77 research outputs found
Dynamics of relativistic solitons
Relativistic solitons are self-trapped, finite size, electromagnetic waves of
relativistic intensity that propagate without diffraction spreading. They have
been predicted theoretically within the relativistic fluid approximation, and
have been observed in multi-dimensional particle in cell simulations of laser
pulse interaction with the plasma. Solitons were observed in the laser
irradiated plasmas with the proton imaging technique as well. This paper
reviews many theoretical results on relativistic solitons in electron-ion
plasmas.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004,
Nice (France
Three Dimensional Relativistic Electromagnetic Sub-cycle Solitons
Three dimensional (3D) relativistic electromagnetic sub-cycle solitons were
observed in 3D Particle-in-Cell simulations of an intense short laser pulse
propagation in an underdense plasma. Their structure resembles that of an
oscillating electric dipole with a poloidal electric field and a toroidal
magnetic field that oscillate in-phase with the electron density with frequency
below the Langmuir frequency. On the ion time scale the soliton undergoes a
Coulomb explosion of its core, resulting in ion acceleration, and then evolves
into a slowly expanding quasi-neutral cavity.Comment: 5 pages, 6 figures;
http://www.ile.osaka-u.ac.jp/research/TSI/Timur/soliton/index.htm
Towards Bright Gamma-Ray Flash Generation From Tailored Target Irradiated by Multi-Petawatt Laser
One of the remarkable phenomena in the laser-matter interaction is the
extremely efficient energy transfer to -photons, that appears as a
collimated -ray beam. For interactions of realistic laser pulses with
matter, existence of a background field plays a crucial role, since it hits the
target prior to the main pulse arrival, leading to a cloud of preplasma and
drilling a narrow channel inside the target. These effects significantly alter
the process of -photon generation. Here, we study this process by
importing the outcome of magnetohydrodynamic simulations of the target
interaction into particle-in-cell simulations for describing the
-photon generation. It is seen that the background field effect plays
an important positive role, enhancing the efficiency of laser pulse coupling
with the target, and generating high energy electron-positron pairs. It is
expected that such a -photon source will be actively used in various
applications in nuclear photonics, material science and astrophysical processes
modeling.Comment: 8 pages, 7 figure
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