(Color) Double Z-pinch hohlraum concept. (A) and (B) top and bottom primary hohlraums, containing notional wire array Z pinch with internal pulse-shaping targets. (C) High-yield capsule, (D) secondary hohlraum containing the capsule, (E) on-axis permanent shine shield and radial spoke electrode structures, and (F) upper and lower electrical power feeds.
(Color) High-yield capsule schematic.
(Color) Temperature history assumed for capsule design, with tolerable variations.
Capsule yield vs rms surface roughness for multimode simulations. (The vertical band is the NIF specification for outer Be surface roughness for modes 12 and greater.)
Capsule yield vs constant-in-time radiation asymmetry by mode. (A) Baseline capsule with fuel layer. (B) Alternate capsule with fuel layer.
(Color) LASNEX setup for 2D simulations.
Ideal Z-pinch x-ray power history and the running integral of the radiated energy for required three-step pulse.
(Color) Time-dependent and Legendre modes of the ablation pressure along with the spatially averaged time-dependent radiation temperature sampled at radii of 1.3–1.6 times the initial capsule radius, for the hohlraum configuration of Fig. 7.
(Color) (a) Shield ring schematic and (b) mapping onto space.
(Color) modes vs shield angular extent for “” shields.
(Color) Hohlraum configuration with optimum shields. The secondary entrance tamping foam is foam and the shield is with 3% Ge dopant.
(Color) (a) Time-dependent and in ablation pressure for optimum shields. (b) DT fuel configuration near ignition time for capsule with 2D yield of .
(Color) Percentage of double-pinch experiments providing a given level of asymmetry, for: (A) and (nominal reproducibility and hohlraum smoothing), (B) and (increased reproducibility), and (C) and (increased reproducibility and smoothing).
(Color) Schematic of low-Z multicomponent Z-pinch load being considered for use in the high-yield concept. The precise masses and radii of the various components are design parameters that are varied to tune the timing and level of multiple radiation pulses.
(Color) Single-feed double Z-pinch geometry in which electrical power is delivered by a midplane disk feed to two Z pinches in series. The secondary entrance foams and shields are also shown in this figure.
Characteristics and performance parameters for the baseline double Z-pinch capsule.
Predicted percentage of shots satisfying requirements for two high-yield capsule variations.
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