Dr. Neda Naseri Profile

Dr. Neda Naseri

at Tech-X Corp

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Proceedings Article | 7 May 2013 Paper

Relativistic electron generation in laser produced ion channels

Neda Naseri, Denis Pesme, Wojciech Rozmus

Proceedings Volume 8779, 877913 (2013) https://doi.org/10.1117/12.2021608

KEYWORDS: Photonic integrated circuits, Plasma, Particles, Pulsed laser operation, Wave propagation, Optical simulations, Electroluminescence, Ion channels, Electromagnetism, Magnetism

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This contribution is concerned with the channeling of a relativistic laser pulse propagating in an underdense plasma, and with the subsequent generation of fast electrons in the cavitated ion channels. Specifically, we study the interaction of laser pulses of duration of several 10² femtoseconds, having their intensity Iλ² in the range [10¹⁹; 10²⁰]Wcm⁻²μm² and focused in underdense plasmas, with electron densities n₀ such that the ratio n₀=n_c lies in the interval [10⁻³, 10⁻¹], n_c denoting the critical density. The laser power P_L exceeds the critical power for laser channeling P_ch = 1:09P_c, P_c denoting the critical power for relativistic self-focusing. The laser-plasma interaction under such conditions is investigated by means of three dimensional (3D) Particle-In-Cell (PIC) simulations. It is observed that the steep laser front gives rise to the excitation of a surface wave which propagates along the sharp radial boundaries of the electron free channel created by the laser pulse. The mechanism responsible for the generation of relativistic electrons observed in the PIC simulations is then analyzed by means of a 3D test particles code. The fast electrons are thus found to be generated by the combination of the electron acceleration caused by the surface wave and of the betatron mechanism. The maximum electron energy observed in the simulations is scaled as a function of P_L/P_c; it reaches 350 - 400 MeV for P_L/P_c = 70 - 140.

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