Abstract

Characteristics of ablation plasma of target produced by the irradiation of an intense pulsed light-ion beam on the solid targets are studied in detail by time-resolved spectroscopic measurement. From the measurement of Stark broadening, we have estimated the electron density to be (1.2 ∼ 1.5) x 1018 cm-3 at 10 mm downstream from the aluminium target irradiated by the ion beam with diode voltage of 720 and 880 kV, and ion-current density of 2 and 3.5 kA/cm2, beam power density of 1.5 and 3 GW/cm2, respectively. Assuming local thermodynamic equilibrium, we have evaluated the electron temperature to be (2.1 ∼ 2.7) eV at 10 mm downstream from the target from the measurement of light intensity ratio of successive ionization stages. The expansion velocity of the ablation plasma has been found to be (2.2 ∼ 2.8) cm/μs.

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