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Charged-particlespectroscopy is used to assess implosion symmetry in ignition-scale indirect-drive implosions for the first time. Surrogate D3He gas-filled implosions at the National Ignition Facility produce energetic protons via D+3He fusion that are used to measure the implosion areal density (&#0961;R) at the shock-bang time. By using protons produced several hundred ps before the main compression bang, the implosion is diagnosed in-flight at a convergence ratio of 3&#8211;5 just prior to peak velocity. This isolates acceleration-phase asymmetry growth. For many surrogate implosions, protonspectrometers placed at the north pole and equator reveal significant asymmetries with amplitudes routinely &#8819;10%, which are interpreted as &#8467;=2 Legendre modes. With significant expected growth by stagnation, it is likely that these asymmetries would degrade the final implosion performance. X-ray self-emission images at stagnation show asymmetries that are positively correlated with the observed in-flight asymmetries and comparable in magnitude, contradicting growth models; this suggests that the hot-spot shape does not reflect the stagnated shell shape or that significant residual kinetic energy exists at stagnation. More prolate implosions are observed when the laser drive is sustained (&#8220;no-coast&#8221;), implying a significant time-dependent asymmetry in peak drive

In-flight observations of low-mode ρR asymmetries in NIF implosions