Control of the laser accelerated electron beam

レーザー加速電子ビームのコントロール

小瀧 秀行; 林 由紀雄; 川瀬 啓悟; 森 道昭; 神門 正城; 本間 隆之; Bulanov, S. V.

Kotaki, Hideyuki; Hayashi, Yukio; Kawase, Keigo; Mori, Michiaki; Kando, Masaki; Homma, Takayuki; Bulanov, S. V.

Laser Wake Field Acceleration (LWFA) is regarded for the next-generation of charged particle accelerators. In experiments, it has been demonstrated that LWFA is capable of generating electron bunches with high quality. In order to use a laser accelerated electron beam to applications, it is necessary to generate a stable electron beam and to control the electron beam. We succeed to generate a stable electron beam by using Nitrogen gas as a target. The profile of the electron beam can be controlled by changing the laser polarization. When we use a S polarized laser pulse, a 20 MeV electron beam is observed with a oscillation in the image of the energy spectrum. From the oscillation, the pulse width of the electron beam is calculated to 4 fs. The direction of the electron beam can be controlled by changing the gas jet position. The self-injected electron beam can be controlled by the control of the laser and the gas jet.