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Fukuda, Yuji
no journal, ,
We present a new approach where high energy ions are generated from the irradiation of a cluster-gas target by a compact ultrashort pulse laser. With this approach, we have demonstrated efficient generation of high energy ions with energies up to 10-20 MeV per nucleon and with a small full-angle divergence of 3.4 degree by irradiating the replenishable cluster-gas target with 40-fs laser pulses of only 150 mJ energy at 1 Hz repetition rate. This corresponds to approximately tenfold improvement of the accelerated ion energy compared to previous experiments with solid targets.
Otobe, Tomohito; Koga, J. K.; Yabana, Kazuhiro*
no journal, ,
We show the simulation for interaction between intense laser field and dielectrics by solving Time-dependent Khon-Sham equation which is the fundamental equation of Time-Dependent density functional theory. As a first step, we show that this approach can describe the dielectric breakdown of diamond. As a next step, we shows the change of the dielectric function after the intense laser field. Furthermore, we found that the angular dependence of electron excitation rate has information about the band structure.