report, Lawrence Livermore National Laboratory, 1983.","type":"other"},{"key":"pvf9-6nrtCc24R1","doi-asserted-by":"publisher","DOI":"10.1088\/0029-5515\/40\/12\/309","type":"journal-article"},{"key":"pvf9-6nrtCc25R1","unstructured":"G. Kerbel, P. Michel, and M. 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