Protons and electrons generated from a 5-m thick copper tape target irradiated by s-, circularly-, and p-polarized 55-fs laser pulses

Li, Z.*; Daido, Hiroyuki; Fukumi, Atsushi*; Bulanov, S. V.; Sagisaka, Akito; Ogura, Koichi; Yogo, Akifumi; Nishiuchi, Mamiko; Orimo, Satoshi; Mori, Michiaki; Oishi, Yuji*; Nayuki, Takuya*; Fujii, Takashi*; Nemoto, Koshichi*; Nakamura, Shu; Noda, Akira*; Choi, I. W.*; Sung, J. H.*; Ko, D.-K.*; Lee, J.*

The energy spectra of energetic protons emitted in the normal direction from a 5-m thick copper tape irradiated by p-, circularly-, and s-polarized 55-fs laser pulses with intensity of 8-910W/cm are measured together with the angular distribution and energy spectra of hot electrons by the target normal direction. The protons with energy up to 1.34 MeV in the rear target normal direction and hot electrons in the laser propagation direction are found. The characters of protons and electrons driven by the circularly-polarized irradiation are close to that driven by the p-polarized one, which is much different from the case at laser intensity of 2-310W/cm.