The longitudinal motion of electrons and waves in plasmas with an ultraintense laser field

Based on a relativistic Maxwell-fluid description, the existence of ultrarelativistic laser-induced periodic waves in an electron-ion plasma is investigated. Within a one-dimensional propagation geometry nonlinear coupling of the electromagnetic and electrostatic components occurs that makes the fourth-order problem nonintegrable. A Hamiltonian description is derived, and the manifolds of periodic solutions are studied by Poincaré section plots. The influence of ion motion is investigated in different intensity regimes. For ultrarelativistic laser intensities the phase-space structures change significantly compared to the weakly relativistic case. Ion motion becomes very important such that finally electron-ion plasmas in the far-ultrarelativistic regime behave similarly to electron-positron plasmas. The characteristic new types of periodic solutions of the system are identified and discussed.

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Energy gain of an electron by a laser pulse in the presence of radiation reaction

Lehmann

Spatschek

2011

Phys. Rev. E

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A well-known no-energy-gain theorem states that an electron cannot gain energy when being overrun by a plane (transverse) laser pulse of finite length. The theorem is based on symmetries which are broken when radiation reaction (RR) is included. It is shown here that an electron, e.g., being initially at rest, will gain a positive velocity component in the laser propagation direction after being overrun by an intense laser pulse (of finite duration and with intensity of order 5×10(22) W/cm(2) or larger). The velocity increment is due to RR effects. The latter are incorporated in the Landau-Lifshitz form. Both linear as well as circular polarization of the laser pulse are considered. It is demonstrated that the velocity gain is proportional to the pulse length and the square of the peak amplitude of the laser pulse. The results of numerical simulations are supported by analytical estimates.

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The longitudinal motion of electrons and waves in plasmas with an ultraintense laser field

Cited by 3 publications

References 23 publications

Classification and stability of plasma motion in periodic linearly polarized relativistic waves

Classification and stability of plasma motion in periodic linearly polarized relativistic waves

Poincaré analysis of wave motion in ultrarelativistic electron-ion plasmas

Energy gain of an electron by a laser pulse in the presence of radiation reaction

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