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High-intensity laser interactions with mass-limited solid targets and implications for fast-ignition experiments on OMEGA EPa)
a)Paper JI2 5, Bull. Am. Phys. Soc. 51, 137 (2006).
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Refluxing efficiency obtained from the capacitance model. The hot-electron temperature is assumed to depend on laser intensity according to the ponderomotive scaling (see Ref. 6).

Image of FIG. 2.
FIG. 2.

(Color online) production efficiency versus laser intensity for -thick foils. The semi-analytic model with refluxing and a 10% hot-electron conversion efficiency (lower solid line) agrees with the LSP calculation (circles) and the experimental data (triangles). Also shown are the model predictions with no refluxing (dashed lines). The predictions, and not the data, have been corrected for re-absorption in the target.

Image of FIG. 3.
FIG. 3.

(Color online) Experimental (red solid) and (blue open) production efficiency as a function of laser intensity for both the 100-TW laser system (crosses) and the PW laser for short pulses (squares) and long pulses (diamonds). Only targets having a volume greater than are shown.

Image of FIG. 4.
FIG. 4.

(Color online) Experimental production efficiency from the 100-TW system (crosses) and PW laser system with short pulses (squares) and long pulses (diamonds) as a function of laser intensity. The predictions of the semi-analytic model with hot-electron conversion efficiencies taken from a fit to Nova PW data are indicated by the red area bounded by dashed lines. The solid blue curves are lines of constant hot-electron conversion efficiency.

Image of FIG. 5.
FIG. 5.

(Color online) Reduction in the ratio of to total -emission probability as a function of plasma temperature, based on the Thomas-Fermi average ionization state (inset).

Image of FIG. 6.
FIG. 6.

(Color online) The images show target heating from four three-dimensional LSP calculations on a slice perpendicular to the target normal taken at a depth of from the target surface. The heating was computed with 10 and of energy in hot electrons (columns) and for target volumes of and (rows). Only one quadrant of each foil was modeled, the remainder completed by assuming symmetry about the and axes.

Image of FIG. 7.
FIG. 7.

(Color online) Experimental ratio of to yield from the RAL 100-TW (crosses) and RAL PW (squares, diamonds, and circles) as a function of target volume. The open diamonds show LSP predictions in the cases of of energy in hot electrons (upper light blue) and (lower dark red).

Image of FIG. 8.
FIG. 8.

(Color online) Image of emission obtained from three-dimensional LSP calculations.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-intensity laser interactions with mass-limited solid targets and implications for fast-ignition experiments on OMEGA EPa)