Enhancement of injection and acceleration of electrons in a laser wakefield accelerator by using an argon-doped hydrogen gas jet and optically preformed plasma waveguide

Ho, Y.-C.; Hung, T.-S.; Yen, C.-P.; Chen, S.-Y.; Chu, H.-H.; Lin, J.-Y.; Wang, J.; Chou, M.-C.
June 2011
Physics of Plasmas;Jun2011, Vol. 18 Issue 6, p063102
Academic Journal
A systematic experimental study on injection of electrons in a gas-jet-based laser wakefield accelerator via ionization of dopant was conducted. The pump-pulse threshold energy for producing a quasi-monoenergetic electron beam was significantly reduced by doping the hydrogen gas jet with argon atoms, resulting in a much better spatial contrast of the electron beam. Furthermore, laser wakefield electron acceleration in an optically preformed plasma waveguide based on the axicon-ignitor-heater scheme was achieved. It was found that doping with argon atoms can also lower the pump-pulse threshold energy in this experimental configuration.


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