Stability improvement of laser accelerated electron beams

Kotaki, Hideyuki; Mori, Michiaki; Hayashi, Yukio; Kando, Masaki; Daito, Izuru; Fukuda, Yuji; Pirozhkov, A. S.; Koga, J. K.; Bulanov, S. V.

Laser-driven plasma accelerators have been conceived to be the next-generation particle accelerators, promising ultrahigh field particle acceleration with a very short duration electron beam. In order to generate a stable high-quality electron beam, optical injection by collision of two laser pulses is proposed. The collision of two laser pulses generates a high-quality electron beam with high repeatability. In applications of the laser accelerated electron beam, it is necessary to generate an electron beam with high repetition rate. We succeed to generate an electron beam with 10 Hz by using a Nitrogen and Argon gas target. When we use the multi-ionization gas target, the plasma channel become longer than the channel for Helium gas target. We found that it is possible to generate a stable electron beam by using multi-ionization gas target due to the long channel.