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Title: Focusing of high-current laser-driven ion beams

Abstract

Using a two-dimensional relativistic hydrodynamic code, it is shown that a dense high-current ion beam driven by a short-pulse laser can be effectively focused by curving the target front surface. The focused beam parameters essentially depend on the density gradient scale length of the preplasma L{sub n} and the surface curvature radius R{sub T}. When L{sub n}{<=}0.5{lambda}{sub L} ({lambda}{sub L} is the laser wavelength) and R{sub T} is comparable with the laser beam aperture d{sub L}, a significant fraction of the accelerated ions is focused on a spot much smaller than d{sub L}, which results in a considerable increase in the ion fluence and current density. Using high-contrast multipetawatt picosecond laser pulses of relativistic intensity ({approx}10{sup 20} W/cm{sup 2}), focused ion (proton) current densities approaching those required for fast ignition of DT fuel seem to be feasible.

Authors:
;  [1]
  1. Institute of Plasma Physics and Laser Microfusion, EURATOM Association, Warsaw 00-908 (Poland)
Publication Date:
OSTI Identifier:
20960204
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 90; Journal Issue: 15; Other Information: DOI: 10.1063/1.2721394; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 07 ISOTOPES AND RADIATION SOURCES; BEAM-PLASMA SYSTEMS; CURRENT DENSITY; FOCUSING; ION BEAMS; LASERS; PLASMA; PLASMA DENSITY; PLASMA SIMULATION; PULSES; RELATIVISTIC RANGE; TWO-DIMENSIONAL CALCULATIONS

Citation Formats

Badziak, J., and Jablonski, S. Focusing of high-current laser-driven ion beams. United States: N. p., 2007. Web. doi:10.1063/1.2721394.
Badziak, J., & Jablonski, S. Focusing of high-current laser-driven ion beams. United States. doi:10.1063/1.2721394.
Badziak, J., and Jablonski, S. Mon . "Focusing of high-current laser-driven ion beams". United States. doi:10.1063/1.2721394.
@article{osti_20960204,
title = {Focusing of high-current laser-driven ion beams},
author = {Badziak, J. and Jablonski, S.},
abstractNote = {Using a two-dimensional relativistic hydrodynamic code, it is shown that a dense high-current ion beam driven by a short-pulse laser can be effectively focused by curving the target front surface. The focused beam parameters essentially depend on the density gradient scale length of the preplasma L{sub n} and the surface curvature radius R{sub T}. When L{sub n}{<=}0.5{lambda}{sub L} ({lambda}{sub L} is the laser wavelength) and R{sub T} is comparable with the laser beam aperture d{sub L}, a significant fraction of the accelerated ions is focused on a spot much smaller than d{sub L}, which results in a considerable increase in the ion fluence and current density. Using high-contrast multipetawatt picosecond laser pulses of relativistic intensity ({approx}10{sup 20} W/cm{sup 2}), focused ion (proton) current densities approaching those required for fast ignition of DT fuel seem to be feasible.},
doi = {10.1063/1.2721394},
journal = {Applied Physics Letters},
number = 15,
volume = 90,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2007},
month = {Mon Apr 09 00:00:00 EDT 2007}
}