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Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematics of the compression with the four long pulse beams (left) and of the cylindrical target (right).

Image of FIG. 2.
FIG. 2.

(Color online) X-ray radiography setup.

Image of FIG. 3.
FIG. 3.

(a) Photography of the target (1g/cc polymerized CH + 30% Cl doping in mass) before compression and (b) x-ray radiography of the same target during compression (at ). The white arrows highlight the compression region of the target. Both images have the same spatial scale.

Image of FIG. 4.
FIG. 4.

(Color online) Evolution of the target radius measured by x-ray radiography () for 1 g/cm3 targets with 30%-mass Cl doping (red triangles), compared to simulated x-ray transmission profile radii for three different LP laser beam energies: (gray dashed line), (blue solid line), and (black dotted line). The CH denser zone radius given by the hydrodynamic simulation is also represented (dotted dashed purple line).

Image of FIG. 5.
FIG. 5.

(Color online) Simulated transmission profiles at (left) and (right) for targets, doped with 30% Cl in mass (blue solid lines) or nondoped (blue dotted lines). The corresponding simulated density profiles are also plotted (green dashed lines). The gray background zones identify the zones containing Cl doping.

Image of FIG. 6.
FIG. 6.

(Color online) Hydrodynamic simulations mesh flow diagrams for (a) , (b) 0.3 g/cm3, and (c) 1 g/cm3 targets assuming of laser energy: The red curves represent the limit between the core and the shell. The plots below are the respective simulated temporal evolutions of the CH core density (blue solid lines) and temperature (red dotted lines), averaged over the entire CH core material for plots (d)–(f), and taken at from the center for plots (g)–(i).

Image of FIG. 7.
FIG. 7.

(Color online) Simulated density and temperature maps of (a) 0.1 g/cm3, (b) 0.3 g/cm3, and (c) 1 g/cm3 targets for laser energy at the respective stagnation times 1.9, 2.15, and 2.5 ns. The plots below represent the respective density (blue solid line) and temperature (red dotted line) profiles: Plots (d)–(f) correspond to lineouts of the 2D maps at , i.e., the probing direction, and (g)–(i) at i.e., one of LP laser beams axis.

Image of FIG. 8.
FIG. 8.

(Color online) (a) Diagram (n e , T e ) showing the three different plasma zones obtained at the central region of the cylindrical targets at stagnation according to initial density of the CH core. For comparison are plotted the points representing the required conditions for the compressed DT fuel in the HiPER design for FI. The solid line corresponds to the coupling parameter and the dashed line to the quantum degeneracy parameter E F /T e  = 1. (b) Density (dashed blue line) and temperature (solid green line) in the baseline HiPER target at the moment of stagnation (Refs. 3 and 37). The gray zone (also indicated by the arrow on the top) corresponds to the (, T) range achieved in our cylindrical compression experiment.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser-driven cylindrical compression of targets for fast electron transport study in warm and dense plasmas