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Target design for high fusion yield with the double Z-pinch-driven hohlrauma)
a)Paper BI2 2, Bull. Am. Phys. Soc. 51, 23 (2006).
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Image of FIG. 1.
FIG. 1.

(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.

Image of FIG. 2.
FIG. 2.

(Color) High-yield capsule schematic.

Image of FIG. 3.
FIG. 3.

(Color) Temperature history assumed for capsule design, with tolerable variations.

Image of FIG. 4.
FIG. 4.

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.)

Image of FIG. 5.
FIG. 5.

Capsule yield vs constant-in-time radiation asymmetry by mode. (A) Baseline capsule with fuel layer. (B) Alternate capsule with fuel layer.

Image of FIG. 6.
FIG. 6.

(Color) LASNEX setup for 2D simulations.

Image of FIG. 7.
FIG. 7.

Ideal Z-pinch x-ray power history and the running integral of the radiated energy for required three-step pulse.

Image of FIG. 8.
FIG. 8.

(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.

Image of FIG. 9.
FIG. 9.

(Color) (a) Shield ring schematic and (b) mapping onto space.

Image of FIG. 10.
FIG. 10.

(Color) modes vs shield angular extent for “” shields.

Image of FIG. 11.
FIG. 11.

(Color) Hohlraum configuration with optimum shields. The secondary entrance tamping foam is foam and the shield is with 3% Ge dopant.

Image of FIG. 12.
FIG. 12.

(Color) (a) Time-dependent and in ablation pressure for optimum shields. (b) DT fuel configuration near ignition time for capsule with 2D yield of .

Image of FIG. 13.
FIG. 13.

(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).

Image of FIG. 14.
FIG. 14.

(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.

Image of FIG. 15.
FIG. 15.

(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.


Generic image for table
Table I.

Characteristics and performance parameters for the baseline double Z-pinch capsule.

Generic image for table
Table II.

Predicted percentage of shots satisfying requirements for two high-yield capsule variations.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Target design for high fusion yield with the double Z-pinch-driven hohlrauma)