V. Seredov

Heinrich-Heine-Universität Düsseldorf, Düsseldorf, North Rhine-Westphalia, Germany

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Publications (5)14.17 Total impact

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    ABSTRACT: We present a theory for electron self-injection in nonlinear, multidimensional plasma waves excited by a short laser pulse in the bubble regime or by a short electron beam in the blowout regime. In these regimes, which are typical for electron acceleration in the last impressive experiments, the laser radiation pressure or the electron beam charge pushes out plasma electrons from some region, forming a plasma cavity or a bubble with a huge ion charge. The plasma electrons can be trapped in the bubble and accelerated by the plasma wakefields up to a very high energy. We derive the condition of the electron trapping in the bubble. The developed theory predicts the trapping cross section in terms of the bubble radius and the bubble velocity. It is found that the dynamic bubble deformations observed in the three-dimensional (3D) particle-in-cell (PIC) simulations influence the trapping process significantly. The bubble elongation reduces the gamma-factor of the bubble, thereby strongly enhancing self-injection. The obtained analytical results are in good agreement with the 3D PIC simulations.
    New Journal of Physics 04/2010; 12(4):045009. · 4.06 Impact Factor
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    ABSTRACT: We present a simple model (piecewise model) for electron self-injection in nonlinear, multidimensional plasma waves excited by short laser pulse in the bubble regime. In this model fields are assumed to be constant in quarters that yields an extra integral of the electron motion and allows us to obtain analytical expressions for the electron trajectories. In the framework of this model we derive the condition of the electron trapping in the bubble. The developed theory predicts the trapping cross section in terms of the bubble radius and the bubble velocity and reveals key features of electron trapping in three-dimensional regime.
    04/2010;
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    ABSTRACT: We present an analytical model for electron self-injection in a nonlinear, multidimensional plasma wave excited by a short laser pulse in the bubble regime or by a short electron beam in the blowout regime. In these regimes, which are typical for electron acceleration, the laser radiation pressure or the electron beam charge pushes out background plasma electrons forming a plasma cavity--bubble--with a huge ion charge. The plasma electrons can be trapped in the bubble and accelerated by the plasma wakefields up to very high energies. The model predicts the condition for electron trapping and the trapping cross section in terms of the bubble radius and the bubble velocity. The obtained results are in a good agreement with results of 3D particle-in-cell simulations.
    Physical Review Letters 10/2009; 103(17):175003. · 7.73 Impact Factor
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    ABSTRACT: Using Particle-in-Cell simulations as well as analytical theory we study electron acceleration in underdense plasmas both in the Bubble regime and in the weakly relativistic periodic wake fields. In the Bubble regime, electron trapping is taken as a function of the propagated distance. The number of trapped electrons depends on the effective phase velocity of the X-point at the rear of the Bubble. For the weakly relativistic periodic wakes, we show that the phase synchronism between the wake and the relativistic electrons can be maintained over very long distances when the plasma density is tapered properly. Moreover, one can use layered plasmas to control and improve the accelerated beam quality. To cite this article: A. Pukhov et al., C. R. Physique 10 (2009).
    Comptes Rendus Physique - C R PHYS. 01/2009; 10(2):159-166.
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    ABSTRACT: This Letter aims to demonstrate the ultrafast nature of laser produced betatron radiation and its potential for application experiments. An upper estimate of the betatron x-ray pulse duration has been obtained by performing a time-resolved x-ray diffraction experiment: The ultrafast nonthermal melting of a semiconductor crystal (InSb) has been used to trigger the betatron x-ray beam diffracted from the surface. An x-ray pulse duration of less than 1 ps at full width half-maximum (FWHM) has been measured with a best fit obtained for 100 fs FWHM.
    Physics of Plasmas 07/2007; 14(8):080701-080701-4. · 2.38 Impact Factor

Publication Stats

60 Citations
14.17 Total Impact Points

Institutions

  • 2007–2010
    • Heinrich-Heine-Universität Düsseldorf
      • Institute for Theoretical Physics I.
      Düsseldorf, North Rhine-Westphalia, Germany
  • 2009
    • Russian Academy of Sciences
      • Institute of Applied Physics, Russian Academy of Sciences
      Moscow, Moscow, Russia