Enhanced Collimated GeV Monoenergetic Ion Acceleration from a Shaped Foil Target Irradiated by a Circularly Polarized Laser Pulse

Institut für Theoretische Physik I, Heinrich-Heine-Universität Düsseldorf, Düsseldorf 40225, Germany.
Physical Review Letters (Impact Factor: 7.51). 08/2009; 103(2):024801. DOI: 10.1103/PhysRevLett.103.024801
Source: PubMed


Using multidimensional particle-in-cell simulations we study ion acceleration from a foil irradiated by a circularly polarized laser pulse at 10;{22} W/cm;{2} intensity. When the foil is shaped initially in the transverse direction to match the laser intensity profile, three different regions (acceleration, transparency, and deformation region) are observed. In the acceleration region, the foil can be uniformly accelerated for a longer time compared to a usual flat target. Undesirable plasma heating is effectively suppressed. The final energy spectrum of the accelerated ion beam in the acceleration region is improved dramatically. Collimated GeV quasi-monoenergetic ion beams carrying as much as 19% of the laser energy are observed in multidimensional simulations.

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Available from: Tong-Pu Yu, Jun 13, 2014
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    • "In the following we characterize the HB and LS regimes summarizing for both the most relevant results and the relevant scaling laws, and commenting on the related experimental challenges and expected suitability for foreseen applications . While in the present paper we consider only basic features for briefity, we note that other recent papers addressed other related issues such as RPA in structured or composite targets [23] [24] [25] [26] or the effect of elliptical (rather than perfecly circular) polarization [27] [28]. "
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    ABSTRACT: Radiation Pressure Acceleration (RPA) by circularly polarized laser pulses is emerging as a promising way to obtain efficient acceleration of ions. We briefly review theoretical work on the topic, aiming at characterizing suitable experimental scenarios. We discuss the two reference cases of RPA, namely the thick target ("Hole Boring") and the (ultra)thin target ("Light Sail") regimes. The different scaling laws of the two regimes, the related experimental challenges and their suitability for foreseen applications are discussed.
    Nuclear Instruments and Methods in Physics Research 08/2010; 620(1):41-45. DOI:10.1016/j.nima.2010.01.057
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    • "Both of the maximal density and cutoff density in the cases 1 and 3 are the same. Case 4 is the SFT presented by Chen et al. (Chen et al., 2009), where the foil thickness is matched to the laser intensity profile. For the convenience of comparison, here the SFT is made with a matched profile (corresponding to a cutoff thickness of 0.06λ) so that the whole target contains the same number of protons as that in our case. "
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    ABSTRACT: We study proton acceleration from a foil target with a transversely varying density using multi-dimensional Particle-in-Cell (PIC) simulations. In order to reduce electron heating and deformation of the target, circularly polarized Gaussian laser pulses at intensities of the order of 1022Wcm-2 are used. It is shown that when the target density distribution fits that of the laser intensity profile, protons accelerated from the center part of the target have quasi-monoenergetic spectra and are well collimated. In our two-dimensional PIC simulations, the final peak energy can be up to 1.4 GeV with the full-width of half maximum divergence cone of less than 4o. We observe highly efficient energy conversion from the laser to the protons in the simulations.
    Laser and Particle Beams 06/2009; 27(04). DOI:10.1017/S0263034609990334 · 1.30 Impact Factor
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