20 MeV quasi-monoenergetic electron beam production by using JLITE-X laser system at JAEA-APRC

Mori, Michiaki; Kando, Masaki; Daito, Izuru; Kotaki, Hideyuki; Hayashi, Yukio; Ogura, Koichi; Sagisaka, Akito; Esirkepov, T. Z.; Nakajima, Kazuhisa; Daido, Hiroyuki; Bulanov, S. V.; Kimura, Toyoaki

The quasi-monoenergetic electron beam produced by intense laser-plasma interaction was observed at plasma densities from to . The terawatt laser beam was focused by using an off-axis parabolic mirror with f=648 mm. We observed quasi-monoenergetic electron beams in the forward direction. The peak energy of quasi-monoenergetic component of the electron beam was increased from 9 MeV to 20 MeV with a energy spread of 20 increasing the plasma density from to . However, the quasi-monoenergetic component of the electron beam disappeared at a plasma density of , and non-equilibrium (non Maxwellian) spectrum of the electron beam was observed. The table-top laser driven fs quasi-monoenergetic electron beam which is applicable to variety of fields has been demonstrated.