Profile measurement and analysis of ablative-capillary-discharge plasma channel

Kameshima, Takashi; Kotaki, Hideyuki; Kando, Masaki; Daito, Izuru; Kawase, Keigo; Fukuda, Yuji; Chen, L.*; Homma, Takayuki; Kondo, Shuji; Esirkepov, T. Z.; Bobrova, N. A.*; Sasorov, P. V.*; Bulanov, S. V.

The technology of laser optical guiding is important for the laser plasma electron acceleration in order to improve electron beams's energy gain, because the duration of laser focusing represents the length of the laser wakefield. In present, capillary discharge is promising to generate a plasma channel for a laser pulse. Plasma channel in the capillary has a refraction structure in the radial direction to guide a laser pulse, In addition, it is possible to generate a cm-scale plasma, and therefore, the length of the laser wakefield is significantly extended. In this presentation, we reports the investigation of the ablative capillary. The profile measurement and analysis result are presented.