The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
S. S. Bulanov - One of the best experts on this subject based on the ideXlab platform.
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Strong field electrodynamics of a Thin Foil
AIP Conference Proceedings, 2017Co-Authors: S. S. Bulanov, S. Rykovanov, C B Schroeder, E Esarey, Masaki Kando, T. Zh. Esirkepov, Francesco Pegoraro, W P LeemansAbstract:Exact solutions describing the nonlinear electrodynamics of a Thin double layer Foil are presented. These solutions correspond to a broad range of problems of interest for the interaction of high intensity laser pulses with overdense plasmas such as frequency upshifting, high order harmonic generation and high energy ion acceleration.
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ion acceleration from Thin Foil and extended plasma targets by slow electromagnetic wave and related ion ion beam instability
Physics of Plasmas, 2012Co-Authors: C B Schroeder, E Esarey, S. S. Bulanov, Masaki Kando, Francesco Pegoraro, Zh T Esirkepov, C G R Geddes, W P LeemansAbstract:When ions are accelerated by the radiation pressure of a laser pulse, their velocity cannot exceed the pulse group velocity which can be considerably smaller than the speed of light in vacuum. This is demonstrated in two cases corresponding to a Thin Foil target irradiated by high intensity laser light and to the hole boring produced in an extended plasma by the laser pulse. It is found that the beams of accelerated ions are unstable against Buneman-like and Weibel-like instabilities which results in the broadening of the ion energy spectrum.
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generation of high energy attosecond pulses by the relativistic irradiance short laser pulse interacting with a Thin Foil
Physics Letters A, 2006Co-Authors: S. S. Bulanov, T. Zh. Esirkepov, A S Pirozhkov, Michiaki Mori, A Sagisaka, Hiroyuki DaidoAbstract:When a Thin Foil target is irradiated by two laser pulses, or it is irradiated by one pulse under the condition when the charge separation electric field exceeds the laser field, the electron motion in the direction perpendicular to the target surface is suppressed. Electrons can only slide along the Foil. Using an analytical model, we describe the new regime of attosecond pulse generation by the relativistic-irradiance short laser pulse interacting with the sliding mirror. Pulses with the duration of few hundred attoseconds can be generated with the conversion efficiency up to few percents.
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On the theory of ionization of a Thin Foil by a laser pulse
Physics Letters A, 1998Co-Authors: S. S. Bulanov, Andrea Macchi, Francesco PegoraroAbstract:Abstract The process of ionization of matter acquires new features in the case of a laser pulse interacting with a Thin Foil. We employ an analytical description of the laser-Foil interaction which leads to nonlinear boundary conditions for the wave equation. We derive the characteristic ionization time of the Foil and show that the form and frequency of the laser pulse change during its interaction with the Foil.
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Nonlinear interaction of ultra-intense laser pulses with a Thin Foil
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 1998Co-Authors: V. A. Vshivkov, Francesco Pegoraro, N. Naumova, S. S. BulanovAbstract:Abstract The nonlinear interaction of an ultraintense laser pulse with a Thin Foil modifies the shape, the frequency content and the polarization of the pulse. An analytical description of this interaction is presented, together with the results of 1D3V and 2D3V particle in cell simulations. The conditions for the relativistic transparency of a Thin Foil are given and are shown to lead to the sharpening of the laser pulse. Such a pulse shape is advantageous for Laser Plasma Wakefield Acceleration of charged particles. In addition it is shown that a Thin Foil makes it possible to extract the accelerated particles nonadiabatically in the case of laser particle acceleration in vacuum.
Y Nodera - One of the best experts on this subject based on the ideXlab platform.
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Efficient laser energy conversion to ions in a laser-Foil interaction
2009 IEEE International Conference on Plasma Science - Abstracts, 2009Co-Authors: Shigeo Kawata, Y Nodera, J Limpouch, Ondrej Klimo, Kohki Takahashi, A. Andreev, Qing Kong, P. X. WangAbstract:Improvement of energy conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser- Foil interaction. When an intense short-pulse laser illuminates the Thin Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper a multihole Thin- Foil target is proposed in order to increase the energy conversion efficiency from laser to protons. The multiholes transpiercing the Foil target help to enhance the laser-proton energy conversion efficiency significantly. 2.5-dimensional particle-in-cell simulations present that the total laser- proton energy conversion efficiency becomes 9.3% for the multihole target, though the energy con version efficiency is 1.5% for a plain Thin Foil target. The maximum proton energy is lO.OMeV for the multihole target and is 3.14MeV for the plain target. The transpiercing multihole target serves a new method to increase the energy conversion efficiency from laser to ions. One of problems in the laser-ion acceleration is the energy conversion efficiency from laser to ions, and the energy conversion efficiency is low in actual experiments. The sub- wavelength fine microstructure enhances the laser energy absorption and the ion beam generation.
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Efficient laser ion acceleration in an intense-short-pulse-laser Foil interaction
2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009Co-Authors: Higeo Kawata, Y Nodera, J Limpouch, Ondrej Klimo, Kohki Takahashi, A. Andreev, Qing Kong, Zhengming Sheng, Pinxiao WangAbstract:In a laser-Foil interaction, a subwavelength-scale-multihole Thin-Foil target is proposed to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target enhance the laser-proton energy-conversion efficiency significantly.
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Efficient Production of Proton Beam in Laser-Illuminated Tailored Microstructured Target
IEEE Transactions on Plasma Science, 2009Co-Authors: Shigeo Kawata, Y Nodera, J Limpouch, Ondrej KlimoAbstract:In a proton beam generation by a laser-Foil interaction, significant improvement of energy-conversion efficiency from laser to proton beam is presented by particle simulations. When an intense short-pulse laser illuminates the Thin-Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper, a tailored multihole Thin-Foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the tailored multihole target, although the energy-conversion efficiency is 1.5% for a plain Thin-Foil target. The maximum proton energy is 10.0 MeV for the multihole target and is 3.14 MeV for the plain target. The transpiercing multihole target serves a new method to increase the energy-conversion efficiency from laser to ions.
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improvement of energy conversion efficiency from laser to proton beam in a laser Foil interaction
Physical Review E, 2008Co-Authors: Y Nodera, Shigeo Kawata, Nobuyoshi Onuma, J Limpouch, Ondrej Klimo, Takashi KikuchiAbstract:Improvement of energy-conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser-Foil interaction. When an intense short-pulse laser illuminates the Thin-Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper a multihole Thin-Foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target help to enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional ($x$, $y$, ${v}_{x}$, ${v}_{y}$, ${v}_{z}$) simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the multihole target, though the energy-conversion efficiency is 1.5% for a plain Thin-Foil target. The maximum proton energy is $10.0\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ for the multihole target and is $3.14\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ for the plain target. The transpiercing multihole target serves as a new method to increase the energy-conversion efficiency from laser to ions.
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Laser-produced collimated proton beam by a tailored Thin Foil target
2008 IEEE 35th International Conference on Plasma Science, 2008Co-Authors: Shigeo Kawata, Y Nodera, Nobuyoshi Onuma, J Limpouch, Takashi Kikuchi, Qing Kong, P. X. Wang, Masaki Nakamura, Ryo Sonobe, Ondrej KlimoAbstract:A Thin-Foil tailored hole target is proposed for an efficient production of a collimated proton beam in a laser target interaction. The tailored target has holes at the target surface. When an intense short pulse laser illuminates the Thin Foil hole target, transverse edge fields of an accelerated electron cloud and a proton source cloud are shielded by a protuberant part of the hole so that the proton beam divergence is suppressed. This paper presents a robustness of the hole target against laser parameter changes, against a contaminant proton source layer and against a laser alignment error. The 2.5-dimensional PIC (particle-in-cell) simulations also present that a multiple-hole target serves a high energy efficiency of the proton beam generation. Recent researches in this field have demonstrated acceleration of ions to a high energy in an interaction between an intense laser pulse and a Thin Foil target. The ion beams are expected to be useful for basic particle physics, medical therapy, controlled nuclear fusion, high-energy sources and so on. The important issues of the ion beam production include a quality of the ion beam and an efficient energy convergence to the ion beam from the laser. This paper presents a new method for the efficient collimated proton beam in the laser Foil interaction.
Renad Z. Sagdeev - One of the best experts on this subject based on the ideXlab platform.
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laser acceleration of monoenergetic protons in a self organized double layer from Thin Foil
Plasma Physics and Controlled Fusion, 2009Co-Authors: V K Tripathi, Xi Shao, Bengt Eliasson, Renad Z. SagdeevAbstract:We present a theory for the acceleration of monoenergetic protons, trapped in a self-organized double layer, by short pulse laser irradiation on a Thin Foil with the specific thickness suggested by the simulation study of Yan et al (2008 Phys. Rev. Lett. 100 135003). The laser ponderomotive force pushes the electrons forward, leaving the ions behind until the space charge electric field balances the ponderomotive force at a distance Δ. For the optimal target thickness D = Δ > c/ωp, the electron sheath is piled up at the rear surface and the sheath electric field accelerates the protons until they are reflected by the inertial force in the accelerated frame. These protons are therefore trapped by the combined forces of the electrostatic field of the electron sheath and the inertial force of the accelerating target. Together with the electron layer, they form a double layer and are collectively accelerated by the laser ponderomotive force, leading to monoenergetic ion production.
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Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-Thin Foil
New Journal of Physics, 2009Co-Authors: Bengt Eliasson, Chuan S. Liu, Renad Z. Sagdeev, Xi Shao, P K ShuklaAbstract:We present theoretical and numerical studies of the acceleration of monoenergetic protons in a double layer formed by the laser irradiation of an ultra-Thin film. The ponderomotive force of the laser light pushes the electrons forward, and the induced space charge electric field pulls the ions and makes the Thin Foil accelerate as a whole. The ions trapped by the combined electric field and inertial force in the accelerated frame, together with the electrons trapped in the well of the ponderomotive and ion electric field, form a stable double layer. The trapped ions are accelerated to monoenergetic energies up to 100 MeV and beyond, making them suitable for cancer treatment. We present an analytic theory for the laser-accelerated ion energy and for the amount of trapped ions as functions of the laser intensity, Foil thickness and the plasma number density. We also discuss the underlying physics of the trapped and untrapped ions in a double layer. The analytical results are compared with those obtained from direct Vlasov simulations of the fully nonlinear electron and ion dynamics that is controlled by the laser light.
J Badziak - One of the best experts on this subject based on the ideXlab platform.
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strong electromagnetic pulses generated in high intensity short pulse laser interactions with Thin Foil targets
Laser and Particle Beams, 2017Co-Authors: P Rączka, V T Tikhonchuk, M Rosinski, J L Dubois, S Hulin, A Zaraśszydlowska, J BadziakAbstract:Measurements are reported of the target neutralization current, the target charge, and the tangential component of the magnetic field generated as a result of laser–target interaction by pulses with the energy in the range of 45–92 mJ on target and the pulse duration from 39 to 1000 fs. The experiment was performed at the Eclipse facility in CELIA, Bordeaux. The aim of the experiment was to extend investigations performed for the thick (mm scale) targets to the case of Thin (μm thickness) targets in a way that would allow for a straightforward comparison of the results. We found that Thin Foil targets tend to generate 20–50% higher neutralization current and the target charge than the thick targets. The measurement of the tangential component of the magnetic field had shown that the initial spike is dominated by the 1 ns pulse consistent with the 1 ns pulse of the neutralization current, but there are some differences between targets of different types on sub-ns scale, which is an effect going beyond a simple picture of the target acting as an antenna. The sub-ns structure appears to be reproducible to surprising degree. We found that there is in general a linear correlation between the maximum value of the magnetic field and the maximum neutralization current, which supports the target-antenna picture, except for pulses 100s of fs long.
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high energy conversion efficiency in laser proton acceleration by controlling laser energy deposition onto Thin Foil targets
Applied Physics Letters, 2014Co-Authors: C M Brenner, A P L Robinson, K Markey, R H H Scott, R J Gray, M Rosinski, K Deppert, J Badziak, D Batani, J R DaviesAbstract:An all-optical approach to laser-proton acceleration enhancement is investigated using the simplest of target designs to demonstrate application-relevant levels of energy conversion efficiency between laser and protons. Controlled deposition of laser energy, in the form of a double-pulse temporal envelope, is investigated in combination with Thin Foil targets in which recirculation of laser-accelerated electrons can lead to optimal conditions for coupling laser drive energy into the proton beam. This approach is shown to deliver a substantial enhancement in the coupling of laser energy to 5–30 MeV protons, compared to single pulse irradiation, reaching a record high 15% conversion efficiency with a temporal separation of 1 ps between the two pulses and a 5 μm-thick Au Foil. A 1D simulation code is used to support and explain the origin of the observation of an optimum pulse separation of ∼1 ps.
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fast proton generation from ultrashort laser pulse interaction with double layer Foil targets
Physical Review Letters, 2001Co-Authors: J Badziak, S Jablonski, P Parys, Yu K Platonov, E WorynaAbstract:tion, i.e., maximizing proton energies and/or current at a given energy (intensity) of a laser pulse. In this paper we show for the first time that using double-layer Thin Foil targets containing high-Z front layer and low-Z hydrogenrich back layer, instead of commonly used single-layer targets, a considerable increase in energies and current of forward emitted protons is possible. The results of the measurements are interpreted in terms of the electrostatic acceleration mechanism assuming that most of the forward accelerated protons originate from the back target surface. The experiment used a terawatt chirped-pulseamplification Nd:glass laser [20], generating a 1-ps pulse of short-time scale ,1 ns intensity contrast ratio 10 4 at l 1.05 mm. The linearly polarized laser beam was focused onto Thin Foil targets, perpendicular to the target surface, with the use of an aspheric lens of the focal length f 7.5 cm. At the best focusing 30% 40% of the laser energy was concentrated in a 10-mm focal spot. Short-lasting 10 210 s background of the main pulse produced a preplasma of a density scale length comparable to l [21].
Ondrej Klimo - One of the best experts on this subject based on the ideXlab platform.
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Efficient laser energy conversion to ions in a laser-Foil interaction
2009 IEEE International Conference on Plasma Science - Abstracts, 2009Co-Authors: Shigeo Kawata, Y Nodera, J Limpouch, Ondrej Klimo, Kohki Takahashi, A. Andreev, Qing Kong, P. X. WangAbstract:Improvement of energy conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser- Foil interaction. When an intense short-pulse laser illuminates the Thin Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper a multihole Thin- Foil target is proposed in order to increase the energy conversion efficiency from laser to protons. The multiholes transpiercing the Foil target help to enhance the laser-proton energy conversion efficiency significantly. 2.5-dimensional particle-in-cell simulations present that the total laser- proton energy conversion efficiency becomes 9.3% for the multihole target, though the energy con version efficiency is 1.5% for a plain Thin Foil target. The maximum proton energy is lO.OMeV for the multihole target and is 3.14MeV for the plain target. The transpiercing multihole target serves a new method to increase the energy conversion efficiency from laser to ions. One of problems in the laser-ion acceleration is the energy conversion efficiency from laser to ions, and the energy conversion efficiency is low in actual experiments. The sub- wavelength fine microstructure enhances the laser energy absorption and the ion beam generation.
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Efficient laser ion acceleration in an intense-short-pulse-laser Foil interaction
2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009Co-Authors: Higeo Kawata, Y Nodera, J Limpouch, Ondrej Klimo, Kohki Takahashi, A. Andreev, Qing Kong, Zhengming Sheng, Pinxiao WangAbstract:In a laser-Foil interaction, a subwavelength-scale-multihole Thin-Foil target is proposed to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target enhance the laser-proton energy-conversion efficiency significantly.
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Efficient Production of Proton Beam in Laser-Illuminated Tailored Microstructured Target
IEEE Transactions on Plasma Science, 2009Co-Authors: Shigeo Kawata, Y Nodera, J Limpouch, Ondrej KlimoAbstract:In a proton beam generation by a laser-Foil interaction, significant improvement of energy-conversion efficiency from laser to proton beam is presented by particle simulations. When an intense short-pulse laser illuminates the Thin-Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper, a tailored multihole Thin-Foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the tailored multihole target, although the energy-conversion efficiency is 1.5% for a plain Thin-Foil target. The maximum proton energy is 10.0 MeV for the multihole target and is 3.14 MeV for the plain target. The transpiercing multihole target serves a new method to increase the energy-conversion efficiency from laser to ions.
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improvement of energy conversion efficiency from laser to proton beam in a laser Foil interaction
Physical Review E, 2008Co-Authors: Y Nodera, Shigeo Kawata, Nobuyoshi Onuma, J Limpouch, Ondrej Klimo, Takashi KikuchiAbstract:Improvement of energy-conversion efficiency from laser to proton beam is demonstrated by particle simulations in a laser-Foil interaction. When an intense short-pulse laser illuminates the Thin-Foil target, the Foil electrons are accelerated around the target by the ponderomotive force. The hot electrons generate a strong electric field, which accelerates the Foil protons, and the proton beam is generated. In this paper a multihole Thin-Foil target is proposed in order to increase the energy-conversion efficiency from laser to protons. The multiholes transpiercing the Foil target help to enhance the laser-proton energy-conversion efficiency significantly. Particle-in-cell 2.5-dimensional ($x$, $y$, ${v}_{x}$, ${v}_{y}$, ${v}_{z}$) simulations present that the total laser-proton energy-conversion efficiency becomes 9.3% for the multihole target, though the energy-conversion efficiency is 1.5% for a plain Thin-Foil target. The maximum proton energy is $10.0\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ for the multihole target and is $3.14\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$ for the plain target. The transpiercing multihole target serves as a new method to increase the energy-conversion efficiency from laser to ions.
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Laser-produced collimated proton beam by a tailored Thin Foil target
2008 IEEE 35th International Conference on Plasma Science, 2008Co-Authors: Shigeo Kawata, Y Nodera, Nobuyoshi Onuma, J Limpouch, Takashi Kikuchi, Qing Kong, P. X. Wang, Masaki Nakamura, Ryo Sonobe, Ondrej KlimoAbstract:A Thin-Foil tailored hole target is proposed for an efficient production of a collimated proton beam in a laser target interaction. The tailored target has holes at the target surface. When an intense short pulse laser illuminates the Thin Foil hole target, transverse edge fields of an accelerated electron cloud and a proton source cloud are shielded by a protuberant part of the hole so that the proton beam divergence is suppressed. This paper presents a robustness of the hole target against laser parameter changes, against a contaminant proton source layer and against a laser alignment error. The 2.5-dimensional PIC (particle-in-cell) simulations also present that a multiple-hole target serves a high energy efficiency of the proton beam generation. Recent researches in this field have demonstrated acceleration of ions to a high energy in an interaction between an intense laser pulse and a Thin Foil target. The ion beams are expected to be useful for basic particle physics, medical therapy, controlled nuclear fusion, high-energy sources and so on. The important issues of the ion beam production include a quality of the ion beam and an efficient energy convergence to the ion beam from the laser. This paper presents a new method for the efficient collimated proton beam in the laser Foil interaction.
