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2D particle-in-cell simulations of ion acceleration in laser irradiated submicron clusters including field ionization
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10.1063/1.4704791
/content/aip/journal/pop/19/4/10.1063/1.4704791
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/4/10.1063/1.4704791
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Spatial distribution of the averaged charge Z of oxygen ions in the expanding cluster after the interaction with 40 fs laser pulse (at simulation time t = , where is the laser wave period). The initial cluster size of 150 nm is increased during the interaction, depending on the laser amplitude . The initial position of the target center is at x = 0, y = 0. Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “Field ionization effects on ion acceleration in laser-irradiated clusters,” Nucl. Instrum. Methods Phys. Res. A 653, 109–112 (2011). Copyright © 2011 by Elsevier.

Image of FIG. 2.
FIG. 2.

Temporal evolution of the average charge of oxygen ions in the simulations of the interaction of 40 fs laser pulses of various amplitudes with the cluster of diameter of 150 nm. The laser pulse interacts with the cluster from to , where is the laser wave period.

Image of FIG. 3.
FIG. 3.

Electron density distributions during laser-target interaction for simulation cases with laser pulse amplitudes and . The laser pulse interacts with the cluster from to , where is the laser wave period. The initial cluster size is 150 nm, initial position of the target center is at x = 0, y = 0.

Image of FIG. 4.
FIG. 4.

Proton energy distribution functions at the end of simulations (50 fs after the moment when the laser pulse interaction with clusters stops) for laser amplitudes and . Only protons in the sector of the angle of are taken into account in the direction parallel and perpendicular to the laser beam propagation direction. Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “PIC simulations of ion acceleration in laser irradiated submicron droplets,” Proc. SPIE 8079, 807912 (2011). Copyright © 2011 by SPIE—The International Society of Optical Engineering.

Image of FIG. 5.
FIG. 5.

(a) Total absorption of the laser pulse energy during laser-cluster interaction vs. laser pulse amplitude ; (b) maximum energy of accelerated protons at the end of simulation runs vs. laser pulse amplitude . The pulse duration is 40 fs.

Image of FIG. 6.
FIG. 6.

(a) Dependence of the total absorption of laser pulse energy in cluster plasma on the initial target diameter. (b) Dependence of maximum proton energy on the target diameter. The pulse duration is 40 fs.

Image of FIG. 7.
FIG. 7.

Energy spectra of accelerated protons from ionized water microdroplets of initial diameter in the range from 75 nm to and for 40 fs laser pulse of . Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “PIC simulations of ion acceleration in laser irradiated submicron droplets,” Proc. SPIE 8079, 807912 (2011). Copyright © 2011 by SPIE—The International Society of Optical Engineering.

Image of FIG. 8.
FIG. 8.

(a) Dependence of total absorption of the laser pulse energy in cluster plasma on the pulse duration. (b) Dependence of maximum proton energy on the laser pulse duration. The initial cluster diameter is 150 nm. Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “PIC simulations of ion acceleration in laser irradiated submicron droplets,” Proc. SPIE 8079, 807912 (2011). Copyright © 2011 by SPIE—The International Society of Optical Engineering.

Image of FIG. 9.
FIG. 9.

Initial density profiles of cluster plasma: (a) step-like density profile, (b) exponential density profile with inner plasma core, (c) underdense cluster with exponential density profile. Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “PIC simulations of ion acceleration in laser irradiated submicron droplets,” Proc. SPIE 8079, 807912 (2011). Copyright © 2011 by SPIE—The International Society of Optical Engineering.

Image of FIG. 10.
FIG. 10.

(a) Dependence of total absorption of the laser pulse energy in cluster plasma on the cluster density scale length L (maximum density of exponential profile depends on L as the cluster mass is constant). (b) Dependence of maximum proton energy on the cluster density scale length. All simulations are calculated for the laser pulse amplitude and the pulse duration 40 fs. Maximum initial plasma density in the target center is , and , respectively, for characteristic scale length , and . Reprinted with permission from J. Psikal, O. Klimo, and J. Limpouch, “PIC simulations of ion acceleration in laser irradiated submicron droplets,” Proc. SPIE 8079, 807912 (2011). Copyright © 2011 by SPIE—The International Society of Optical Engineering.

Image of FIG. 11.
FIG. 11.

Instantaneous electric fields during laser cluster interaction for the laser pulse amplitude at simulation time t =  (a) for cluster initialized with step-like density profile; (b) for cluster initialized with exponential density profile with scale length . The laser pulse interacts with the cluster from to , where is the laser wave period.

Image of FIG. 12.
FIG. 12.

Temporal evolution of spatially averaged charge of oxygen ions in the simulations of the interaction of laser pulses of the amplitude with cluster of step-like and exponential density profiles with various scale lengths. The laser pulse interacts with the cluster from to , where is the laser wave period.

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2012-04-19
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: 2D particle-in-cell simulations of ion acceleration in laser irradiated submicron clusters including field ionization
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/4/10.1063/1.4704791
10.1063/1.4704791
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