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High-order harmonics from relativistic electron spikes

相対論的電子スパイクから放出される高次高調波

Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; 小倉 浩一; 林 由紀雄; 小瀧 秀行; Ragozin, E. N.*; Neely, D.*; 桐山 博光; 下村 拓也; 田上 学; 中井 善基*; 岡本 征洋*; 鳥本 和弘; 佐藤 智彦; 近藤 修司; 金沢 修平; Koga, J. K.; 福田 祐仁; 錦野 将元; 今園 孝志; 長谷川 登; 河内 哲哉; 大道 博行; 加藤 義章*; Bolton, P.; Bulanov, S. V.; 近藤 公伯

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 we discovered bright off-axis harmonics carrying the pulse energy of up to 50 nJ ($$approx 5 times 10^9$$ photons) in the 60-100 eV spectral region, which is one of the best results achieved with compact coherent X-ray sources. We measured the angular divergence. High-resolution images reveal that the harmonics are emitted from two point-like regions with size smaller than a micron, which was predicted by our relativistic electron spikes model.

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