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This Letter reports the first time-gated proton radiography of the spatial structure and temporal evolution of how the fill gas compresses the wall blowoff, inhibits plasma jet formation, and impedes plasma stagnation in the hohlraum interior. The potential roles of spontaneously generated electric and magnetic fields in the hohlraum dynamics and capsule implosion are discussed. It is shown that interpenetration of the two materials could result from the classical Rayleigh-Taylor instability occurring as the lighter, decelerating ionized fill gas pushes against the heavier, expanding gold wall blowoff. This experiment showed new observations of the effects of the fill gas on x-ray driven implosions, and an improved understanding of these results could impact the ongoing ignition experiments at the National Ignition Facility.National Laser User’s Facility (DE-FG52-07NA28059 and DE-FG03-03SF22691)Lawrence Livermore National Laboratory (B543881 and LDRD-08- ER-062)University of Rochester. Laboratory for Laser Energetics (414090-G)University of Rochester. Fusion Science Center (412761-G)General Atomics (DE-AC52-06NA 27279)Stewardship Science Graduate Fellowship (DE-FC52-08NA28752

Impeding Hohlraum Plasma Stagnation in Inertial-Confinement Fusion