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Title: Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse

Abstract

The paper presents an analytical model and particle-in-cell simulations of the quasi-mono-energetic ion acceleration by an intense laser pulse in a multispecies target and the corresponding experimental observations. Homogeneous and heterogeneous targets are considered, and it is shown that the formation of the energy spectrum proceeds in three stages: (1) the initial light ion acceleration in the sheath electric field, (2) the ion species separation followed by the electrostatic shock formation, and (3) the interaction of spatially separated ion bunches accompanied by electron cooling. The field ionization of heavy ions and interaction between the heavy and light species play an important role in the formation and preservation of the energy spectrum of light ions. The simulation results are compared with the theoretical predictions and the experiments.

Authors:
; ; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5]
  1. Centre Lasers Intenses et Applications, UMR 5107 CEA - CNRS - Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence Cedex, France and P. N. Lebedev Physics Institute, Russian Academy of Science, Leninskii Prospect 53, Moscow 119991 (Russian Federation)
  2. (France)
  3. (Czech Republic)
  4. (Russian Federation)
  5. (Germany)
Publication Date:
OSTI Identifier:
20860450
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 13; Journal Issue: 12; Other Information: DOI: 10.1063/1.2404928; (c) 2006 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; BEAM-PLASMA SYSTEMS; ELECTRIC FIELDS; ELECTRON COOLING; ENERGY SPECTRA; HEAVY IONS; ICF DEVICES; INERTIAL CONFINEMENT; ION BEAMS; IONIZATION; LASERS; LIGHT IONS; LIGHT TRANSMISSION; PLASMA; PLASMA SHEATH; PLASMA SIMULATION; PLASMA WAVES; PULSES; SHOCK WAVES; TAIL IONS

Citation Formats

Brantov, A. V., Tikhonchuk, V. T., Klimo, O., Romanov, D. V., Ter-Avetisyan, S., Schnuerer, M., Sokollik, T., Nickles, P. V., Centre Lasers Intenses et Applications, UMR 5107 CEA - CNRS - Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence Cedex, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, CZ-115 19 Praha 1, Irkutsk State University of Means of Communication, Irkutsk 664074, and Max-Born-Institut, Berlin, Max-Born-Strasse 2a, D-12489, Berlin. Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse. United States: N. p., 2006. Web. doi:10.1063/1.2404928.
Brantov, A. V., Tikhonchuk, V. T., Klimo, O., Romanov, D. V., Ter-Avetisyan, S., Schnuerer, M., Sokollik, T., Nickles, P. V., Centre Lasers Intenses et Applications, UMR 5107 CEA - CNRS - Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence Cedex, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, CZ-115 19 Praha 1, Irkutsk State University of Means of Communication, Irkutsk 664074, & Max-Born-Institut, Berlin, Max-Born-Strasse 2a, D-12489, Berlin. Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse. United States. doi:10.1063/1.2404928.
Brantov, A. V., Tikhonchuk, V. T., Klimo, O., Romanov, D. V., Ter-Avetisyan, S., Schnuerer, M., Sokollik, T., Nickles, P. V., Centre Lasers Intenses et Applications, UMR 5107 CEA - CNRS - Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence Cedex, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, CZ-115 19 Praha 1, Irkutsk State University of Means of Communication, Irkutsk 664074, and Max-Born-Institut, Berlin, Max-Born-Strasse 2a, D-12489, Berlin. Fri . "Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse". United States. doi:10.1063/1.2404928.
@article{osti_20860450,
title = {Quasi-mono-energetic ion acceleration from a homogeneous composite target by an intense laser pulse},
author = {Brantov, A. V. and Tikhonchuk, V. T. and Klimo, O. and Romanov, D. V. and Ter-Avetisyan, S. and Schnuerer, M. and Sokollik, T. and Nickles, P. V. and Centre Lasers Intenses et Applications, UMR 5107 CEA - CNRS - Universite Bordeaux 1, 351, Cours de la Liberation, 33405 Talence Cedex and Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University, CZ-115 19 Praha 1 and Irkutsk State University of Means of Communication, Irkutsk 664074 and Max-Born-Institut, Berlin, Max-Born-Strasse 2a, D-12489, Berlin},
abstractNote = {The paper presents an analytical model and particle-in-cell simulations of the quasi-mono-energetic ion acceleration by an intense laser pulse in a multispecies target and the corresponding experimental observations. Homogeneous and heterogeneous targets are considered, and it is shown that the formation of the energy spectrum proceeds in three stages: (1) the initial light ion acceleration in the sheath electric field, (2) the ion species separation followed by the electrostatic shock formation, and (3) the interaction of spatially separated ion bunches accompanied by electron cooling. The field ionization of heavy ions and interaction between the heavy and light species play an important role in the formation and preservation of the energy spectrum of light ions. The simulation results are compared with the theoretical predictions and the experiments.},
doi = {10.1063/1.2404928},
journal = {Physics of Plasmas},
number = 12,
volume = 13,
place = {United States},
year = {Fri Dec 15 00:00:00 EST 2006},
month = {Fri Dec 15 00:00:00 EST 2006}
}
  • Generation of high-energy mono-energetic heavy ion beams by radiation pressure acceleration (RPA) of intense laser pulses is investigated. Different from previously studied RPA of protons or light ions, the dynamic ionization of high-Z atoms can stabilize the heavy ion acceleration. A self-organized, stable RPA scheme specifically for heavy ion beams is proposed, where the laser peak intensity is required to match with the large ionization energy gap when the successive ionization state passes the noble gas configurations [such as removing an electron from the helium-like charge state (Z−2){sup +} to (Z−1){sup +}]. Two-dimensional particle-in-cell simulations show that a mono-energetic Al{supmore » 13+} beam with peak energy 1.0 GeV and energy spread of only 5% can be obtained at intensity of 7×10{sup 20} W/cm{sup 2} through the proposed scheme. A heavier, mono-energetic, ion beam (Fe{sup 26+}) can attain a peak energy of 17 GeV by increasing the intensity to 10{sup 22} W/cm{sup 2}.« less
  • In recent experiments at the Trident laser facility, quasi-monoenergetic ion beams have been obtained from the interaction of an ultraintense, circularly polarized laser with a diamond-like carbon target of nm-scale thickness under conditions of ultrahigh laser pulse contrast. Kinetic simulations of this experiment under realistic laser and plasma conditions show that relativistic transparency occurs before significant radiation pressure acceleration and that the main ion acceleration occurs after the onset of relativistic transparency. Associated with this transition are a period of intense ion acceleration and the generation of a new class of ion solitons that naturally give rise to quasi-monoenergetic ionmore » beams. An analytic theory has been derived for the properties of these solitons that reproduces the behavior observed in kinetic simulations and the experiments.« less
  • Laser driven ion acceleration arises from charge separation effects caused by an ultrahigh intensity laser pulse. Limited mass targets confine the accelerated electrons within the target size and prevent the large area spreading seen in extended foil targets. Furthermore, if the target size is smaller than the laser wavelength and focal spot diameter, homogeneous heating of the target is ensured. Observation of quasi-monoenergetic protons in the interaction of a high intensity high contrast laser pulse at 5x10{sup 19} W/cm{sup 2} with 150 nm--diameter water droplets is investigated. An ensemble of such objects is formed in a spray. Quasi mono energeticmore » proton bursts of energy Eapprox1.6 MeV are observed and are associated with a specific ionization and explosion dynamics of the spheres.« less
  • MeV quasi-mono-energetic proton beam is produced by a combination of a synchronous radio frequency (rf) electric field and laser-plasma ion acceleration. The experiment was carried out at the Kansai Photon Science Institute, JAEA, using the Ti:Sapphire laser system called J-KAREN. The proton beam is emitted normal to the rear surface of the thin polyimide target of the thickness 7.5 {mu}m irradiated at peak intensity of 4x10{sup 18} W/cm{sup 2}. The energy spread is compressed from 100% to less than 11% at FWHM by the rf field. The focusing and defocusing effect of the transverse direction is also observed. These aremore » also studied by a Monte Carlo simulation. The relation between the transverse focusing and the energy spectrum of the phase-rotated beam is systematically shown by the simulation.« less
  • Particle-in-cell simulations are performed to study the acceleration of ions due to the interaction of a relativistic femtosecond laser pulse with a narrow thin target. The numerical results show that ions can be accelerated in a cascade by two electrostatic fields if the width of the target is smaller than the laser beam waist. The first field is formed in front of the target by the central part of the laser beam, which pushes the electron layer inward. The major part of the abaxial laser energy propagates along the edges to the rear side of the target and pulls outmore » some hot electrons from the edges of the target, which form another electrostatic field at the rear side of the target. The ions from the front surface are accelerated stepwise by these two electrostatic fields to high energies at the rear side of the target. The simulations show that the largest ion energy gain for a narrow target is about four times higher than in the case of a wide target.« less