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Creation of persistent, straight, 2 mm long laser driven channels in underdense plasmas
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View: Figures


Image of FIG. 1.
FIG. 1.

Simulated density profile at maximum compression of the coronal plasma surrounding the fuel for a typical HIPER baseline target (the electron density is given in terms of the critical density for 351 nm laser light). Solid vertical rectangle: density region studied by Li et al. (Ref. 18). Dashed rectangle: density region studied in the present experiment. Solid horizontal rectangle: density region where the stable channel was detected.

Image of FIG. 2.
FIG. 2.

(a) Schematic top-view of the experimental setup. (b) , . (c) , . (d) , . (e) , . All the radiographs refer to a probing proton energy of 4 MeV.

Image of FIG. 3.
FIG. 3.

(a) Energy of the accelerated electrons for , , and compared with the theoretical ponderomotive scaling. (b) Forward transmitted light spectrum for . No signature of self-modulation is visible.

Image of FIG. 4.
FIG. 4.

(a) 1D profile of the electric field distribution used, in cylindrical symmetry, as the input for the PT simulations. (b) Related electron density normalized to . (c) Dotted line: experimental proton modulation across the channel [refer to the solid line in Fig. 2(b) for the cross-cut direction]. Solid line: PT simulated proton density modulation. (d) Green triangles: experimental optical density modulation across the bifurcated region [refer to the dashed line in Fig. 2(b) for the cross-cut direction]. Thin solid line: optical density from the related PT simulation. Thick solid line: experimental electric field distribution as directly measured at the detector plane.

Image of FIG. 5.
FIG. 5.

Simulated ion density and laser electric field distribution for both the single [images (a) and (e)] and bifurcated regions [images (b) and (f)]. Images (c) and (d) show transverse crosscuts of images (a) and (b), respectively. All images refer to a simulation time of 20 ps.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Creation of persistent, straight, 2 mm long laser driven channels in underdense plasmas