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How well do time-integrated Kα images represent hot electron spatial distributions?
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10.1063/1.3609819
/content/aip/journal/pop/18/7/10.1063/1.3609819
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/7/10.1063/1.3609819
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Simulation geometry for the slab target (left) and the buried cone target (right). The black line indicates the solid density contour, the grey line the simulation grid. The color scale on the right shows electron number density in cm−3 (log scale). The laser is incident from the left and focused at the origin.

Image of FIG. 2.
FIG. 2.

(Color online) Kα signal as a function of transverse position z for several times during the run using the slab target. These Kα “images” were taken at x = 0 μm, the start of solid density. Note the growth of wings at late times.

Image of FIG. 3.
FIG. 3.

(Color online) Kα signal as a function of transverse position z for several times during the run using the slab target. The depth was x = 100 μm, well into the target. Substantial wings develop earlier.

Image of FIG. 4.
FIG. 4.

(Color online) Time evolution of fast electrons with energies between 1 and 1.5 MeV for a short, 55 fs pulse incident on the slab target. Higher energy electrons have similar structure. Red particles have positive px, blue have negative. The thin black line indicates the solid density contour of the target. The grey line at x = 100 μm depth into the target with black shading illustrates the “first pass” analysis described in the text.

Image of FIG. 5.
FIG. 5.

(Color online) Like Fig. 4, but for a buried cone target.

Image of FIG. 6.
FIG. 6.

(Color online) Evolution of the y-component of the magnetic field in Gauss at various times for the slab (top graphs) and the buried cone (bottom graphs) using a short, 55 fs pulse. The selected times are different for the two cases to account for the longer time required by the laser to reach the buried cone tip. The field strength is given using a sign preserving color log scale. The black line shows the solid density contour and the white line marks the non-relativistic critical density.

Image of FIG. 7.
FIG. 7.

(Color online) Electron fluence as a function of transverse position in the slab target using a short, 55 fs pulse: (black) “first pass” only electrons with energy above 1 MeV and (red) all electrons above 8 KeV integrated over time. Two target depths, (a) x = 0 μm and (b) x = 100 μm. The first pass electron signal has been scaled by the indicated factor to facilitate comparison.

Image of FIG. 8.
FIG. 8.

(Color online) Like Fig. 7, but for a buried cone target.

Image of FIG. 9.
FIG. 9.

(Color online) Kα signal (red/light gray) and electron fluence for forward going electrons with energy above 1 MeV (black) as a function of transverse position in the slab target, normalized to unity at a depth of (a) x = 0 μm and (b) x = 100 μm into the target.

Image of FIG. 10.
FIG. 10.

(Color online) Like Fig. 9 but each signal has been convolved with a 10 μm (FWHM) Lorentzian device response function.

Image of FIG. 11.
FIG. 11.

(Color online) Like Fig. 10 but using the buried cone target.

Image of FIG. 12.
FIG. 12.

(Color online) Kα and hot electron spot sizes (half-width at half-maximum—HWHM) in the slab target. Results are shown both with and without convolving with a 10 μm device function. The beam divergence (half-angle) is given as determined by fitting to the spot sizes up to a 150 μm depth.

Image of FIG. 13.
FIG. 13.

(Color online) Like Fig. 12, but for a buried cone target.

Image of FIG. 14.
FIG. 14.

(Color online) Like Fig. 9 but with the electron signal containing both forward and backward going electrons for the slab target.

Image of FIG. 15.
FIG. 15.

(Color online) Like Fig. 14 but for the buried cone target.

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/content/aip/journal/pop/18/7/10.1063/1.3609819
2011-07-22
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: How well do time-integrated Kα images represent hot electron spatial distributions?
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/7/10.1063/1.3609819
10.1063/1.3609819
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