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Multistage ion acceleration in finite overdense target with a relativistic laser pulse
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10.1063/1.4817026
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1 Institute for Plasma Research, Bhat, Gandhinagar 382428, India
Phys. Plasmas 20, 073116 (2013)
/content/aip/journal/pop/20/7/10.1063/1.4817026
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/7/10.1063/1.4817026
View: Figures

## Figures

FIG. 1.

Spatial density profile of ions at different times for and . In (a), the ion density at time is shown, i.e., when the face of the laser pulse is at the extreme left of the simulation domain and the ions are undisturbed. (b) Shows the ion density profile at . We can notice here that the tail of the plasma is at hence indicating that all the ions have passed through the accelerating field generated by the double layer by this time. (c) and (d) shows ion densities at and , respectively, from which we can see that the ions have been further displaced leading to a indication of multistage acceleration process.

FIG. 2.

Figures (a), (c), and (e) show the longitudinal electric field at times , and , respectively, for and . (b), (d), and (f) show the proton energy spectrum at similar times. We see that at , the ions peak at energy 30.25 MeV. At , we can see a second peak emerging at 90.5 MeV to which almost all the ions get dumped at .

FIG. 3.

Spatial density profile of ions at different times for and . In (a), the ion density at time is shown, i.e., when the face of the laser pulse is at the extreme left of the simulation domain and the ions are undisturbed. (b) Shows the ion density profile at . We can notice here that the tail of the plasma is at hence indicating that all the ions have passed through the accelerating field generated by the double layer by this time. (c) and (d) shows ion densities at and , respectively, from which we can see that the ions have been further displaced leading to a indication of multistage acceleration process.

FIG. 4.

Figures (a), (c), and (e) show the longitudinal electric field at times , and , respectively, for and . (b), (d), and (f) shows the proton energy spectrum at similar times. We see that at , the ions peak at energy 62.5 MeV. At , we can see a second peak at 180 MeV.

FIG. 5.

Plots of and stage ion kinetic energy of accelerated ions for . The analytical results are represented by solid lines and the dots and circles represent first and second stage velocities, respectively. The broken lines are the non-relativistic results.

FIG. 6.

Plots of and stage ion kinetic energy of accelerated ions for . The analytical results are represented by solid lines and the dots and circles represent first and second stage velocities, respectively. The broken lines are the non-relativistic results.

FIG. 7.

Filtered proton energy spectrum at different time periods.

FIG. 8.

Ion distribution of the central slice of the plasma at different times.

/content/aip/journal/pop/20/7/10.1063/1.4817026
2013-07-30
2014-04-17

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