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Report No.

Source development of novel coherent X-ray and the applications in JAEA

Kawachi, Tetsuya; Sasaki, Akira; Nishikino, Masaharu; Ishino, Masahiko; Hasegawa, Noboru; Imazono, Takashi; Ochi, Yoshihiro; Tanaka, Momoko; Faenov, A. Ya.*; Pikuz, T.; Pirozhkov, A. S.; Esirkepov, T. Z.; Nakamura, Tatsufumi; Kando, Masaki; Bulanov, S. V.; Kondo, Kiminori; Janulewicz, K.*; Kim, C. M.*; Steil, H.*; Suemoto, Toru; Tomita, Takuro*; Namikawa, Kazumichi; Namba, Shinichi*; Yamagiwa, Mitsuru; Kato, Yoshiaki 

This paper reviews recent progress in the X-ray laser research in JAEA. In the source development, the polarization of the 13.9 nm laser has been investigated experimentally. The result indicates that the output beam is strongly polarized in the direction perpendicular to the target surface. In the alternative schemes toward the shorter wavelength region, intense higher-order harmonics with more than 300 eV has been observed from relativistic plasma generated with the laser intensity higher than 1E19 W/cm$$^{2}$$. Furthermore, theoretical investigations of resonantly photo-pumping scheme using intense K-alpha line and generation of $$gamma$$-ray flash induced by radiation damping effect are also studied. In the application study, the surface dynamics of metal plate irradiated by an optical pulse observed by X-ray laser interferometer, surface deformation induced by a single-shot XRL exposure in which nano-scale conical structures are formed, will be reported.



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