Generation of a wakefield during gas ionization |
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Authors: | N E Andreev M E Veisman M G Cadjan M V Chegotov |
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Institution: | (1) Institute for High Energy Densities, Associated Institute for High Temperatures, Russian Academy of Sciences, Izthorskaya ul. 13/19, Moscow, 127412, Russia |
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Abstract: | One-dimensional equations are derived that describe the hydrodynamic and electrodynamic properties of a plasma created through gas ionization by a short intense laser pulse. Different approaches (in particular, the particle-in-cell method) are used to show that, with ionization processes included, the excitation of a wakefield by an intense laser pulse can be described by the method of slowly varying amplitudes. It is shown that ionization processes enhance the wakefield excited by a moderate-intensity laser by about 10% in the case of a linearly polarized laser and by about 50% in the case of a circularly polarized laser. Ionization processes in light gases irradiated with high-intensity laser pulses have essentially no effect on the wakefield during the resonant excitation of a plasma wave by the ponderomotive force and play a governing role far from the resonance. |
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