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Initial cone-in-shell fast-ignition experiments on OMEGAa)
a)Paper TI3 1, Bull. Am. Phys. Soc. 55, 291 (2010).
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic of the integrated cone-in-shell fast-ignition experiment.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Photograph of a gold re-entrant cone target; (b) cross-sectional drawing through the shell and cone tip with target dimensions.

Image of FIG. 3.
FIG. 3.

(Color online) Drive laser pulse shape (Shot 55154).

Image of FIG. 4.
FIG. 4.

(Color online) (a) Schematic of the shock-breakout experiment. The CD shell was imploded using just the long-pulse, 351-nm drive beams, resulting in shock propagation through the tip of the cone. Emergence of the shock at the inside of the tip was diagnosed using an SOP and VISAR, (b) SOP trace for a typical shot, and (c) measured breakout time inside the cone for various tip thicknesses. The breakout is later for thicker cone tips.

Image of FIG. 5.
FIG. 5.

Sequence of density contours above 10 g/cm3 in the tip of an Au cone from a 2D SAGE simulation, showing the rapid propagation of a strong shock wave through a 15-μm cone tip. The fuel assembly from a cone-in-shell target (not shown) generates the shock. The shock propagates faster through the cone tip than through the wall.

Image of FIG. 6.
FIG. 6.

(Color online) (a) Schematic for simulations of radiation preheat of the cone tip. Coronal x-ray radiation from the shell driven by the strong UV pulse can penetrate through the cone wall, preheating the gold material. (b) Calculated electron temperature at the inside of the cone tip for 5 and 15 μm thicknesses. (c) VISAR trace for a 5 μm thickness, the disappearance of the fringes at ∼2.5 ns indicate preheat. The white arrow marks the optical emission at the shock-breakout time. (d) VISAR trace for a 15 μm thickness, showing no attenuation before shock breakout at 3.75 ns. The brace indicates the spatial range of the flat tip. In (c) and (d) the black curve indicates the laser’s temporal shape.

Image of FIG. 7.
FIG. 7.

(Color online) Time-of-flight spectra of 2.45 MeV neutrons from thermonuclear d(d,n)3He reactions in integrated fast-ignition experiments. Spectra with various timings of the OMEGA EP beam are shown for two target types.

Image of FIG. 8.
FIG. 8.

(Color online) Measured neutron yield as a function of the arrival time of the short-pulse laser for 10-μm (circles) and 40-μm (triangles) tip diameter cone targets. The gray area represents data without the short-pulse laser.

Image of FIG. 9.
FIG. 9.

(Color online) Fast-electron spectra measured in the laser’s forward direction and perpendicular to the laser direction (Shot 59124).

Image of FIG. 10.
FIG. 10.

(Color online) DRACO + LSP simulation for a 10-ps, 1.0-kJ, R 80 = 27-μm OMEGA EP pulse, showing contours of (a) plasma ion temperature and (b) neutron yield per unit volume, with and without hot electrons produced by the OMEGA EP pulse.

Image of FIG. 11.
FIG. 11.

(Color online) Electron-density contours from a 2D HYDRA simulation at the time of the short-pulse interaction of the preplasma formation in a gold cone with inner tip diameter of 10 μm.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Initial cone-in-shell fast-ignition experiments on OMEGAa)