X-ray spectroscopy diagnoses of clusters surviving under prepulses of ultra-intense femtosecond laser pulse irradiation

超高強度・フェムト秒レーザー照射におけるプリパルスのもとで残存するクラスターのX線分光計測

Faenov, A. Ya.*; Skobelev, I. Yu.*; Pikuz, T.; Pikuz, S. A.*; Fortov, V. E.*; 福田 祐仁; 林 由紀雄; Pirozhkov, A. S.; 小瀧 秀行; 下村 拓也; 桐山 博光; 金沢 修平; 加藤 義章* ; Colgan, J.*; Abdallah, J. Jr.*; 神門 正城; J-KAREN Laser Operation Group

Faenov, A. Ya.*; Skobelev, I. Yu.*; Pikuz, T.; Pikuz, S. A.*; Fortov, V. E.*; Fukuda, Yuji; Hayashi, Yukio; Pirozhkov, A. S.; Kotaki, Hideyuki; Shimomura, Takuya; Kiriyama, Hiromitsu; Kanazawa, Shuhei; Kato, Yoshiaki*; Colgan, J.*; Abdallah, J. Jr.*; Kando, Masaki; J-KAREN Laser Operation Group

It is shown that various spectroscopic methods based on measurements of X-ray spectra radiated from cluster targets can be used for estimation of the destruction degree of clusters by laser prepulses. These methods allow answering the important issue of preservation of the dense cluster core at the moment of the arrival of the main laser pulse. In addition, they can be used for quantitative estimation of the size of the undestroyed parts of the clusters and also for measuring the temperature and density of the preplasmas produced by the laser prepulses.