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      Relativistic interaction of long-wavelength ultrashort laser pulses with nanowires

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          Abstract

          We report on experimental results in a new regime of a relativistic light-matter interaction employing mid-infrared (3.9-micrometer wavelength) high-intensity femtosecond laser pulses. In the laser generated plasma, the electrons reach relativistic energies already at rather low intensities due to the fortunate lambda^2-scaling of the kinetic energy with the laser wavelength. The lower intensity suppresses optical field ionization and creation of the pre-plasma at the rising edge of the laser pulse efficiently, enabling an enhanced efficient vacuum heating of the plasma. The lower critical plasma density for long-wavelength radiation can be surmounted by using nanowires instead of flat targets. In our experiments about 80% of the incident laser energy has been absorbed resulting in a long living, keV-temperature, high-charge state plasma with a density of more than three orders of magnitude above the critical value. Our results pave the way to laser-driven experiments on laboratory astrophysics and nuclear physics at a high repetition rate.

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          Relativistic Laser-Matter Interaction and Relativistic Laboratory Astrophysics

          The paper is devoted to the prospects of using the laser radiation interaction with plasmas in the laboratory relativistic astrophysics context. We discuss the dimensionless parameters characterizing the processes in the laser and astrophysical plasmas and emphasize a similarity between the laser and astrophysical plasmas in the ultrarelativistic energy limit. In particular, we address basic mechanisms of the charged particle acceleration, the collisionless shock wave and magnetic reconnection and vortex dynamics properties relevant to the problem of ultrarelativistic particle acceleration.
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            Micro-scale fusion in dense relativistic nanowire array plasmas

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              High density plasmas for recombination X-ray lasers

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                Author and article information

                Journal
                24 September 2018
                Article
                1809.08882
                4f3298cf-46c6-4ce9-95b6-e513d60d883f

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                physics.plasm-ph

                Plasma physics
                Plasma physics

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