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Title: Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses

Abstract

The acceleration of protons in dense plastic foils irradiated by ultrahigh intensity laser pulses is simulated using a two-dimensional hybrid particle-in-cell scheme. For the chosen parameters of the overdense foils of densities {rho}=0.2, 1, and 3 g/cm{sup 3} and of an ultrahigh intensity (2x10{sup 20} W/cm{sup 2}) laser pulse, our simulations illustrate that a high-density target is favorable to high collimation of the target-normal-sheath acceleration protons but less energy for a short acceleration time (<100 fs). In particular, the difference of strong local heating of the carbon ion for different plasma densities is clearly observed at both the front and rear surfaces of thin solid targets, suggesting that the effect of the density and composition of the targets are also important for correctly simulating energetic ion generation in ultraintense laser-solid interactions.

Authors:
; ;  [1];  [2];  [3];  [2];  [2];  [2]
  1. Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088 (China)
  2. (China)
  3. (Germany)
Publication Date:
OSTI Identifier:
20982876
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 10; Other Information: DOI: 10.1063/1.2730565; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; CARBON; CARBON IONS; FOILS; IRRADIATION; LASERS; PLASMA DENSITY; PLASMA HEATING; PLASMA SHEATH; PLASMA SIMULATION; PROTONS; PULSES; TAIL IONS; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Zhou, C. T., Yu, M. Y., He, X. T., Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institut fuer Theoretische Physik I, Ruhr-Universitaet Bochum, D-44780 Bochum, Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027. Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses. United States: N. p., 2007. Web. doi:10.1063/1.2730565.
Zhou, C. T., Yu, M. Y., He, X. T., Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institut fuer Theoretische Physik I, Ruhr-Universitaet Bochum, D-44780 Bochum, Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, & Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027. Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses. United States. doi:10.1063/1.2730565.
Zhou, C. T., Yu, M. Y., He, X. T., Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institut fuer Theoretische Physik I, Ruhr-Universitaet Bochum, D-44780 Bochum, Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027. Tue . "Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses". United States. doi:10.1063/1.2730565.
@article{osti_20982876,
title = {Density effect on proton acceleration from carbon-containing high-density thin foils irradiated by high-intensity laser pulses},
author = {Zhou, C. T. and Yu, M. Y. and He, X. T. and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 and Institut fuer Theoretische Physik I, Ruhr-Universitaet Bochum, D-44780 Bochum and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 and Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088 and Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027},
abstractNote = {The acceleration of protons in dense plastic foils irradiated by ultrahigh intensity laser pulses is simulated using a two-dimensional hybrid particle-in-cell scheme. For the chosen parameters of the overdense foils of densities {rho}=0.2, 1, and 3 g/cm{sup 3} and of an ultrahigh intensity (2x10{sup 20} W/cm{sup 2}) laser pulse, our simulations illustrate that a high-density target is favorable to high collimation of the target-normal-sheath acceleration protons but less energy for a short acceleration time (<100 fs). In particular, the difference of strong local heating of the carbon ion for different plasma densities is clearly observed at both the front and rear surfaces of thin solid targets, suggesting that the effect of the density and composition of the targets are also important for correctly simulating energetic ion generation in ultraintense laser-solid interactions.},
doi = {10.1063/1.2730565},
journal = {Journal of Applied Physics},
number = 10,
volume = 101,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Ion acceleration resulting from the interaction of ultra-high intensity (2 x 10{sup 20 }W/cm{sup 2}) and ultra-high contrast ({approx}10{sup 10}) laser pulses with 0.05-10 {mu}m thick Al foils at normal (0 deg.) and 35 deg. laser incidence is investigated. When decreasing the target thickness from 10 {mu}m down to 0.05 {mu}m, the accelerated ions become less divergent and the ion flux increases, particularly at normal (0 deg.) laser incidence on the target. A laser energy conversion into protons of {approx}6.5% is estimated at 35 deg. laser incidence. Experimental results are in reasonable agreement with theoretical estimates and can be amore » benchmark for further theoretical and computational work.« less
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  • No abstract prepared.
  • In the last few years, intense research has been conducted on the topic of laser-accelerated ion sources and their applications. Ultra-bright beams of multi-MeV protons are produced by irradiating thin metallic foils with ultra-intense short laser pulses. These sources open new opportunities for ion beam generation and control, and could stimulate development of compact ion accelerators for many applications, in particular proton therapy of deep-seated tumours. Here we show that scaling laws deduced from fluid models reproduce well the acceleration of proton beams for a large range of laser and target parameters. These scaling laws show that, in our regime,more » there is an optimum in the laser pulse duration of {approx}200 fs-1 ps, with a needed laser energy level of 30 to 100 J, in order to achieve e.g. 200 MeV energy protons necessary for proton therapy.« less
  • Results of experiments on proton acceleration from aluminum foils and organic films irradiated by laser pulses with intensities of up to 2 x 10{sup 19} W/cm{sup 2} are presented. To prevent thin targets from destruction by the superluminescence prepulse, a fast light shutter based on a Pockels cell was introduced in the amplifying system of the SOKOL-P facility. As a result, the energy contrast with respect to the superluminescence prepulse increased to 4 x 10{sup 6}, which made it possible to carry out experiments on the irradiation of targets with thicknesses less than 100 nm. It is found that themore » target material insignificantly affects the yield of accelerated protons.« less