Laser-driven proton generation from a thin-foil target

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

High-intensity laser and mater interactions produce high-energy particles, hard X-ray, high-order harmonics, and terahertz (THz) radiation. 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). The estimated peak intensity is 510W/cm. We observed the protons at the rear side of the target with a TOF(Time of Flight) proton spectrometer. The maximum energy of proton is 7 MeV with a 2.5 m thick stainless-steel target.