Controlled electron injection into laser wakefields with a perpendicular injection laser pulse

Wang, W.-M.; Sheng, Z.-M.; Zhang, J.
November 2008
Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p201502
Academic Journal
Electron injection into laser wakefields for acceleration by two orthogonally directed laser pulses is investigated theoretically. It is found that efficient injection occurs provided the two pulses are collinearly polarized, even if the injection pulse is much weaker than the pump pulse driving wakefields. Compared with the head-on colliding injection geometry, this scheme allows for a shorter propagation distance less than a Rayleigh length for the injection pulse, before its overlapping with the pump pulse. Moreover, it can generate electron beams stably with comparable low energy spread and emittance, as demonstrated by particle-in-cell simulations. The optimization of laser parameters is also investigated.


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