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Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing
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10.1063/1.3688027
/content/aip/journal/apl/100/8/10.1063/1.3688027
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/8/10.1063/1.3688027
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) Energy spectra of proton beams with high contrast (10−8) and low contrast (10−6) laser pulses for the tight focus on 50 nm Al foils.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Energy spectra of proton beams for 50 nm Al foils vs. laser intensities (focal offsets) for low contrast (10−6) laser pulses. Laser energy is kept as constant. (b) The E cutoff of proton beams vs. varied focal intensities for 50 nm (black star) and 2 μm (red dot) foils.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Schematics of the ion beam footprint imaging system, which measures the spatial distribution of the lower part of the ion beam. The detector is covered by a set of filters with different thickness, which provides a rough energy resolution. (b) The spatial distributions of the proton beams from 50 nm foils for varied laser intensities. All the images are under the same color scale. The black gap shown in each image is due to the proton fluence reduction by the filters.

Image of FIG. 4.
FIG. 4.

(Color online) The proton dose of the whole beam under varied laser intensities.

Image of FIG. 5.
FIG. 5.

(Color online) (a) Experimental energy spectra of hot electrons in the forward direction at the laser intensities of 4.8 × 1019 W/cm2 (black line) and 1.6 × 1017 W/cm2 (red line). (b) Simulated energy spectra of hot electrons when the target is at the best focal position (black square) and 27λ away from the best focal position (red star) at t = 30T0.

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/content/aip/journal/apl/100/8/10.1063/1.3688027
2012-02-21
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Enhancement of ion generation in femtosecond ultraintense laser-foil interactions by defocusing
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/8/10.1063/1.3688027
10.1063/1.3688027
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