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Source structure of high-order harmonics from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; Kiriyama, Hiromitsu; Shimomura, Takuya; Tanoue, Manabu; Nakai, Yoshiki*; Okamoto, Masahiro*; Torimoto, Kazuhiro; Sato, Tomohiko; Kondo, Shuji; Kanazawa, Shuhei; Koga, J. K.; Fukuda, Yuji; Nishikino, Masaharu; Imazono, Takashi; Hasegawa, Noboru; Kawachi, Tetsuya; Daido, Hiroyuki; Kato, Yoshiaki* ; Bolton, P.; Bulanov, S. V.; Kondo, Kiminori

In recent experiments with the J-KAREN laser we imaged the source of harmonics with photon energies from 60 to 100 eV onto a LiF crystal detector, which provides sub-$$mu$$m resolution. The images reveal that the harmonics are emitted from two point-like regions with size smaller than a micron, in accordance with the prediction of our relativistic electron spikes model.

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