期刊
LASER AND PARTICLE BEAMS
卷 26, 期 3, 页码 397-409出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0263034608000414
关键词
laser-plasma interaction; microbunching of electron beams; super-intense laser pulse; ultrashort electron beams
资金
- Ministry of Knowledge and Economy of Korea [05-02-17297-a]
The evolution of a high-density electron beam in the field of a super-intense laser Pulse is Considered. The one-dimensional (1D) theory for the description of interaction, taking into account the space-charge forces of the beam, is developed, and exact solutions for the equations of motion of the electrons are found. It was shown that the length of the high-density electron beam increases slowly in time after initial compression of the beam by the laser pulse as opposed to the low-density electron beam case. where the length is constant on average. Also, for the high-density electron beam, the sharp peak frozen into the density distribution can appear in addition to a microbunching, which is characteristic for a low-density electron beam in a super-intense laser field. Characteristic parameters for the evolution of the electron beam are calculated by an example of a step-like envelope of the laser pulse. Comparison with 1D particle-in-cell simulations shows adequacy of the derived theory. The considered issue is very important for a special two-pulse realization of a Thomson scattering scheme. where one high-intensity laser pulse is used for acceleration, compression and microbunching of the electron beam. and the other probe counter-streaming laser pulse is used for scattering with frequency up-shifting and amplitude enhancement.
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