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Splash plasma channels produced by picosecond laser pulses in argon gas for laser wakefield acceleration

Mizuta, Yoshio*; Hosokai, Tomonao*; Masuda, Shinichi*; Zhidkov, A.*; Makito, Keigo*; Nakanii, Nobuhiko*; Kajino, Shohei*; Nishida, Akinori*; Kando, Masaki; Mori, Michiaki; Kotaki, Hideyuki; Hayashi, Yukio; Bulanov, S. V.; Kodama, Ryosuke*

Laser wakefield acceleration is capable of generating electron bunches with high quality: quasi-monoenergetic, low in emittance, and a very short duration of the order of ten femto-seconds. Such femtosecond bunches can be used to measure ultrafast phenomena. We conducted experiments for controllable electron bunch generation. Short-lived, $$sim$$10 ps, deep plasma channels, with their lengths of $$sim$$1 mm and diameters of $$sim$$20 $$mu$$m, are observed and characterized in Ar gas jets irradiated by moderate intensity, $$sim$$10$$^{15-16}$$ W/cm$$^2$$, laser pulses with a duration from subpicosecond to several picoseconds. The channels, upon 2D particle-in-cell simulations including ionization, fit well in the guiding of high intensity femtosecond laser pulses and, therefore, in laser wakefield acceleration with a controllable electron self-injection.

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Category:Physics, Nuclear

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