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Evidence for ultra-fast heating in intense-laser irradiated reduced-mass targets
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic of the experimental setup. The insets show (top) the focal intensity distribution and (bottom) the image of the irradiated droplet in the VUV.

Image of FIG. 2.
FIG. 2.

X-ray spectra emitted by the laser-irradiated droplet at a laser energy of 2.4 J (a), and ∼0.01 J (b). Lineouts in (c), dashed lines show tabulated line positions.

Image of FIG. 3.
FIG. 3.

(left) Spectra as in Fig. 2 (red/thick: 2.4 J laser energy, blue/dashed: 0.01 J) in the spectral region below 3100 eV, with KL-transitions of argon at different charge states [Refs. 18 and 19]. (right) Average charge state (line) and FWHM of ionization distribution (shaded) vs. temperature, calculated by FLYCHK.

Image of FIG. 4.
FIG. 4.

(a) Spectrum at 2.4 J laser energy (red), together with best fit (blue) obtained with FLYCHK. (b) Weights of the spectra at different temperatures to obtain the fit in Fig. 4(a).

Image of FIG. 5.
FIG. 5.

(a) K-alpha intensity (solid lines) and bulk target temperature evolution (dashed lines) for hot-electron temperatures of T hot = 0.25, 0.5, and 1 MeV (blue, green, red, respectively), as calculated by the collisional model. (b) Space- and time-integrated K-alpha yields obtained at different bulk target temperatures. Solid lines/filled symbols (dashed lines/open symbols) for a total K-alpha yield of 8 × 1010 (1.6 × 1011) photons.

Image of FIG. 6.
FIG. 6.

(a) Bulk target temperature evolution for T hot, = 0.5 MeV, calculated by the model including resistive heating (solid, thick). For comparison, the result from the collisional-only model is shown (solid, thin). (b) K-alpha yields obtained at different bulk target temperatures, as calculated by thetwo models for T hot = 0.5, MeV (thick: collisional + resistive, thin: collisional only). The solid and dashed lines are for a total K-alpha yield of 8 × 1010 and 1.6 × 1011 photons, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Evidence for ultra-fast heating in intense-laser irradiated reduced-mass targets