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TUPSA03 |
Acceleration of Electron Bunches Generated by a Laser Pulse Crossing a Boundary of Inhomogeneous Plasma | |
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Funding: The work was supported by the Russian Science Foundation (Grant No. 14-50-00124). The process of the generation and acceleration of an electron bunches by a laser pulse of ultrarelativistic intensity that interacts with underdense plasma target with an upramp density profile followed by a plateau has been studied. Numerical simulation has clearly demonstrated that the generation of electron bunches by a laser pulse is a consequence of 1D wave breaking to occur sharply at the up-ramp-plateau transition. The process of electron self-injection into the accelerating wake wave starts with an electron that initially occurred at a distance from the edge of the plateau equal to the amplitude of its longitudinal oscillations. This electron becomes a leader, that is, the first particle in the head part of the bunch trapped in the wake wave. The major fraction of electrons trapped in the wake wave are electrons that initially occurred in front of the electron leader. The fraction of electrons trapped in the wake, which are initially occurred behind the electron leader, determines by a slope of upramp density profile. The length, mean energy and energy spread of the trapped and accelerated electron bunch are determined by gamma-factor of a laser pulse and the total energy of longitudinal oscillation of plasma electrons, excited by a laser pulse*. *S.V. Kuznetsov Quantum Electronics, 2017, Vol. 47, No. 2, pp. 87-96. |
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