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Mapping return currents in laser-generated Z-pinch plasmas using proton deflectometry
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Experimental geometry. The stalk symmetry axis makes an angle with the imaging axis which is necessary for net deflections due to B fields. Residual positive charge on the target creates a potential that drives a current I up the stalk. (b) Sample fusion proton spectrum. (c) An expanded view of the stalk assembly holding the target (not to scale). Approximate lengths (L) and outer diameters (OD) are listed for the boron (B) and silicon-carbide (SiC) fiber components. The approximate field of view is indicated by the dashed circle.

Image of FIG. 2.
FIG. 2.

(a) Synthetic proton radiographs. E and B fields are defined by a linear charge density and current I, respectively. (b) Fluence lineouts, indicated by arrows, of the second case in (a). The mean radii of distributed () and I () are shown and the widths () of the cylindrical annuli indicated by dotted lines. Qualitative lineout features are labeled.

Image of FIG. 3.
FIG. 3.

(a) The picketed laser pulse used on 35 m thick CH shells. Proton arrival times are shown by points lying on the time axis. (b) Proton fluence radiographs taken at four times relative to the laser drive where darker pixels designate higher fluence. The corresponding mean energy images are also shown where darker pixels indicate lower energy. (c) Comparison between synthetic (dashed) and experimental (solid) lineouts for the 1.1 ns image. (d) Comparison between synthetic (dashed) and experimental (solid) lineouts for the 2.4 ns image.

Image of FIG. 4.
FIG. 4.

Inferred values of current and charge characteristics as a function of time relative to laser onset. (a) Location and width of cylindrical annuli for currents and net charge plotted versus time. (b) Estimated inductance and resistance per unit length using the geometries shown in (a). (c) Inferred current I and charge density . (d) Corresponding peak field strengths.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mapping return currents in laser-generated Z-pinch plasmas using proton deflectometry