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Stabilization of thin-shell implosions using a high-foot adiabat-shaped drive at the National Ignition Facility

The thin-shell adiabat-shaped implosions proposed in this paper are designed to combine the ablation front stability benefits of the High Foot (HF) pulses with the demonstrated high fuel compressibility of the low foot implosions to reach the alpha-heating regime. This is accomplished by both lowering the drive between the first and second shocks and tailoring the rise-to-peak drive. Two-dimensional radiation hydrodynamics simulations show that while weakening the growth of low-mode number perturbations at the ablation front, this approach also introduces negative lobes to the growth factor spectrum at high mode numbers. A very-high foot picketless drive, characterized by an intermediate fuel adiabat level, is proposed to suppress negative perturbation growth. Moreover, the picketless feature of this design and the shorter duration of the through reduce the hohlraum wall motion allowing us to keep the capsule implosion symmetry under control. Introducing an accurately tuned dopant fraction in the outer ab...