Article

# Observation of magnetized soliton remnants in the wake of intense laser pulse propagation through plasmas.

Centre for Plasma Physics, The Queen's University of Belfast, United Kingdom.

Physical Review Letters (Impact Factor: 7.73). 10/2010; 105(17):175002. DOI: 10.1103/PHYSREVLETT.105.175002 Source: PubMed

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**ABSTRACT:**Ion acceleration driven by superintense laser pulses is attracting an impressive and steadily increasing effort. Motivations can be found in the potential for a number of foreseen applications and in the perspective to investigate novel regimes as far as available laser intensities will be increasing. Experiments have demonstrated in a wide range of laser and target parameters the generation of multi-MeV proton and ion beams with unique properties such as ultrashort duration, high brilliance and low emittance. In this paper we give an overview of the state-of-the art of ion acceleration by laser pulses as well as an outlook on its future development and perspectives. We describe the main features observed in the experiments, the observed scaling with laser and plasma parameters and the main models used both to interpret experimental data and to suggest new research directions.Review of Modern Physics 02/2013; 85(2). · 44.98 Impact Factor -
##### Article: Wakefield effects and solitary waves of an intense short laser pulse propagation in a plasma channel

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**ABSTRACT:**In the presence of relativistic and channel-coupling nonlinearity and wakefield effects, the propagation characteristics and solitary waves of an intense short laser pulse in a preformed plasma channel are investigated. The evolution equation of the laser spot size is derived by using variational technique, the initial laser and plasma parameters for propagation with constant spot size, periodic defocusing and focusing oscillations, and solitary waves are identified. For illustration, some numerical results are also presented. It is found that the laser focusing is enhanced by the wakefield effects that result in a significant reduced focusing power.Physics of Plasmas 10/2011; 18(10):103106-103106-8. · 2.38 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**We investigate the existence of nonlinear phase-modulated relativistic solitary waves embedded in an infinitely long circularly polarized electromagnetic wave propagating through a plasma. These states are exact nonlinear solutions of the 1-dimensional Maxwell-fluid model for a cold plasma composed of electrons and ions. The solitary wave, which consists of an electromagnetic wave trapped in a self-generated Langmuir wave, presents a phase modulation when the group velocity V and the phase velocity Vph of the long circularly polarized electromagnetic wave do not match the condition VVph = c2. The main properties of the waves as a function of their group velocities, wavevectors, and frequencies are studied, as well as bifurcations of the dynamical system that describes the waves when the parameter controlling the phase modulation changes from zero to a finite value. Such a transition is illustrated in the limit of small amplitude waves where an analytical solution for a grey solitary wave exists. The solutions are interpreted as the stationary state after the collision of a long laser pulse with an isolated solitary wave.Physics of Plasmas 01/2011; 18. · 2.38 Impact Factor

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