Proton generation driven by a high intensity laser using a thin-foil target

Sagisaka, Akito; Bolton, P. R.; Bulanov, S. V.; Daido, Hiroyuki; Esirkepov, T. Zh.; Hori, Toshihiko; Kanazawa, Shuhei; Kiriyama, Hiromitsu; Kondo, Kiminori; Kondo, Shuji; Mori, Michiaki; Nakai, Yoshiki*; Nishiuchi, Mamiko; Ogura, Koichi; Okada, Hajime; Orimo, Satoshi; Pirozhkov, A. S.; Sakaki, Hironao; Sasao, Fumitaka*; Sasao, Hajime; Shimomura, Takuya; Sugiyama, Akira; Suguyama, Hironori*; Tampo, Motonobu; Tanoue, Manabu*; Wakai, Daisuke*; Yogo, Akifumi; Nagatomo, Hideo*; Nemoto, Koshichi*; Oishi, Yuji*; Choi, I. W.*; Lee, J.*

High-intensity laser and mater interactions produce high-energy particles. A proton beam driven by a high-intensity laser has received attention as a compact ion source for medical applications. We have performed the experiment of proton generation from a thin-foil target for developing the laser-driven ion source. We use a Ti:sapphire laser system (J-KAREN) at JAEA. A laser beam focused by an off-axis parabolic mirror on the thin-foil target. The pulse duration of laser is 40 fs (FWHM). We observed the protons at the rear side of the target with a TOF (Time of Flight) proton spectrometer. The maximum proton energy of proton increases by reducing the ASE duration. The maximum proton energy of 7 MeV is obtained with a 2.5 m thick stainless-steel target.