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Detailed characterization of the early x-ray emission of a plasma produced by point-like laser irradiation of solid Al targets
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10.1063/1.1987618
/content/aip/journal/pop/12/8/10.1063/1.1987618
http://aip.metastore.ingenta.com/content/aip/journal/pop/12/8/10.1063/1.1987618
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup for the time-resolved study of the plasma x-ray emission. The two main diagnostics, namely, the time-integrating and the time-resolving Bragg spectrometers, are clearly visible inside the interaction chamber. In the inset the geometrical arrangement of the Al cylindrical target is shown: the main axis of the target is tilted by 20° with respect to the vertical direction in order to enable a simultaneous detection by the two symmetric x-ray spectrometers and, at the same time, to avoid harmful back reflections of the laser beam.

Image of FIG. 2.
FIG. 2.

X-ray-emission spectrum of the produced plasma, obtained using the time-integrating spectrometer.

Image of FIG. 3.
FIG. 3.

Mass density map of the Al plasma produced by a tightly focused laser pulse at its intensity peak as calculated by the 2D hydrodynamic code POLLUX. The laser intensity used for the simulation is and the Gaussian beam waist is . The initial position of the target surface is located at and the laser beam impinges from the right.

Image of FIG. 4.
FIG. 4.

Electron temperature map of the Al plasma in the same conditions as of Fig. 3.

Image of FIG. 5.
FIG. 5.

(Color online). Calculated 2D maps of the x-ray emission at the emission wavelength at different times with respect to the peak of the laser pulse. Each frame corresponds to a different time with respect to the peak of the laser pulse, located at frame No. 13. The time interval between successive frames is , so that frame No. 1 (No. 25) corresponds to before (after) the pulse peak. The horizontal scale goes from , the original target surface being located at and the laser beam impinging from the right. The vertical scale ranges from . The intensity is normalized to the maximum of the and the emissivity during the whole pulse duration.

Image of FIG. 6.
FIG. 6.

(Color online). Calculated 2D maps of the x-ray emission at the line at different times with respect to the peak of the laser pulse. Each frame corresponds to a different time with respect to the peak of the laser pulse, located at frame No. 13. The time interval between successive frames is , so that frame No. 1 (No. 25) corresponds to before (after) the pulse peak. The horizontal scale goes from , the original target surface being located at and the laser beam impinging from the right. The vertical scale ranges from . The intensity is normalized to the maximum of the and the emissivity during the whole pulse duration.

Image of FIG. 7.
FIG. 7.

Calculated maximum local values, as taken from each frame of the maps of Figs. 5 and 6, of the emissivity for the and lines as a function of time. The relative intensity of the incident laser pulse is also shown.

Image of FIG. 8.
FIG. 8.

Calculated history of the electron temperature of the region where the emission of the line is maximum. The relative intensity of the incident laser pulse is also shown.

Image of FIG. 9.
FIG. 9.

Calculated history of the electron density of the region where the emission of the line is maximum. The relative intensity of the incident laser pulse is also shown.

Image of FIG. 10.
FIG. 10.

-to- intensity ratio as calculated by the code FLY in time-dependent conditions using a plasma slab whose size as a function of time is taken from the width of the longitudinal profile of the He-like ion ground-state population. The experimental values of the ratio obtained from time-resolved x-ray spectroscopy are also shown.

Image of FIG. 11.
FIG. 11.

Profile of the component along the line of sight of the fluid velocity of the plasma as provided by the code POLLUX at the peak of the laser pulse. The vertical line marks the point at which the maximum of the line emission occurs.

Image of FIG. 12.
FIG. 12.

Probability of a photon at the wavelength to be reabsorbed in the plasma as calculated using formula (2). is the coordinate along the line of sight of the plasma and passing through the longitudinal position (marked by the vertical line) where, according to Fig. 5, the emission at the wavelength exhibits a maximum.

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/content/aip/journal/pop/12/8/10.1063/1.1987618
2005-08-12
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Detailed characterization of the early x-ray emission of a plasma produced by point-like laser irradiation of solid Al targets
http://aip.metastore.ingenta.com/content/aip/journal/pop/12/8/10.1063/1.1987618
10.1063/1.1987618
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