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TUPSA01 |
Trapping of Electron Bunches Injected in a Wake Wave | |
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The process of electron trapping by a wake wave excited by a laser pulse in a plasma channel in the case where the electron bunches are injected into the vicinity of the maximum of the wakefield potential at a velocity lower than the wave phase velocity is investigated analytically and numerically*. The mechanism for the formation of a compact electron bunch in the trapping region when only the electrons of the injected bunch that are trapped in the focusing phase mainly undergo the subsequent acceleration in the wake field is analyzed. The influence of the spatial dimensions of the injected bunch and its energy spread on the length of the trapped electron bunch and the fraction of trapped electrons is studied. Formulas have been derived that allows one to accurately estimate the length of the trapped electron bunch and the number of electrons in it. It is shown that the influence of the transverse dimensions of the injected bunch on the length of the trapped electron bunch in the accelerating stage is as important as the influence of its longitudinal size.
*S.V. Kuznetsov Plasma Physics Reports, 2014, Vol. 40, No. 8, pp. 611–622. |
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